CN101621647B - Three-in-one tuner with compatibility of DVB-T/C and ATV - Google Patents
Three-in-one tuner with compatibility of DVB-T/C and ATV Download PDFInfo
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Abstract
The invention discloses a three-in-one tuner with the compatibility of DVB-T/C and ATV, comprising an input selection module, a selection control circuit, a radio-frequency gain adjustment module, a down-conversion module and a decoding demodulation module, wherein, the input selection module is used for selecting two groups of input signals of a ground signal and a wired signal; the selection control circuit is used for controlling the input selection module to carry out input selection on a radio-frequency signal; the radio-frequency gain adjustment module is used for controlling the gain of the radio-frequency signal; the down-conversion module is used for converting the received radio-frequency signal into an intermediate-frequency signal suitable for the decoding demodulation module; and the decoding demodulation module is used for decoding and demodulating the intermediate-frequency signal after being amplified. In the invention, two signal lines are connected to the two input ends of a high-frequency head, which one of the ground signal and the wired signal is input to a lower-level circuit by the input selection module, the invention has simple circuit formation structure, realizes the compatibility of the DVB-T/C and the ATV and has good performance and high sensitivity; and compared with the prior art, the invention has more convenient debugging and use.
Description
Technical field
The present invention relates to a kind of tuner, the three-in-one tuner of particularly a kind of DVB-T/C and ATV compatibility, wherein, DVB-T refers to terrestrial DTV, and DVB-C refers to cable digital TV, and the ATV finger print is intended TV.
Background technology
The basic function of TV receiving system is to receive anolog TV signals and digital television signal (operating frequency is 51MHZ-860MHZ), this signal imports in the tuner through feeder line, tuner is controlled by receiver, from the signal in this broadband, select an individual passage, by processes such as frequency translations, motherboard by inside carries out signal processing again, final output simulation audio/video signal is for use, as depicted in figs. 1 and 2, in the prior art, radio frequency part that Digital Television receives and simulated television receives and demodulation part branch are arranged, and be Digital Television to be received and the shared decoding of the radio frequency demodulation part branch of simulated television reception is arranged in some cases, the circuit of existing tuner is formed and had following defective: (1) is because DVB-T and ATV circuit are difficult to compatibility, add in the circuit that simulated television receives promptly that strong signal can appear in radio frequency low noise amplification module and the situation that can not satisfy the client, perhaps in the circuit that Digital Television receives, remove radio frequency low noise amplification module and the phenomenon that weak signal can not reach the client can occur, make technical indicator be difficult to reach the regulation requirement; (2) circuit of existing tuner is formed more complicated, so that very inconvenience is debugged and used to tuner.
At present, do not see the tuner that to realize DVB-T/C and ATV compatibility on the market as yet.
Summary of the invention
The object of the present invention is to provide a kind of simple in structure, performance good, highly sensitive, debugging and the DVB-T/C easy to use and the three-in-one tuner of ATV compatibility.
Purpose of the present invention can realize by following scheme: the three-in-one tuner of a kind of DVB-T/C and ATV compatibility is characterized in that comprising:
Module is selected in input, is used for the selection of ground signal and two groups of input signals of wire signal;
Select control circuit, be used for the control input and select module that radiofrequency signal is imported selection;
The rf gain adjustment module is used for the radiofrequency signal gain controlling;
Down conversion module, the radiofrequency signal frequency conversion that is used for receiving are the intermediate-freuqncy signal that is applicable to the decoding demodulation module;
The decoding demodulation module is used for amplified IF signal is decoded and demodulation;
Described tuned radio-frequency amplification module input selects module to select input to connect signal source through selecting control circuit control input, the signal that the signal of described rf gain adjustment module amplifies output termination down conversion module amplifies input, the signal input end of intermediate frequency of the intermediate-freuqncy signal output termination decoding demodulation module of down conversion module, the intermediate-frequency gain control input end of down conversion module connects the intermediate-frequency gain control output end of decoding demodulation module, and the rf gain signal input end of rf gain adjustment module connects the rf gain control signal output ends of down conversion module; The corresponding port of the control termination down conversion module of decoding demodulation module, the decoding demodulation module connects the master controller corresponding port by each data terminal; Down conversion module is located at by described selection control circuit and input is selected between the module, the signal input end that control circuit is selected in the selection control signal output ends selecting of down conversion module selects the selection signal output part of control circuit to connect the selection signal input part that module is selected in input.
