WO1995028804A1 - A distance learning system providing individual television participation, audio responses, and memory for every student - Google Patents
A distance learning system providing individual television participation, audio responses, and memory for every student Download PDFInfo
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- WO1995028804A1 WO1995028804A1 PCT/US1995/004619 US9504619W WO9528804A1 WO 1995028804 A1 WO1995028804 A1 WO 1995028804A1 US 9504619 W US9504619 W US 9504619W WO 9528804 A1 WO9528804 A1 WO 9528804A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/06—Electrically-operated educational appliances with both visual and audible presentation of the material to be studied
- G09B5/065—Combinations of audio and video presentations, e.g. videotapes, videodiscs, television systems
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/08—Electrically-operated educational appliances providing for individual presentation of information to a plurality of student stations
- G09B5/14—Electrically-operated educational appliances providing for individual presentation of information to a plurality of student stations with provision for individual teacher-student communication
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B7/00—Electrically-operated teaching apparatus or devices working with questions and answers
- G09B7/02—Electrically-operated teaching apparatus or devices working with questions and answers of the type wherein the student is expected to construct an answer to the question which is presented or wherein the machine gives an answer to the question presented by a student
- G09B7/04—Electrically-operated teaching apparatus or devices working with questions and answers of the type wherein the student is expected to construct an answer to the question which is presented or wherein the machine gives an answer to the question presented by a student characterised by modifying the teaching programme in response to a wrong answer, e.g. repeating the question, supplying a further explanation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/38—Arrangements for distribution where lower stations, e.g. receivers, interact with the broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/258—Client or end-user data management, e.g. managing client capabilities, user preferences or demographics, processing of multiple end-users preferences to derive collaborative data
- H04N21/25866—Management of end-user data
- H04N21/25891—Management of end-user data being end-user preferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
- H04N21/4351—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream involving reassembling additional data, e.g. rebuilding an executable program from recovered modules
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/475—End-user interface for inputting end-user data, e.g. personal identification number [PIN], preference data
- H04N21/4758—End-user interface for inputting end-user data, e.g. personal identification number [PIN], preference data for providing answers, e.g. voting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/81—Monomedia components thereof
- H04N21/8166—Monomedia components thereof involving executable data, e.g. software
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8541—Content authoring involving branching, e.g. to different story endings
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/025—Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/04—Systems for the transmission of one television signal, i.e. both picture and sound, by a single carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
- H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
- H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/15—Conference systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
- H04N7/17309—Transmission or handling of upstream communications
- H04N7/17318—Direct or substantially direct transmission and handling of requests
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
- H04H20/30—Arrangements for simultaneous broadcast of plural pieces of information by a single channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/02—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information
- H04H60/07—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/27—Arrangements for recording or accumulating broadcast information or broadcast-related information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
- H04H60/45—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying users
Definitions
- the interactive television program is of a type disclosed in commonly copending U.S. Patent Application Serial No. 07/797,298, filed November 25, 1991, and in U.S. Patent Nos. 4,847,700, 4,507,680, 4,573,072, 3,947,792, 4,602,279, 4,264,925, and 4,264,924, the contents of which are incorporated herein by reference.
- Distance learning systems offer unique opportunities for providing solutions to many of the increased needs of our educational system today.
- Experienced expert teachers can be brought to any classroom in any location to provide high quality instruction.
- Distance learning technology represents an integration of proven technologies that eliminates the social and economic distinctions between different classrooms.
- students in a small school within a depressed area can receive the same quality instruction as that received in more privileged localities.
- Most experts agree that education is the key to the future of our society.
- the classroom suffers from technical neglect and lack of creativity which would enhance the instructor teaching capabilities.
- NTN Interactive System as utilized on the Kentucky Educational Television (KET) network and the Viewer Response System by One Touch Systems. Both of these systems use talkback circuits that link remote sites back to a centralized site, provide a host computer with customized software, site controllers, and simple-to-use keypads for entering student responses.
- the KET system provides battery powered keypads which link back to a site controller via a two way RF link. In other systems, keypads connect to a site controller either by cable or IR datalink.
- the KET keypad includes an LCD display that indicates if the participants got a question right or wrong. The simple right or wrong responses are prestored at the site controller.
- the RF site controller collects responses from up to twelve keypads.
- the instructor's lecture originating at a host site, is broadcast by satellite to either one or several remote site locations. Each participant can respond to multiple-choice questions, TRUE/FALSE questions, etc., by pressing function keys.
- Remote site controllers connect back to the host site computer via dial-up telephone lines or X.25 packet networks. Participant responses are collected electronically by microprocessor based site controllers and transmitted to a centralized data collection center at the host. These systems allow for automatic scoring of examinations, print out of detailed performance reports at the central site, or graphics display of results to the instructor.
- the instructor can call on any viewer, or a viewer may request an explanation from the instructor.
- the ABL system is at the very high end of distance learning systems.
- This system utilizes videoconferencing technology to connect an instructor with students at multiple locations.
- This two-way interactive system provides for full communications of video, voice and data between the students and the instructor.
- Each student in every classroom has a video monitor, personal computer, video camera, microphone and communications link to/from the head-end.
- This system requires a high capacity transmission system such as that provided by DS-3 lines.
- the instructor can open windows on the screen and see and hear individual students. To ask questions, students can raise their hands electronically, to signal the instructor. The instructor can then interact with that student by opening that student's window on the screen. During this time, the other students are passively waiting for the instructor to recommence his or her lecture, or are seeing and hearing the interaction with the selected student.
- the present invention provides each participant in a program an individualized and personalized learning experience.
- Educational television or video is dramatically enhanced in the present invention by making the viewer interactively participate in the program and by providing one-to-one teacher to student instantaneous feedback.
- a novel, exciting kind of distance learning system is created.
- One new aspect of the present invention is the ability to record transmitted interactive programs for later use or more convenient playback.
- recording in current distance learning systems is impossible due to the two-way nature of such systems.
- classrooms with scheduling conflicts or in different time zones can simply record the earlier broadcast and playback the interactive program at a later more convenient time. Recordabllity is possible since the audio and data driving the keypads at the remote sites are embedded in the video signal creating a one-way broadcast technology.
- Teaching by nature is not interactive. For example, in a normal live lecture, a teacher will ask the class a question. Several students may raise their hands to answer the question. One student is selected to answer the question and the teacher responds by providing some feedback to that student. Meanwhile, other students sit passively and inattentively by without receiving any feedback to their own correct or incorrect answer choices.
- the present invention solves this problem and goes far beyond the level of interaction provided by the other distance learning systems described above.
- the distinguishing aspect of the present invention is that no longer is one-to-one interaction between a teacher and each student an impossibility in large classrooms. Complete student interaction is now possible and passive viewing is eliminated from the distance learning system classroom.
- the educational interactive power of the present invention is enormous.
- each and every student responds to the question, and each student immediately receives a meaningful and substantive audio response in the instructor's own voice.
- an instructor's lecture can be broadcast to multiple classrooms across the nation. Each classroom may contain a few or literally hundreds of students. All of the students watch a common video of the instructor delivering his or her lesson.
- each student When a question is posed to the students from either the instructor or presentation of a graphics interrogatory message with correct and incorrect answers overlaid onto the video, each student responds by selecting an input or entering a value on a keypad corresponding to an answer choice to the question. Almost immediately after making the selection, it is possible for the student to hear a distinct and substantive audio response to the student's own answer selection. This response is different from the audio responses many other students are hearing at the same time. In this manner, personalized audio feedback is provided to each and every student.
- a major aspect of this invention is the individualization of audio response. Each student receives a personalized audio response to the student's keypad selection.
- the audio response is normally a prepared prerecorded audio response recorded in the teacher's own voice pertaining to a particular answer choice.
- the audio response is preferably composed of one or more prerecorded audio tracks linked together uniquely at each student's headphones to form a complete personalized message in the instructor's own voice.
- the response can be directed to the student's current incorrect or correct answer selection, or may be based on several previous student selections through the provision of memory and logic in the system.
- Multiple audio responses forming the set of suitable responses to an interrogatory message are preferably sent as part of a standard video signal.
- the set of individual audio responses can be increased further by earlier preloading of additional responses in memory at the remote sites, as explained below.
- this powerful educational interactive capability is extremely cost effective and inexpensive.
- individualization of a video program with audio to the magnitude of the present invention could only be done with CDI or laser disc players.
- Such systems would require at least a disc player and monitor with processor for every student, making such a system very expensive and unaffordable to many school districts around the country.
- these systems require computer program expertise to create the interactive programs, further significantly increasing the costs.
- the present invention is inexpensive because it is compatible with existing broadcast systems, program pre-production is simple and affordable, only one television set is required at each remote site, and each student interacts completely and uniquely with the interactive program simply through the use of a low cost keypad and headphones connected to a site controller.
- the provision of interactivity via multiple audio channels allows existing systems to be used.
- the present invention can be easily added to the existing transmission infrastructure, i.e. programming is preferably provided on a single NTSC signal and can be transmitted to receive sites using satellite, cable or television broadcast. Costs are further reduced, in comparison with existing distance learning systems, since the interactive program broadcast can be recorded with the taped or CD version retaining all the interactive elements. Therefore, the value of the present invention is the capability to reduce the social and economic distinctions between different classrooms across the country. Economically depressed school districts can afford the technology of the present invention.
- the claimed distance learning system comprises the broadcast of an interactive distance learning program preferably through provision of one video signal with a plurality, two or more, of related embedded audio signals from a teacher control unit to multiple remote site locations, permitting each participant to interact differently with the television presentation and receive different responsive audio segments.
- Depressing a button on the keypad provides input to a processor which triggers unique algorithmic codes which produces a unique and individual message from a plurality of audio segments transmitted and those prestored at the classroom master unit or other central location.
- participants interact with the interactive program via a subscriber interface.
- the subscriber interface is a keypad with attached headphones.
- the interactive video program is prepared at the teacher control unit, or host site.
- the teacher control unit allows the teacher to create and introduce interactive elements during the live broadcast.
- Program authoring software on the instructor's personal computer allows the scripting of presentation aids off-line.
- the presentation aids including Preformatted questions, are available to assist the instructor during broadcast.
- the presentation aids are easy to design and edit using customized software.
- the instructor creates a graphic slide on the computer comprising a question and possible answers.
- the instructor records in the instructor's own voice a verbal explanation for each of the answer choices thereby creating separate audio tracks.
- the instructor also records some standard messages that will be automatically combined with the audio answer response segments to form stacked compounded messages, at appropriate times.
- the software automatically formats the text into visually pleasing graphics and associates the multiple audio tracks corresponding to the instructor's verbal responses with the particular graphics segment.
- the graphics and related audio tracks are preferably stored in a relational database with pointers establishing the relationship between the graphics and audio elements. Preparation of the interactive program preferably occurs prior to broadcast.
- the students watch on a television monitor a live or prerecorded video of the instructor teaching the lesson.
- the instructor at an appropriate time during the lesson, preferably clicks on the PICON designated on the computer screen.
- the graphics slide is transmitted as video to the remote sites.
- the students view the graphics slide on a television at the remote site while the teacher talks over the slide and explains the question.
- the teacher requests the students to answer the question, e.g. "OK, everyone please answer the question now.”
- a plurality of related audio messages are embedded in the video signal and transmitted to the remote classroom sites.
- the student selects an answer by depressing a button on the keypad and the system responds to each student with an appropriate audio response.
- Stacking is a process wherein audio feedback response options are expanded beyond the available number of channels available by linking a combination of individual audio segments separated in time in an appropriate fashion. For example, six possible audio responses can be provided with only four channels.
- more than the four simultaneously transmitted audio response segments can be provided to the remote devices by preloading memory at the classroom master unit or at some other central location. Additional audio tracks can be sent at earlier points in time, preloaded into storage at the classroom site, later aligned with the live audio tracks in time, and presented simultaneously to the keypads. In this manner, a large library of related audio responses can be formed to enhance the individualized instruction to the student.
- the graphics video is output from the instructor's personal computer to a video mixer. Additional inputs to the video mixer may include the video of the instructor and VCR or CD prerecorded video.
- the video mixer outputs a single video signal.
- the plurality of audio signals is combined with the single video signal along with interactive data codes in an inserter to form a single NTSC compatible video signal.
- the audio channels and data are inserted in the vertical blanking interval (VBI) of the video signal.
- the audio channels, data and video signal can be digitally encoded and time division multiplexed into a single composite digital interactive signal.
- the signal passes to a multi-channel audio extractor.
- the extractor essentially reverses the process by which the audio and data signals were inserted into the video signal.
- the extractor is one element of the classroom master unit which also includes a controller (with associated memory), and data and voice interfaces.
- the classroom master unit provides for the site setup, contains software for scoring students, automatically creates customized printouts, handles remote diagnostics, and also provides an interface for return circuits to the teacher control unit at the headend.
- the classroom master unit preferably collects student responses electronically both after each question during the interactive program, prepares, class performance summary reports after the program, and transmits this data back to the teacher control unit.
- each student in a distance learning classroom watches one or more television monitors at the front of the classroom in which a live broadcast or prerecorded program is displayed to the students.
- Each student uses a simple keypad and a pair of low-cost headphones to respond to questions that are displayed onto the monitor.
- the participants are asked to enter responses on the keypad.
- Interrogatory messages can be displayed in the graphics video.
- each participant selects a key corresponding to his or her choice.
- each viewer hears a personalized response, comprising one or more audio segments, in the instructor's own voice via the headphones.
- the audio response is directly related to the answer choice selected by the student.
- the system discloses a branching capability which, based on user selection, will branch to particular audio responses.
- the branch for each student may be different depending on the student's response(s).
- the branching is preferably performed in the keypad.
- a branching algorithm via branch codes, is downloaded from the teacher control unit to the classroom master unit and forwarded to the keypad processor.
- the master unit could be at a central location in the school or cable system headend or its function could easily be built into a set top box.
- the keypad processor stores the algorithm in associated RAM memory.
- the processor uses the algorithm to determine the proper channel to switch to according to the user selection. In this manner, each and every student in a classroom, which may contain anywhere from a few to hundreds of students, receives an individualized response to each question.
- the distance learning system also has the advantage of remembering student responses and using these responses in choosing an audio response to present to the student.
- Memory branching is a technique of the present invention where an algorithm assembles audio responses according to the current and previous user inputs. Memory branching is accomplished by linking audio message segments together in a logical relationship.
- the keypad processor contains logic (preferably, in the software algorithm) and memory to store previous responses and to process these previous responses in the algorithm to control future audio channel selection.
- Student responses are optionally sent from the classroom master unit back to the teacher control system via return paths.
- the return paths can be dial-up telephone lines or X.25 packet switched network, or other communications means.
- the host computer at the teacher control unit receives student performance data, processes the data, displays the data in chart or graph form to the instructor so as to provide immediate feedback to the instructor on student performance.
- the instructor can use such feedback to focus attention on a particular class or particular student.
- Feedback return paths can also be established after the interactive session for receiving student data to generate report cards.
- the present invention does not require further feedback return paths to the teacher control unit.
- a primary objective of this invention is providing an enhanced interactive program so that everyone in the audience can equally participate and interact in real time using a cost effective and easy to use system.
- Figure 1 is a diagrammatic representation of the distance learning system displaying various elements of the system.
- Figure 2 is a block diagram of the components of the teacher control unit located at the headend of the distance learning system.
- Figure 3 is a diagram showing the hardware elements of the preferred analog transmission embodiment at the headend comprising an inserter for embedding four audio circuits and data commands into a single video signal.
- Figure 4 is a block diagram showing the hardware elements of a digital transmission embodiment comprising digital encoder/compressor configurations and a digital multiplexer.
- Figure 5 is a block diagram of the components of the classroom master unit resident at each remote classroom location.
- Figure 6 is a detailed schematic of the hardware elements of the preferred analog embodiment four-channel VBI extractor.
- Figures 7(a) and 7(b) are block diagrams of the digital transmission components at the receive locations comprising a digital decoder/demultiplexer configuration and NTSC inserter, respectively.
- Figure 8 is a diagram of the components of the subscriber keypad and connecting headset configuration.
- Figure 9 is an example representation of a graphics interrogatory message displayed on the video monitor at each of the classroom locations.
- Figure 10 is an example representation of a graphics answer slide corresponding to the graphics interrogatory message in Figure 9.