The above-mentioned terrestrial television signal of the present invention comprises anolog TV signals and digital television signal, wire signal comprises wired anolog TV signals and digital catv signal, the present invention adopts two signal line to receive two inputs of tuner, select module which selects be input to subordinate's circuit by input, circuit of the present invention is formed simple in structure, has realized DVB-T/C and ATV compatibility, and performance is good, highly sensitive, compared with prior art, debug and use more convenient.
As a kind of improvement of the present invention, select to be connected with between the module radio frequency low noise amplification module that is used for the signal amplification at described tuned radio-frequency amplification module and input.Radio frequency low noise amplification module can improve signal receiving sensitivity.
Selection control circuit of the present invention comprises triode Q2, Q3, resistance R 6～R14, wherein, the collector electrode of triode Q2 connects operating voltage by resistance R 9 and is connected to one of them selection signal input part C1 that module is selected in input, the grounded emitter of triode Q2, its base stage is by resistance R 8 ground connection and pass through the selection control signal output ends that resistance R 7 connects down conversion module; The emitter of triode Q3 is connected to input and selects another selection signal input part C2 of module and pass through resistance R 11 ground connection, connect operating voltage by resistance R 10 simultaneously, the collector electrode of triode Q3 connects operating voltage by resistance R 13 ground connection and by resistance R 14, and its base stage is by resistance R 12 ground connection and pass through the selection control signal output ends that resistance R 6 connects down conversion module.
The present invention is provided with the gain control circuit that is used to realize rf gain control between described decoding demodulation module and tuned radio-frequency amplification module.Described gain control circuit comprises triode Q1, resistance R 1～R5, wherein, the base stage of triode Q1 connects operating voltage by resistance R 4, again by resistance R 3 ground connection, connect the inside and outside gain controlling output of decoding demodulation module simultaneously by resistance R 2, the emitter of triode Q1 is connected by the intermediate-frequency gain control output end of resistance R 1 with the decoding demodulation module, and its collector electrode is connected with the rf gain signal input end of tuned radio-frequency amplification module by resistance R 5.When receiving analog signal, control AGC, i.e. external control by demodulation module IC control rf gain; Down conversion module IC control radio frequency AGC during receiving digital signals, i.e. internal control, separately control of rf gain control AGC like this, rf gain control AGC switches an I/O mouth control by demodulation module IC; Same demodulation module IC is used in analog-and digital-demodulation, and only with the input of one road intermediate frequency, and in down conversion module that intermediate frequency filtering is built-in, save two SAW circuit, make overall structure simple, Installation and Debugging are easier.
Input of the present invention selects module to adopt the PE42742 cake core; Described down conversion module adopts the ICEN4020 cake core; Described decoding demodulation module adopts the DRX3926K cake core.
Compared with prior art, the present invention has following significant technique effect:
(1) the present invention adopts input to select the module select signal input, is keeping having realized DVB-T/C and ATV compatibility under the good prerequisite of reception DTV and ATV performance;
(2) the radio frequency low noise amplification module of selecting to be connected between the module in tuned radio-frequency amplification module and input can improve signal receiving sensitivity;
(3) the present invention only adopts built-in intermediate frequency filtering, compares with having two intermediate frequency filtering modules in the anolog TV signals receiving circuit in the prior art, has simplified circuit structure, makes Installation and Debugging more simple and convenient;
(4) performance of the present invention is good, highly sensitive, and relevant technical indicator can reach the regulation requirement;
(5) circuit composition of the present invention is simple in structure, is particularly useful for the three-in-one TV receiving system of DVB-T/C and ATV.