- the present invention is a direct learning system (98) for enabling a complete interactive television program to be transmitted or recorded as a single NTSC compatible television signal and be received at multiple classroom locations to provide students with interactive and individualized learning experiences.
- the interactive television programming used herein preferably comprises a single video signal with a plurality of audio signals, preferably four or more, which are related in time and content to one another. The interaction with the students comes via the plurality of audio channels. Audio segments are used to provide personalized responses to student selections.
- the interactive television program may also comprise data for controlling an interactive television program controller (178) at the classroom location.
- the system uses an interactive program delivery system (98) with any video transmission means including satellite (150), cable (138) or broadcast television (142) to deliver the interactive program for distribution to the multiple classroom sites.
- distribution of the signal at the receive end can be by any suitable transmission means (166) including a cable distribution system, fiber optic, microwave, etc.
- the system generally includes: a teacher control unit (100) where a video signal, audio channels and control codes are preferably created and assembled into a standard NTSC compatible video signal; a broadcast transmission system comprising transmission equipment for transmitting the interactive video signal by any suitable broadcast transmission means and receive equipment for distribution to multiple classroom sites; the multiple classroom sites comprising a classroom master unit (170) and connected keypads (194) for receiving the audio channels; and a television monitor (186) for displaying the video signal.
- a teacher control unit 100
- a broadcast transmission system comprising transmission equipment for transmitting the interactive video signal by any suitable broadcast transmission means and receive equipment for distribution to multiple classroom sites
- the multiple classroom sites comprising a classroom master unit (170) and connected keypads (194) for receiving the audio channels
- a television monitor (186) for displaying the video signal.
- the teacher control unit (100) Is at the centralized location, or host, which comprises a studio for live video broadcast of an instructor's presentation.
- the instructor utilizes a personal computer (114) to create interactive programming consisting of graphics interrogatory messages (480) with correct and incorrect answers (484) overlaid on the video, a plurality of audio tracks recorded in the instructor's own voice corresponding to correct and incorrect answer choices of the interrogatory messages, and data codes necessary for controlling the interactive program elements.
- the audio tracks and data codes are inserted into the vertical blanking interval of the video signal for transmission.
- the plurality of audio tracks, data codes and video signal are digitized and combined into a composite digital signal, as described below.
- the teacher control unit (100) comprises a host personal computer (134) that tallies student responses received from the classroom sites and can immediately project the evaluation results onto a monitor (202) for the instructor.
- An administrative computer (122) communicates with the remote sites for student response data and performs system diagnostic checking.
- the interactive broadcast program is prepared at the teacher control unit (100).
- the teacher control unit (100) allows a teacher to create and introduce interactive elements during a live broadcast.
- the cameras (104) are focused on the instructor.
- the camera's outputs are directed to a video switch (108) that also receives video inputs from the instructor's personal computer (114) and from a standard VCR or CD (210).
- the teacher pre -records all of the right answers and wrong answers, as well as standard messages, into the personal computer (114) before the program begins.
- the program then starts and the teacher presents his or her material live.
- the teacher picks a question, as described below, and pre-recorded audio responses, which may be composed of a single or combination of multiple audio tracks (live or prestored), can be presented as a function of student selection.
- a distance learning presentation can be created live with two teachers. Each teacher switches back and forth while presenting their material, then both share in posing questions to the students. The two teachers can alternate giving either the audio branch for a correct answer, or the audio branch for the wrong answer.
- the two separate audio branches are transferred simultaneously into the voice mixer (118). When the teachers give the branches, each teacher must be in a separate sound proof area so that one teacher's audio does not "bleed" into the other teacher's audio.
- primary preparation of the question- and-answer portion of the interactive program preferably occurs off-line on the instructor's computer (114).
- the instructor's computer (114), shown in Figure 2 is preferably a multimedia personal computer which could be a Macintosh, Sun, IBM, Power PC, or compatible, computer.
- the Program creation software on the instructor's personal computer (114) allows the scripting of presentation aids.
- the scripted presentation aids are stored in files in ROM in the instructor's computer (114).
- the presentation aids are available to assist the instructor during broadcast.
- Presentation aids may include instructor agenda lists and formatted questions, previously prepared, that can be viewed by the audience.
- the formatted questions may include multiple choice questions, TRUE/FALSE questions, YES/NO questions, direct value entry, and the like, that are broadcast as part of the interactive video signal.
- the instructor creates graphic slides of questions on the computer (114) using the text editor. Associated with each question, the instructor enters a number of possible participant options for answering the questions. The instructor records into a microphone (112) a verbal explanation for each of the possible answer choices. These audio responses can later be combined with an appended standard response at the handsets (194). The instructor should keep each of the four audio responses near the same length in time. This will avoid the possibility of dead time after an audio response is played to the student since the branch back to the lecture audio (channel one) preferably will occur simultaneously in all remotes (194).
- the software automatically formats the text into visually pleasing television graphics and associates the multiple audio tracks corresponding to the instructor's verbal responses with the particular graphics segment.
- Each graphics question and the corresponding audio responses are preferably stored in a relational database.
- the multiple audio response segments are stored in separate files.
- the graphics element, multiple audio tracks ready for broadcast, and data codes are preferably related to one another in the relational database by pointers.
- the process for creating the graphics interactive program files, described above, is repeated for each interrogatory message thereby creating a database of related files.
- the file is preferably represented to the instructor via the computer monitor (116) in the form of a PICON.
- a PICON is a picture icon which represents a file.
- the instructor can view an entire set of relevant PICONS on the display monitor (116) while proceeding with a lecture.
- the teacher can click on or touch a PICON which first sends and displays the graphics and then at the appropriate time effectuates the transmission to the audience of the four audio response tracks.
- the audio is sent when the instructor enters a command which is received by the processor and the four appropriate audio responses are retrieved from memory and are input into one of four ASIC chips. At the appropriate time, the audio is read from the instructor's computer and is transported to the audio mixer (118).
- a pre-recorded interactive distance learning program can also be accomplished easily with the present invention.
- the interactive program can be created like any television program. It can be developed in whatever format is available, tape or disk, analog or digital, including but not limited to: one inch, Dl, D2, Betacam, Betacam SP, Hi- 8, three-quarter, S-VHS, or any other format.
- the interactive program used in the present invention preferably comprises a single video with a plurality of audio signals embedded therein to achieve interactivity.
- the video switch (108). shown in Figure 2, selects video from either the graphics video received from the instructor's computer (114), the live broadcast video received from the cameras (104), recorded video from a VCR (210), or a graphic from the computer keyed over another video.
- the video switch selection depends on the particular command instructions received from the computer processor. If the instructor is broadcasting a live lecture to the classrooms, the processor will send a command to the switch (108) to output the camera-based video.
- the instructor may send a digital signal from the instructor's computer to the remote terminal instructing the terminal to overlay generated text onto the video.
- a command is sent from the processor to the switch (108) to switch from the live broadcast video to graphics video.
- a pre-recorded interactive video program could be sent from a VCR (210) for subsequent output selection by the video switch (108).
- Timing and control between the video and multiple audio elements are provided through the use of data codes.
- the data codes are stored in memory in the instructor's personal computer (114) as part of the ACTV programming language.
- the codes comprise commands, or branch codes, for branching between channels (as discussed in the aforementioned ACTV patents and applications), timing signals for controlling the interactive program, data or text, commands for termination and initiation of interactive programming viewing, or triggers for executing macros.
- the data codes are output from the computer (114) to the inserter (214), shown in Figure 2.
- the output of the video switch 108 then passes to the inserter (214) to be combined with the data codes and multiple audio channels.
- the audio channels are fed from the instructor's personal computer (114) into an audio mixer (118).
- the audio channels can be compressed, expanded and/or limited to achieve a higher signal-to-noise (S/N) ratio at the receiver (158).
- S/N signal-to-noise
- This processing can be utilized to align the different audio response tracks in time.
- the audio mixer (118) also has the capability of receiving, via an interface (126) with the telephone system, return audio from the participants in the classroom locations.
- VCR audio output is received by the audio mixer (118).
- the audio mixer (118) preferably outputs four audio channels; however, the present invention can accommodate any other number of audio channels.
- the analog inserter (214) of the preferred embodiment is shown in more detail in Figure 3.
- the four audio output channels are fed into the inserter (214) to be mixed with the video and data.
- Each audio signal is preferably an analog signal which varies between -1.0 and +1.0V.
- a buffer (222) is provided for each audio signal to electrically isolate the audio inserter (214) from the source of the audio signals.
- the buffer (222) preferably comprises an RC circuit which feeds an operational amplifier.
- the amplifier in the buffer (222) preferably raises the absolute voltage level of the audio signal by +1 volt so that the audio signal will have a range from OV to +2V, and then amplifies the audio signal so that its range is from OV to +5V.
- each buffer (222) is directed to a bank of low pass filters (226), one for each audio signal.
- the low pass filter (226) clips the audio signal to a desired frequency. The frequency to which the input is clipped depends on the number of lines of video the particular audio channel is to occupy.
- the filtered audio output signals of the low pass filters (226) are directed as inputs to a multiplexer (230).
- the multiplexer (230) is preferably a conventional four-input one-output multiplexer (230) which is controlled by timing signals received from the timing circuit (254).
- the timing circuit (254) is synchronized with the video signal of the interactive program and controls the multiplexer (230) to sequentially take a sample from each audio signal and to direct the sample to an analog-to-digital (A/D) converter (234).
- the A/D converter 234 converts the samples of the four audio signals to an 8-bit digital format.
- each of the four audio channels preferably has an associated first-in first-out (FIFO) pair (238, 242).
- the 8-bit digital samples for each signal are directed as an input to one of the FIFO pair (238, 242) associated with that signal.
- the samples for each channel are preferably directed to one of the FIFO pair (238, 242) for that channel until enough samples are in that FIFO to fill the desired number of lines of the video field into which the sampled audio is to be inserted.
- the audio samples are then directed to the other FIFO of the FIFO pair (238, 242) for that channel until that FIFO has the correct number of samples. In the meantime, the contents of the first FIFO are written onto the video signal. It is foreseen that other types of memory means may replace the FIFO pair (238, 242).
- the digitized audio samples stored in that FIFO are directed (first- in-first-out) to a digital-to-analog (D/A) converter (246), as shown in Figure 3.
- the D/A converter (246) converts the stream of digitized audio samples into an analog PAM (pulse amplitude modulated) signal.
- a second buffer (250) is provided for electrically isolating the inserter circuit from the switching circuitry (258) which multiplexes the audio signals into the video signal.
- the audio signals A and B are each inserted independently onto 5 lines of one field of the video signal, and audio signals C and D are inserted independently onto 5 lines of the other field of the video signal.
- the audio for each channel must be compressed so that 5 lines of video per frame contain enough audio content for the playback time of one frame of video (about l/30th of a second).
- the number of samples of audio required for each channel depends upon the desired sound quality. If lower sound quality is desired, fewer lines of video may be used, and vice versa.
- the multiplexor (230) sequentially samples each audio signal 15,734 times per second and alternatively directs 525 samples to each of the FIFO's (238, 242) associated with each audio channel.
- the timing circuit (254) shown in Figure 3, instructs the full first-in first-out FIFO for the channel to write the digital audio to the D/A converter (246) which converts it to a pulse amplitude modulation (PAM) signal.
- PAM pulse amplitude modulation
- the timing circuit (254) then switches the video selector (258) to receive the PAM audio signal through the buffer (250) as an input in lieu of the video signal. In this manner, the audio channels are inserted into the video. Once the audio has been inserted into the video at the desired location, the timing circuit (254) commands the video select switch (258) to change its input back to the video signal. This process is repeated for each audio signal at the video lines that audio signal is to be inserted into the video signal. Typically, ten lines of the Vertical Blanking Interval (VBI) of the video signal are available for use in each field of video.
- VBI Vertical Blanking Interval
- audio signals A and B are each inserted as five lines of the VBI of one field
- audio signals C and D are each inserted as five lines of the VBI of the other field.
- data is preferably sent on line 21 of the vertical blanking interval (VBI) using the predefined standard for transmitting data on line 21.
- the line 21 data is preferably sent as 16 bits of serial data per field, and is placed into the video signal using a standard line 21 encoder. However, the data can alternatively be inserted into other lines of the video.
- Classroom site codes are preferably placed in line 22 and would similarly preferably be sent as 16 bits of serial data per field.
- the PAM samples may also be randomly dispersed within the video frames.
- a control algorithm distributes the random PAM samples in the video using a rule of distribution.
- the rule of distribution minimizes any degradation in the perceived quality of the video. For example, it is not desirable for the samples to be too closely grouped together, especially in successive fields of frames.
- a header may be placed on the random audio samples to enable the audio extraction system (174) to identify the audio samples.
- the audio signals may be inserted over lines of active video, for example, at the top and bottom of each field. Fewer video lines may be used if lower quality audio is desired, or more lines used if additional audio channels are desired.
- An audio signal may be transmitted over each of the normal audio channels.
- the audio may be distributed in many ways using the available audio channels. For example, high quality background music for the interactive program could be transmitted over the normal audio channel. Then, lower quality audio for voice-overs could be inserted onto the video signal and/or using the secondary audio program (SAP) signal. This would enable a larger number of audio signals to be transmitted with the interactive program.
- the audio channels could also simply be combined with the video and data signals via a frequency division multiplexer.
- the audio channels can be digitized using any common analog-to-digital conversion technique such as PCM, DM, ADPCM, etc.
- vocoders e.g., LPC, APC, channel vocoders
- the present invention may be used to facilitate the transmission of multiple audio channels.
- the channels are all sent as one audio signal using serial sequencing.
- Serial sequencing is defined by reading the audio tracks from memory serially in sequence (i.e., Al, then A2, then A3, etc.).
- the resulting signal is then sent as a secondary channel, or SAP channel, with the primary channel containing the regular audio of the live instructor's voice.
- SAP channel secondary channel
- these particular audio tracks would have to be sent prior to the time when the answers are scheduled to be played to the students. Therefore, when the SAP channel is received at the classroom master unit or unit in the home (170), the signals will be independently decoded from the SAP channel, buffered and stored in memory (284) for later use when it is appropriate to playback the answers to the students.
- the distance learning system of the present invention can provide for transmission of the interactive signal by digital transmission means, resulting in reduced bandwidth requirements.
- the interactive signal can be transmitted by not only satellite but ATM, Sonet, Tl or any other digital transmission system.
- the digital transmission components at the teacher control unit (100) are shown in Figure 4.
- the plurality of audio signals are output from the instructor's personal computer (114) and mixed in the audio mixer (118) with the live instructor's audio and VCR audio, preferably resulting in four output channels.
- the audio signals are then preferably sampled, encoded and compressed in the audio digital encoder/compressor (500).
- the encoding technique can be a waveform coding technique such as PCM, ADPCM or DM.
- the signals can be encoded using synthesizer or vocoder techniques such as MUSICAM, Linear Predictive Coding (LPC), Adaptive Predictive Coding (APC), and Sub-band coding.
- a single composite audio signal is output from the audio digital encoder/compressor (500).
- the video signals from the cameras (104), graphics video from the instructor's personal computer (114), and video from the VCR (210) are input into the video switch (108) which outputs one of the video signals.
- the video digital encoder/compressor (504) takes the video signal, encodes and compresses the signal according to a known standard such as MPEG-1, MPEG-2, JPEG, or other DCT based coding scheme, wavelets, fractals or other transform based approaches.
- the video digital encoder/ compressor (504), shown in Figure 4 could utilize a waveform based technique, such as PCM, ADPCM, or DM, for encoding and compressing the video signal.
- the data from the Instructor's personal computer (114), in Figure 4 is preferably compressed in a board in the computer (114) and delivered directly to the digital multiplexer (508).
- the digitized data, video and audio signals are delivered to the digital multiplexer (508) where the signals are buffered and combined via time division multiplexing, with appropriate synchronization signals applied, to form a composite sync serial data stream.
- FEC forward error correction
- the code depending on the selected transmission path is applied by an FEC encoder (512).
- the composite interactive digital signal is then transmitted to the receivers (158) using a suitable transmission means such as satellite, fiber optic, DS, etc.