Description of drawings
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the existing tuner circuit theory of constitution figure that receives anolog TV signals;
Fig. 2 is the tuner circuit theory of constitution figure of existing receiving digital television signal;
Fig. 3 is that circuit of the present invention is formed schematic diagram;
Fig. 4 is circuit control principle figure of the present invention.
Embodiment
Shown in Fig. 3,4, the three-in-one tuner of DVB-T/C of the present invention and ATV compatibility, comprise input selection module, be used for the selection of terrestrial television signal (comprising anolog TV signals and digital television signal) and two groups of input signals of cable TV signal (comprising line anolog TV signals and digital catv signal); Radio frequency low noise amplification module, be used for that signal amplifies and and prime between impedance matching; The rf gain adjustment module is used for the radiofrequency signal gain controlling; Down conversion module, the radiofrequency signal frequency conversion that is used for receiving are the intermediate-freuqncy signal that is applicable to the decoding demodulation module; Select control circuit, be used for the control input and select module that radiofrequency signal is imported selection; The decoding demodulation module is used for amplified IF signal is decoded and demodulation.
Input selects the module by signal output to connect radio frequency low noise amplification module, the radio frequency low noise is amplified the module by signal output and is connected the tuned radio-frequency amplification module, in the present embodiment, radio frequency low noise amplification module is made of separate piece such as BFP193W, the signal output part of RF Amplifier Module connects uses the rf gain adjustment module, the signal output part of rf gain adjustment module connects the signal input part of down conversion module, down conversion module adopts IC EN4020, and down conversion module comprises: the rf gain control output end, the intermediate-frequency gain control input end, the intermediate-freuqncy signal output, the intermediate frequency amplification module, the serial clock input, the serial data input, give the reference clock output of decoding demodulation module.Decoding demodulation module correspondence be provided with intermediate-frequency gain control output end, signal input end of intermediate frequency, serial clock output, serial data output and reference clock input, also be provided with the rf gain control input end that the rf gain control output end is connected to the rf gain adjustment module, simulation A/V signal output part; Also be provided for the intermediate frequency filtering module SWA of modified signal between the intermediate frequency input and output connectivity port of down conversion module and intermediate frequency amplification module.Interface between decoding demodulation module and master controller comprises serial/parallel line data stream, data flow clock, synchronizing signal and miscue signal and I
2C bus and reset terminal, simulation A/V signal output part.Data flow decoding and analog codec demodulation module adopt IC DRX3926K.
Select control circuit to comprise triode Q2 and Q3, resistance R 6～R14, wherein, the collector electrode of triode Q2 connects positive 5V operating voltage by resistance R 9, and be connected to that input selects module one of them select signal input part C1, the grounded emitter of triode Q2, its base stage is by resistance R 8 ground connection and pass through the P3 mouth signal output that resistance R 7 connects down conversion module; The emitter of triode Q3 is connected to input and selects another selection signal input part C2 of module and pass through resistance R 11 ground connection, connect positive 5V operating voltage by resistance R 10 simultaneously, the collector electrode of triode Q3 connects positive 5V operating voltage by resistance R 13 ground connection and by resistance R 14, and its base stage is by resistance R 12 ground connection and pass through the P3 mouth signal output that resistance R 6 connects down conversion module.
Wherein, triode Q2 adopts NPN transistor, triode Q3 adopts PNP transistor, in the present embodiment, input selects module to adopt the PE42742 cake core, operation principle is as follows: from indoor cable TV signal (comprising digital catv signal and wired anolog TV signals) with from outdoor terrestrial television signal (comprising digital television signal and anolog TV signals), by two IEC type plug A, the last feed-in of B, pass through I by master controller respectively
2The P3 port output high level of the total line traffic control down-conversion of C, make triode Q2 conducting, triode Q3 ends, make that selecting signal input part C1 is low level, selecting signal input part C2 is high level, radiofrequency signal by input select module the input of B port (otherwise, P3 port output low level, make triode Q3 conducting, triode Q2 ends, make that selecting signal input part C1 is high level, selecting signal input part C2 is low level, and radiofrequency signal is then selected the A port input of module by input), after radio frequency low noise amplification module amplifies, be input to the tuned radio-frequency amplification module, the resonant tank of tuning amplification module is selected the channel that will receive and is sent into down conversion module by the tuning voltage control that down conversion module produces, and down conversion module is converted to the intermediate-freuqncy signal that the decoding demodulation module can be discerned with radiofrequency signal, through amplifying after the intermediate frequency filtering module SWA filtering, export the gain of rf gain control signal control tuned radio-frequency amplification module simultaneously.