- the administrative personal computer (122) preferably polls remote sites for student response data, and includes software for performing diagnostic checking on the system. Special polling software is loaded into the administrative computer (122) for performing the polling functions. While in the preferred embodiment the administrative computer (122) polls the classroom master units (170) for student response data, the invention also alternatively allows for the classroom master units (170) to send back data at periodic times without the requirement of a polling command from the head-end administrative computer (122). In addition, the administrative computer (122) transmits site/user authorization, or billing codes, to all the classroom master units (170).
- the host computer (134) receives the student response data, processes the data and displays the processed data on a monitor (202).
- the computer (134) contains software for processing the student responses including tallying responses, grouping scores by class, determining percentage of questions correct, etc.
- the software is capable of organizing data in bar graph or chart form. These graphs and charts can be displayed on a monitor (202) to the instructor so that the instructor can use such information for assessing student and classroom site performance.
- the host and administrative computers (134, 122) preferably use Intel 486 based processors.
- Student response data and other data from the remote classroom master units (170) is preferably received by the host computer (134) from telco answering units (128) if the PSTN is used for return information.
- the telco answering units (128) can manage a multiple number of incoming calls at once.
- the telco answering units (128) route audio to the audio mixer (118), student response data to the host computer (134), with control and diagnostic data directed to the administrative computer (122). While in the preferred embodiment the respective functions of program preparation, diagnostic checking, polling and site authorization, and receipt and processing of student response data are performed on separate computers, the functions could be combined and performed on one or two computers.
- Administrative computer (122) messages are transmitted to the classroom locations after being multiplexed with the interactive video signal in the teacher control unit multiplexer (218).
- the administrative data could be inserted into the video signal using the inserter (214) in the preferred embodiment or multiplexed into the composite digital stream in the digital embodiment.
- the teacher control unit (100) creates and transmits an interactive video signal by taking video from cameras (104), graphics from the instructor's computer (114), or prerecorded video from a VCR (210), inserting multiple audio channels and data codes, and transmitting the resulting interactive video signal to the transmission system.
- the teacher control unit (100) also retrieves student performance and administrative information from the remote classroom sites for aiding the instructor.
- the system uses an interactive program delivery system (98) with any video transmission means including satellite (150), cable (138) or broadcast television (142) to deliver the interactive program for distribution to the multiple classroom sites.
- distribution of the signal at the receive end can be by any suitable transmission means (166) including a cable distribution system, fiber optic, etc.
- the interactive video signal is transmitted to uplink equipment (146) where it may be multiplexed, upconverted, modulated, amplified and transmitted by satellite (150) to a receiver site (154) for distribution to the classroom locations.
- the interactive video signal enters an analog receiver (158) and then preferably a distribution system (166) that directs the signal to classroom locations.
- the composite digital interactive signal enters a receiver (158) where it is demodulated and then preferably passed to a digital cable distribution system that directs the signal to the classroom locations.
- a cable distribution system (166) is the preferred transmission media to the remote sites
- the interactive video signal may also be distributed by any conventionally known technique, such as DBS, fiberoptics, low or high power broadcast television, telephone lines, cellular networks, and similar technology can be used interchangeably with this program delivery system.
- the interactive video signal could also be recorded on tape at the teacher control unit (100) and played back at the classroom sites.
- the classroom master unit (170) comprises an extractor (174), a controller (178) with associated memory (284), VCR (optional) (294), modem (312), interfaces to a printer (302) and return paths (308, 316) back to the headend, and an interface (280) for the subscriber handsets (194).
- the signal is demodulated and passes to a multichannel audio VBI extractor (174), as shown in Figure 6.
- the audio and data is stripped out of the baseband signal in the four-channel VBI extractor (174).
- the signal separator (174) essentially reverses the process by which the audio and data signals were inserted into the video signal.
- a video digitizing system and timing controller (320) digitizes the incoming video signal at the same sampling rate at which the PAM audio samples were inserted into the video signal. While the system (174) preferably digitizes the entire video signal and extracts only the audio signals from the digitized video, it may be preferred to only digitize those lines of the video signal which contain the audio signals.
- the timing controller (320), shown in Figure 6, determines which lines of video contain the audio signals and separates the compressed audio signals by directing each audio channel into an associated FIFO pair (328-356). As with the insertion circuit, the FIFO's in the FIFO pairs (328-356) are used alternately so that while one FIFO is reading the audio data, the other Is writing data.
- the digital-to-analog (D/A) converter (360) sequentially reads from the FIFO for each channel which is in the write mode and converts the digital signal for that channel into an audio signal.
- the analog output for each channel is filtered by filters (364-376) and directed to buffers (380-392).
- the buffers (380-392) preferably adjust and amplify the analog output signals to -IV to +1V range.
- the four output audio signals correspond with the four audio input channels.
- the line 21 data is read into 8-bit shift registers (400) wherein the 16 bits of serial data are converted to two bytes of data.
- the line 22 data is read by 8-bit shift registers (402) and the 16 bits of serial data are also converted to two bytes of data.
- the line 21 and 22 data i.e., the data codes
- the master unit controller (178) decodes the data and stores it in either RAM 286 or FLASH memory (282).
- the composite digital signal is received where the forward error correction (FEC) code is decoded by an FEC decoder (516), as shown in Figure 7a.
- FEC forward error correction
- the resulting signal is forwarded to a digital demultiplexer (520) where the audio, data and video components are separated and individually buffered in a set of buffers (524-532).
- a digital demultiplexer 520
- the composite digital audio signal enters a digital-to-analog converter (536) where the four audio signals are separated, decoded and decompressed to recreate the four separate analog audio channels.
- the digital video signal similarly enters a digital-to-analog converter (540) where the signal is decompressed and decoded to form an analog video signal.
- the data is similarly decompressed and decoded in analog-to digital decoder C (544).
- the demultiplexer configuration (538) is located at the same site as the classroom master unit (170), the plurality of analog audio channels, data and video signal are preferably connected to the master unit (170) by direct wire cable.
- the plurality of audio signals, data and video signal simply bypass the 4 channel VBI extractor (174), shown in Figure 5, and are forwarded to the keypads (194), controller (178) and monitor (186). respectively.
- the four audio signals and data signals are embedded into the video signal in the inserter (548), shown in Figure 7b, to form a standard NTSC interactive video signal.
- This inserter (548) is physically and functionally identical to the inserter (214) used in the analog embodiment at the head-end.
- the embedded signal is then sent from the output of the inserter (548) to the 4 channel VBI extractor (174) shown in Figure 5.
- the functions of the master unit and/or keypad can be incorporated into one digital set top converter box using existing hardware and software and ACTV program codes.
- the user interfaces with the converter using the converter remote control.
- the converter digital circuitry selects from the incoming digital audio streams the appropriate audio channel and delivers it to either the television speaker or attached headphones.
- the master unit processor (178), as shown in Figure 5, receives data from the VBI extractor (174), stores data and reads instructions from FLASH (282), SRAM (286) and Battery backup RAM (290) memory, sends instructions and receives response data from the keypads (194) via the RS-485 transceiver (262), interfaces to a printer via a parallel printer port (302), and interfaces with return paths via a telco interface (308).
- the processor (178) also preferably interfaces with a power module (310) going to a wall transformer. It connects to the teacher control unit (100) at the head end via either dial-up telephone lines or passes data back and forth via a public X.25 packet network.
- the processor (178) is preferably a 80C188 based microcontroller, but can be any similar controller.
- the classroom master unit processor (178) functions as a site controller.
- the processor (178) provides for site setup, drives software for scoring students, transmits commands to keypads (194), transmits/receives data from keypads (194), and handles remote diagnostics.
- System setup and polling functions are controlled by instructions sent in the data from the headend (100) and received by the controller (178).
- the instructions may be stored in one of three portions of memory (284). If the instructions are used frequently and over a long period of time, long term memory such as FLASH (282) memory is preferably used. If the instruction commands pertain solely to the current interactive program received at the site, these commands are preferably stored in SRAM (286) or the battery backup RAM (290).
- the functions of the classroom master unit can be incorporated into the cable headend, school headend or set top converter box.
- the program data codes generated by the teacher control unit (100) are necessary for presenting the interactive program.
- the data includes branch codes containing branching commands and algorithms, timing signals for controlling the interactive program, management and administrative data, and also triggers for executing macros at the master unit processor (178).
- the classroom master unit (170) sites are instructed how to link to the headend (100).
- the administrative computer (122) transmits commands which provide for interactive program setup and for establishing return paths to the headend (100). These instructions are preferably stored in the battery backup RAM (290) associated with the classroom master unit controller (178).
- the parameters instruct the remote sites how to access the public switch telephone network, Internet, or any similar network for access back to the headend (100).
- the operating system for the controller (178) is preferably stored in FLASH memory (282).
- the FLASH memory (282), as shown in Figure 5, also preferably stores new instructions from the headend teacher control unit (100) to use with reprogrammable software. It works in conjunction with RAM (286) and battery backup RAM (290).
- the battery backup RAM (290) preferably saves the configurations, the authorizations from the teacher control system (100), and other information transmitted on line 22 of the video signal.
- the battery backup RAM (290) can also be used as an interface to a print buffer.
- the print buffer is used so that data transmissions to the site can be buffered, error corrected and formatted for printing. Data transmission can include newsletters, course related materials and schedule updates.
- the site controller (178) can be connected to an on-screen display chip (700) which overlays the Incoming video with video characters received from the teacher control unit or site setup, diagnostics, etc.
- the site controller (178) is preferably connected to a printer via the parallel printer port (302).
- the controller (178) sends student scores to the printer.
- Voice communications back to the teacher control unit (100) can occur by way of the talk-back phone (190), which is interfaced to the public switch telephone network via the telco interface unit (308), as shown in Figure 5.
- a remote diagnostic system (296), shown in Figure 5, at the classroom master unit (170) allows for remote turn-on and turn-off of television monitor (s) (186) and also includes an indication of the status of the television monitor(s) (186).
- the classroom master unit (170) connects with the keypads (194) either by cable (404) in a daisy chain configuration or by infrared (IF) connection. As shown in Figure 5, the classroom master unit (170) forwards the four audio channels and sends/receives data to and from the keypads (194) via an RS 485 T/R device (262).
- the site controller (178) sends to the remote processors (460) the setup commands and interactive branching commands and algorithms, as described below. Therefore, code interpretation is preferably accomplished by the master unit processor (178), while switching is preferably performed by a remote processor (460) in each keypad (194).
- the site controller (178) collects student responses from the keypads (194).
- the master unit although preferably located in each classroom, can also be located at home or in one central location.
- each student interacts with the system via a subscriber interface (194), shown in Figure 8.
- each participant uses a keypad (194), with processor (460), and a pair of headphones (198) to respond to questions presented on the monitor (186).
- the keypad (194) preferably comprises four function keys (412, 416, 420, 424).
- the present invention can accommodate any number of labelled or unlabelled keys including keys labelled 0-10, "YES” and “NO” labeUed keys, and "TRUE” and “FALSE” labelled keys.
- the invention can also accommodate an LCD panel for receiving messages and confirming answers.
- the keypad device (194) provides direct program access for the participant.
- the classroom master unit processor (178) issues a unique ID code (e.g. Social Security number) for each participant.
- the keypad (194) allows input of a multiple digit entry for identification.
- the processor (178) preferably checks each participant ID code entry against a list stored in memory (284). If the entered ID code is verified, the participant will be able to receive the interactive audio channels and data.
- the keypad processor (460) is an 80C451 based microcontroller. However, any similar processor can also be utilized in the present invention.
- the keypad processor (460) preferably controls a 4 X 1 switch (428), the output of which is an appropriate audio channel to be sent to the headphones (198). If more than four audio channels are provided, then an n X 1 switch is preferred, where n corresponds to the number of audio channels.
- the audio channels are amplified by buffer amps which feed the 4 X 1 switch (428).
- the output of the 4 X 1 switch (428) goes to an amplifier (452) with volume control and then is passed to headphones (198).
- the participants are requested to enter responses via the keypad (194). These requests are preferably displayed on the TV monitor (186) at the front of the classroom.
- the interactive programming preferably consists of graphics interrogatory messages (480) with correct and incorrect answers (484) overlaid on the video.
- the preferred four audio tracks preferably recorded in the instructor's own voice, corresponding to correct and incorrect answer choices, are forwarded to the keypads (194) and specifically, the 4 X 1 switch (428).
- the keypad (194) allows the student to interface with the interactive programming by depressing keys (408) corresponding to answers of an interrogatory message. For example, in a multiple-choice question mode, each participant selects a keypad button (408) corresponding to his or her choice. As a result of that selection, the 4 X 1 switch (428) is directed by the processor (460) to switch to the proper audio channel. The user selection is mapped into one or the plurality of audio responses, comprising one or a combination of linked audio segments, after it is applied to a branching algorithm. In this manner, each participant hears a different and personalized response in the instructor's own voice via the headphones (198).
- a large classroom of students and/or single students at home or In separate classrooms can view the same video on the display monitor(s) (186), but can carry on their own unique dialogue with the interactive program.
- the power of this system can be increased exponentially via preloading of additional audio tracks expanding personalized delivery and the mechanism of memory branching wherein the system actually remembers and uses the student's earlier selections to present or compose unique messages to the student. Preloading can occur in set top terminal or school master unit memory also.
- the range of possible audio responses can be dramatically increased by preloading audio segments.
- the common factor in all these embodiments Is the effective use of time.
- Preloading can be accomplished by sending additional audio segments in a time period prior to that period in which the normal four audio responses are sent, e.g. while the instructor Is proceeding with his or her lecture.
- three audio segments can be retrieved from the instructor's computer (114) and simultaneously transported to the audio mixer (118) at time t n - ⁇ -
- the plurality of audio channels combined with the instructor's live voice audio are output from the audio mixer (118), embedded in the video signal by the inserter (214), and transmitted to the remote sites.
- the extractor (174) forwards the instructor's audio to the remotes (194) while the additional response audio segments are stored in memory (284). Meanwhile, the graphics video (472) with interrogatory message (480) is displayed on the monitor (186).
- the instructor requests that the students enter their answers on the keypads (194) at time t formula, then preferably four more audio responses are output from the instructor's PC (114), passed through the audio mixer (118), embedded in the video signal at the inserter (114) and transmitted to the remote sites. Near the end of the answer period, the audio responses are extracted from the video signal.
- the controller (178) sends a command to retrieve the three stored audio responses from memory (284).
- audio segments are retrieved from memory (284), aligned with the newly transmitted audio responses and forwarded to the keypads (194).
- a cable (404) capable of carrying additional signals and a higher order switch e.g., 7 X 1 switch
- the prestored audio responses could be forwarded after the first four audio responses have been received by the remotes (194).
- the student selected an answer which indicates that a stored response is appropriate he or she will not hear anything for a momentary time period, because the transmitted audio segments must play through.
- the appropriate stored response is forwarded to the remote (194) to be played for the student.
- this embodiment has been described using three prestored audio responses, any number of such audio responses can be sent during earlier periods in time.
- Audio response capacity can be further increased by using stored macros at the remote sites.
- additional audio response segments must be preloaded into memory (284) at the classroom master unit (170), school master unit, cable master unit or cable set top terminal.
- a signal Is sent from the keypad (194) back to the classroom master unit (170).
- the controller (178) interprets the signal and reads the appropriate macro; the selected entry is mapped to a stored audio track, the track is retrieved from memory (284) and forwarded to the student.
- the interactive audio branching is preferably performed in the keypad (194).
- the branching algorithm preferably defined by a series of branch codes, is downloaded from the teacher control unit (100) to the classroom master unit (170) and forwarded to the keypad processor (460).
- the keypad processor (460) stores the algorithm in associated RAM memory (464).
- the algorithm determines the proper channel to switch to as a function of the student selection.
- the branching mechanism could be performed in the classroom master unit (170), school master unit, cable master unit or cable set top terminal.
- the student keypad selection is forwarded from the keypad (194) to the classroom master unit processor (178).
- the classroom master unit processor (178) would be connected to a switch and would direct the branching in the switch according to the branching algorithm stored in RAM (284) and the student selected response.
- the audio signal selected is then simply forwarded to the keypad (194) and attached headphones (148) for the student to hear the correct audio segment.
- the branching algorithm can be expanded by utilizing previous user selections in making a decision on a current audio segment.
- This is the memory branching embodiment.
- previous user responses stored in RAM memory (464) in the keypad (194)
- Successive audio output segments can be related in a "decision-tree" type relationship.