In other embodiments, also can be by the port of decoding demodulation module control output rf gain control signal.In the present embodiment, between decoding demodulation module and tuned radio-frequency amplification module, be provided with the gain control circuit that is used to realize rf gain control, gain control circuit comprises triode Q1, resistance R 1～R5, wherein, triode Q1 adopts PNP transistor, the base stage of triode Q1 connects positive 5V operating voltage by resistance R 4, again by resistance R 3 ground connection, connect the inside and outside gain controlling output of decoding demodulation module simultaneously by resistance R 2, the emitter of triode Q1 is connected by the intermediate-frequency gain control output end of resistance R 1 with the decoding demodulation module, and its collector electrode is connected with the rf gain signal input end of tuned radio-frequency amplification module by resistance R 5.
When receiving analog signal, rf gain control RF AGC is by the control of decoding demodulation module, and when receiving digital signals, rf gain control RF AGC is controlled by down conversion module, concrete control procedure is as follows: when receiving analog signal, pass through I by master controller
2The C bus is sent control command to the decoding demodulation module, makes the GPIO2 port output low level of decoding demodulation module, and triode Q1 conducting makes the RF AGC in the down conversion module transfer external control to by internal control; When receiving digital signals, pass through I by master controller
2The C bus is sent control command to the decoding demodulation module, makes the GPIO2 port output high level of decoding demodulation module, and triode Q1 ends, and makes the RFAGC in the down conversion module transfer internal control to by external control; The decoding demodulation module is connected the corresponding port to the intermediate-frequency gain control end that intermediate frequency amplification module and tuned radio-frequency amplification module are provided with the rf gain control end, forms feedback network, realizes automatic gain control.
The data of decoding demodulation module after with demodulation by serial/parallel line data flow, data flow clock, synchronizing signal and miscue, A/V (Voice ﹠ Video signal) signal conveys is to grade master board afterwards.Back level master board can be passed through I
2C bus and reset terminal control decoding demodulation module, and the loop that produces the amplification module in the control down conversion module by the decoding demodulation module by serial clock terminal SCL and serial data end SDA down conversion module, to need to select the channel of demodulation from signal source, reach the effect of arbitrarily watching different channel.
The switching of DVB-T/C and ATV can be passed through I by back level master board
2The total line traffic control of C.Process is as follows, behind master board and the tuner electrification reset of the present invention, people by TV reception sends control command by man-machine interface to master controller, for example watches analog television program (the hypothetical simulation TV programme is at the B port), and then master controller can pass through I after receiving instruction
2C sends dependent instruction to the decoding demodulation module, makes the GPIO2 port output low level of decoding demodulation module, and triode Q1 conducting makes the RF AGC in the down conversion module transfer external control to by internal control; The P3 port output high level of down conversion module, make triode Q2 conducting, triode Q3 ends, making and selecting signal input part C1 is low level, selecting signal input part C2 is high level, radiofrequency signal is selected the B port input of module by input, and turn off DVB-T and DVB-C, ATV is opened, make down conversion module produce the loop of the amplification module in the control down conversion module by the decoding demodulation module by serial clock terminal SCL and serial data end SDA, to need to select the channel of demodulation from signal source, give decoding demodulation module demodulation output A/V (Voice ﹠ Video signal).