- the logic network, or algorithm processes the data input for selection of an audio output response message.
- Audio response segments can be tailored to match different levels of student performance.
- Another embodiment uses "stacking" to increase the answer response options.
- the expansion is due to linking separate audio segments separated in time to form a greater number of answer responses.
- the following example illustrates the use of stacking as well as memory branching, described above.
- the left hand column of the example shows the interactions between the program and the student.
- the right hand column shows the logic applied and branching performed by the keypad. TYPE OF INTERACTION ACTION TO BE PERFORMED
- Branch #3 to Branch #4 Therefore, the present invention covers numerous methods for increasing the interactive audio response capabilities.
- the keypad (194) is attached to 8-conductor cable (404) by RJ-45 connectors (406).
- RJ-45 connectors (406) Alternatively, physical connections can be dispensed with completely by using keypads (194) that have the capability of sending and receiving infrared commands to the classroom master control unit (170).
- the keypad (194) connects to the site controller (178) by infrared connection, the keypad (194) utilizes a battery as a power source.
- the input into the handset (194) from the RJ-45 connector (406) includes the plurality of audio channels, data codes, and a voltage differential provided by plus 12 volts signal and ground. Data from the master unit processor (170) is transferred to the remote processor (460) via an RS-485 interface (262).
- Status messages and participant responses are sent back from the remote sites to the teacher control system (100) via return paths.
- the return paths can be dial-up telephone lines or via an X.25 packet switched network, cable, wireless networks, etc.
- the preferred method of sending this information is by polling the remote sites from the administrative computer (122). Alternatively, the remote sites can send performance information and messages after consolidation, at periodic intervals.
- the classroom master unit (170), school master unit or remote set top terminal prepares a report which can be printed out and/or transmitted back to the headend.
- the classroom can either immediately call the host computer (134) and deliver it's report or send the report at a predetermined time that was preset by the program.
- Packets of relevant data for the entire classroom are created and formatted at the classroom master unit (170). These packets are stored at the classroom master unit (170) until the unit (170) is polled by the administrative computer (122) for information retrieval. Any suitable polling request and response message format may be used to query each classroom master unit (170), one by one.
- the classroom master units (170) are identified by a classroom master unit identifier. For bandwidth efficiency, it is preferred that the classroom master unit (170) transmit information and messages to the teacher control unit (100) only when allowed to do so by the teacher control unit (100). Sites that are connected during broadcast send statistical information to the teacher control unit (100) after each question.
- the site controller (178) is also preferably programmed to keep track of all the participant scores, and when a particular level (e.g., class performing above a predetermined standard) is attained, the controller (178) can send a message to the teacher control unit (100) indicating that the site has attained a particular level of performance.
- a particular level e.g., class performing above a predetermined standard
- the classroom master units (170) use Internet, the units would interface via an X.25 gateway. If the system uses the Public Switched Telephone Network (PSTN), the interface preferably consists of telco interfaces (308). Alternatively, the system may return information using upstream cable using appropriate technology. In a more complex system with thousands of sites, a networking ability such as that available from a national carrier is preferred.
- PSTN Public Switched Telephone Network
- Voice circuits can also be established between the remote sites and the teacher control unit (100). These circuits also interface with the telco interface units (308). However, because instantaneous personalized instruction is attained in the present invention via the transmitted one ⁇ way interactive programming signal, return voice circuits are not necessary in the present invention. Voice circuits can also be established through a cable television system if so equipped in which case a link is established between the cable headend and the teacher control unit (100).
- telco interface units (128) As shown in Figure 2.
- the telco answering units (128) route participant audio to the audio mixer and data packets to the host computer (134).
- the administrative computer (122) polls the remote sites for student response data. Polling software is loaded into the administrative computer (122) for performing polling functions.
- the host computer (134) contains software for tallying student scores, organizing student scores into class statistics, and organizing data into bar graph or chart form. The host computer (134) processes the data according to programmed software instructions, and reformats the data for printing or display. The student and class evaluation statistics for the interrogatory messages can be displayed on a monitor (202) for viewing by the instructor.
- the Instructor could transmit a message over the distance learning system 98 such as follows: "Great job, Toledo. How have you done so well?" The teacher hits a button on the computer (114) designating the Toledo classroom. A data command is sent over the direct learning system (98) and is received by the Toledo classroom master unit (170) as part of the interactive video signal. The command instructs the site controller (178) to connect up a return telephone line back to the head-end (100). The Toledo processor (178) redials the teacher control system (100) automatically and establishes a voice link.
- the direct learning system (98) uses one video and two or more simultaneously transmitted and related audio signals, permitting each student at the multiple classroom locations to interact with the television presentation and receive different segments of the transmitted audio programming without making a conscious choice to change channels.
- an INITIATION command is sent from the instructor's personal computer (114) to all the remote site controllers (178) and set top boxes.
- the site controller (178) forwards this command to the keypads (194).
- Each keypad (194) defaults to a predetermined channel (e.g., channel 1).
- the site controllers (178) send a command requesting the participant to "INPUT YOUR ID.”
- the participant then enters an identification code.
- the classroom master unit (170) checks the entered ID against a list of valid IDs in memory (284) and sends a message to the keypad (194) informing the user whether or not the entry is valid. If the ID is invalid, the participant is denied access to the system.
- the classroom master unit processor (178) instructs the keypad (194) to switch to a predetermined audio channel or the set top box is instructed to tune to a particular audio channel.
- the students hear the instructor begin the lecture via this channel.
- the student also views the instructor via video display on the television monitor (186).
- the instructor's lecture is transmitted from the teacher control unit (100) to the authorized students at the remote locations.
- the instructor may desire to query the students, such as follows: "Alright, students. It's time to answer some questions.”
- the instructor will click on a PICON displayed on the instructor's personal computer (114) which preferably designates a particular interrogatory message.
- the interrogatory graphics message file is called from memory.
- the graphics slide (472) is transmitted as video to the remote sites.
- the students view the graphics slide (472) on the television while listening to the instructor on channel one.
- the teacher informs the students to answer the question, by stating for example, "OK, everyone please answer the question now.”
- a plurality of related audio messages are embedded in the video signals and transmitted to the remote classroom sites.
- a BEGIN INPUT command is sent to all of the remote site controllers (178) instructing then to accept input from the keypads (194).
- the controller (178) decodes the command and forwards a similar command to the keypads (194).
- the last input before the expiration of the INPUT period is accepted as the student's selection by the system.
- the embedded plurality of audio channels and data codes are extracted, amplified and sent to the keypads (194).
- the audio channels correspond to correct and incorrect answer choices to the interrogatory message.
- the data codes are decoded by the site controller (178) and the interactive program branching codes are sent to each keypad (194).
- An interrogatory message (480) continues to be displayed on the television screen as shown in Figure 7.
- Interrogatory messages There are several different types of interrogatory messages (480). Objective messages are questions that have a specific right answer (True/False, multiple choice [A, B, C, or DJ, YES/NO, direct entry). Demographic questions are questions that ask the student's opinion and have no right or wrong answer. A student can also be asked to rate or rank a list. Preferably, four separate optional inputs are available for selection by the student. A student can also be asked personal information (e.g., "Are you a boy or a girl?").
- each audio signal each of which comprises a complete or part of a message in response to the selection on the keypad (194). Therefore, when a key (408) is depressed on the keypad (194), a personalized response is branched to the headphones (198) corresponding to the answer.
- the personalized response is recorded in the instructor's own voice and provides an explanation as to why the student's particular choice is correct or incorrect and may also provide helpful hints for avoiding future mistakes.
- the student chooses one of the four options (484): A, B, C or D. Assuming that the student chooses an incorrect answer, such as D, the keypad processor (460) immediately switches to the audio segment stating, for example: "You are incorrect.
- the user selection is transmitted back to the classroom master unit controller (178).
- the controller (178) stores this selection, and all other participant selections in RAM (286) for later return to the head-end upon a polling command from the teacher control unit (100) or periodic update to the teacher control unit (100).
- a useful tool for instruction in the present invention is the utility of memory branching.
- the branching algorithm can be expanded to allow for a more individualized response by using previous user selections to determine an output audio segment. This is termed memory branching.
- Different branching algorithms are formed by sequences of branch codes that are sent from the head-end to each of the remote sites.
- the direct learning system (98) can utilize memory accumulation to tailor personalized audio messages according to a decision tree logic algorithm.
- the algorithm utilizes previous responses to deliver a personally tailored information message for a particular student.
- Student selections are preferably stored in memory separately for each student. Therefore, a unique message can be compiled for each student. For example, while one student is provided additional instruction in an area where he or she is scoring low, other students can move ahead with more challenging material.
- Memory branching can be used with preloaded audio so that the audio interactivity is increased due to a larger number of possible audio responses. Memory branching is a technique where the instructor recalls a previous input(s) the student selected earlier. When using memory, the individual audio responses, or memory branches, are occurring in real time simultaneously. As the following examples demonstrate, the timings of the branches need not be exactly the same, just close.
- Branch 1 You said you do own a personal computer.
- Branch 2 You said you don't own a personal computer.
- Branch 3 You didn't say if you owned a computer.
- Summary memory branches tally the correct responses in a section of a program, or the entire program. Depending on the circumstances, these summaries can be quantitative or qualitative, or a combination of the two. As with regular audio branches, if there are four audio branches to a question, then there can be no special branch for someone who failed to choose an answer. However, if there are less than four stated choices for the participant, a memory branch covering those who failed to choose an answer would be appropriate.
- the quantitative summary memory branches mention the actual number of responses provided by the participant during a particular segment of the program, for example: MEMORY BRANCHES
- Branch 2 You answered two of the last three questions right. Very good.
- Branch 3 You answered one of the last three questions right. Keep trying.
- Branch 4 You missed all of the last three questions. Don't worry, keep trying.
- the qualitative summary memory branches do not mention the actual number of responses totaled, but provide a qualitative response to the participant based on the participant's progress, for example:
- Branch 1 You're getting all my questions right! You're learning well today! I'm so proud of you! Branch 2: I can see you're learning how to use "Wait, Think, See, So.”
- a combination of the quantitative and qualitative approaches can be used to reward success but avoid punishing failure.
- the combination summary memory branches use quantitative language for the successful participants, but qualitative memory branches for the unsuccessful participants. An example is provided below:
- Branch 2 You answered two of the last three questions right. Very good.
- Branch 3 Some of these questions can be difficult. Don't be discouraged.
- a special form of summary branches is known as stacking.
- stacking the present invention can offer more than four possible summary branches. For instance, at the end of a program, the following memory branches may be offered:
- Branch 1 You answered all seven of my questions correctly. Outstanding!
- Branch 2 You answered six of my seven questions correctly.
- Branch 3 You answered five of my seven questions correctly. Good going.
- Branch 4 I want to thank you for joining me on this program. It was fun. The first three branches provide specific responses. The fourth branch merely offers generic positive reinforcement. A new set of memory branches immediately follows the first set:
- Branch 1 You answered four of my seven questions correctly. Good work.
- Branch 3 I asked you some tricky questions and you did your best. Good job.
- Branch 4 I want to thank you for joining me on the program. It was fun. The second set of branches continues listing the quantitative outcomes, until the third branch, which becomes qualitative. The fourth branch is generic positive reinforcement.
- a comparative memory branch is an elaborate version of the summary memory branch. These branches compare several previous responses. For example, the participant is asked three different times what he/she thinks the order of finish will be in a race. If there are four choices as to the order of finish, there are sixty four possible combinations of responses. However, if prepared properly, the four memory branches at the end of the race will cover everyone. Conclusive memory branches relate one response to another response. For example, after the instructor repeats a question asked earlier in the program, the participant might hear:
- Branch 1 So you agree with Smithers.
- Branch 2 So you disagree with Smithers.
- the four basic categories of memory branching can be used together to create a powerful instruction tool. For example, assume that the instructor Is near the end of a European history program. The instructor is joined In the studio at the head-end by a student, "Bob,” who also tries to answer the instructor's questions.
- the instructor first asks the students at the remote locations a question: "Who fought at the Battle of Waterloo?" Each student gives his/her response on the keypad (194). Then the instructor asks Bob for his response. Bob gives his answer. Then the instructor says to the students at the remote locations:
- Branch 1 You agreed with Bob.
- Branch 2 You disagreed with Bob.
- Branch 1 You've changed your answer. This question is tricky.
- Branch 2 You haven't changed your answer. You're confident. (After the correct response is given, a final comparative memory branch puts this into context.)
- Branch 2 Most of your answers were correct. You were terrific. Branch 3: Some of your answers were correct. Good trying.
- Branch 4 European history can be tricky. You'll improve.
- the student is an active and important participant, engaged in a dialogue with the television program.
- the above are simple examples of memory branching concepts. More elaborate presentations can be created and provided by the present invention. An almost infinite number of summary memory branches can be stacked to create a multitude of possible message combinations.
- the present invention allows for an interactive session to be recorded while retaining the interactive elements for a participant's later viewing.
- the codes and multiple audio channels are embedded in the interactive video signal.
- the program can be recorded on tape according to the methods described in the above- identified ACTV patents.
- the videotape could be played back at the student's convenience on a VCR either at the teacher control unit 100 or at the classroom master control unit (170).
- the present invention does not require return paths.
- the optional return paths in the present invention are simply for facilitating distance learning system management functions and enhancing the educational experience.
- the return paths in the present invention give the instructor a level of understanding of how well the students are responding, thereby allowing the instructor the ability to gauge the effectiveness of the lecture. If the return scores indicate that a majority of students are deficient in a certain area, the instructor can focus instruction in that area.
- return paths requires a tradeoff of bandwidth versus the benefits provided the instructor in receiving student performance feedback.
- return paths from half of the sites could be eliminated without affecting participant interaction. Even though the instructor is only receiving performance indications from half the classrooms, this reduced amount of information is sufficient to allow the instructor feedback on the comprehension of the lecture. In any event, expensive and extensive return paths are minimized in the present invention.
- the distance learning system of the present invention maximizes personalized responses to students in real time using a low cost interactive system.
Abstract
Description
Claims
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EP95916394A EP0755608A4 (en) | 1994-04-15 | 1995-04-14 | A distance learning system providing individual television participation, audio responses, and memory for every student |
AU22907/95A AU686795B2 (en) | 1994-04-15 | 1995-04-14 | A distance learning system providing individual television participation, audio responses, and memory for every student |
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WO1997027572A1 (en) * | 1996-01-24 | 1997-07-31 | Guy Frederick R | Remote learning system |
US6937841B1 (en) | 1996-01-24 | 2005-08-30 | Frederick R. Guy | Remote communication system and method |
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EP0843432A3 (en) * | 1996-10-24 | 1999-12-29 | Fleetwood Group, Inc. | Interactive system for collecting responses from a plurality of remote units |
EP0843432A2 (en) * | 1996-10-24 | 1998-05-20 | Fleetwood Group, Inc. | Interactive system for collecting responses from a plurality of remote units |
WO1998050899A1 (en) * | 1997-05-02 | 1998-11-12 | Ef Education First Ltd. | Method for synchronising an interactive client server system |
WO1999038139A1 (en) * | 1998-01-21 | 1999-07-29 | Jesper Lohse | Method for creating a flexible and efficient distributed educational system, in a computer environment, with the possibility to protect instructions and data |
US6701125B1 (en) | 1998-01-21 | 2004-03-02 | Jesper Lohse | Method for developing a flexible and efficient educational system |
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WO2003049064A1 (en) * | 2001-12-06 | 2003-06-12 | Universidade Católica Portuguesa | Interactive teaching / learning system |
EP1379087A1 (en) * | 2002-05-20 | 2004-01-07 | K Communication SpA | Apparatus and method for the transmission and exchange of information using a television network |
EP2902993A1 (en) | 2014-01-29 | 2015-08-05 | Provadis Partner für Bildung und Beratung GmbH | Wireless teaching system |
Also Published As
Publication number | Publication date |
---|---|
CA2189136C (en) | 2000-07-18 |
US5585858A (en) | 1996-12-17 |
AU686795B2 (en) | 1998-02-12 |
AU2290795A (en) | 1995-11-10 |
EP0755608A1 (en) | 1997-01-29 |
US5537141A (en) | 1996-07-16 |
EP0755608A4 (en) | 1997-12-17 |
MX9605440A (en) | 1998-05-31 |
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