As watch digital DVB-C TV programme (supposing that digital DVB-C TV programme is at the A port), then master controller can pass through I after receiving instruction
2C sends dependent instruction to the decoding demodulation module, makes the GPIO2 port output high level of decoding demodulation module, and triode Q1 ends, and makes the RF AGC in the down conversion module transfer internal control to by external control; The P3 port output low level of down conversion module, triode Q2 is ended, triode Q3 conducting, selecting signal input part C1 is high level, selecting signal input part C2 is low level, the A mouth signal input of module is selected in input, and turn off DVB-T and ATV, DVB-C is opened, make down conversion module produce the loop of the amplification module in the control down conversion module by the decoding demodulation module by serial clock terminal SCL and serial data end SDA, to need to select the channel of demodulation from signal source, give decoding demodulation module demodulation output stream to master control decoding back output A/V (Voice ﹠ Video signal).
As watch digital DVB-T TV programme (supposing that digital DVB-T TV programme is at the B port), then master controller can pass through I after receiving instruction
2C sends dependent instruction to the decoding demodulation module, makes the RFAGC in the down conversion module transfer internal control to by external control, makes the GPIO2 port output high level of decoding demodulation module, and triode Q1 ends; The P3 port output high level of down conversion module makes triode Q2 conducting, and triode Q3 ends, and selecting signal input part C1 is low level, and selecting signal input part C2 is high level, and the B mouth signal input of module is selected in input; Turn off DVB-C and ATV simultaneously, DVB-T is opened, and make down conversion module produce the loop of the amplification module in the control down conversion module by serial clock terminal SCL and serial data end SDA by the decoding demodulation module, to need to select the channel of demodulation from signal source, give decoding demodulation module demodulation output stream to master control decoding back output A/V (Voice ﹠ Video signal).
Claims (6)
1. the three-in-one tuner of DVB-T/C and ATV compatibility is characterized in that comprising:
Module is selected in input, is used for the selection of ground signal and two groups of input signals of wire signal;
Select control circuit, be used for the control input and select module that radiofrequency signal is imported selection;
The rf gain adjustment module is used for the radiofrequency signal gain controlling;
Down conversion module, the radiofrequency signal frequency conversion that is used for receiving are the intermediate-freuqncy signal that is applicable to the decoding demodulation module;
The decoding demodulation module is used for amplified IF signal is decoded and demodulation;
Described rf gain adjustment module input selects module to select input to connect signal source through selecting control circuit control input, the signal that the signal of described rf gain adjustment module amplifies output termination down conversion module amplifies input, the signal input end of intermediate frequency of the intermediate-freuqncy signal output termination decoding demodulation module of down conversion module; The intermediate-frequency gain control input end of down conversion module connects the intermediate-frequency gain control output end of decoding demodulation module, and the rf gain signal input end of rf gain adjustment module connects the rf gain control signal output ends of down conversion module; The corresponding port of the control termination down conversion module of decoding demodulation module, the decoding demodulation module connects the master controller corresponding port by each data terminal; Down conversion module is located at by described selection control circuit and input is selected between the module, the signal input end that control circuit is selected in the selection control signal output ends selecting of down conversion module selects the selection signal output part of control circuit to connect the selection signal input part that module is selected in input;
Select to be connected with between the module radio frequency low noise amplification module that is used for the signal amplification in described rf gain adjustment module and input;
Between described decoding demodulation module and rf gain adjustment module, be provided with the gain control circuit that is used to realize rf gain control.
2. the three-in-one tuner of DVB-T/C according to claim 1 and ATV compatibility, it is characterized in that: described selection control circuit comprises triode Q2, Q3, resistance R 6～R14, wherein, the collector electrode of triode Q2 connects operating voltage by resistance R 9 and is connected to one of them selection signal input part C1 that module is selected in input, the grounded emitter of triode Q2, its base stage is by resistance R 8 ground connection and pass through the selection control signal output ends that resistance R 7 connects down conversion module; The emitter of triode Q3 is connected to input and selects another selection signal input part C2 of module and pass through resistance R 11 ground connection, connect operating voltage by resistance R 10 simultaneously, the collector electrode of triode Q3 connects operating voltage by resistance R 13 ground connection and by resistance R 14, and its base stage is by resistance R 12 ground connection and pass through the selection control signal output ends that resistance R 6 connects down conversion module.
3. the three-in-one tuner of DVB-T/C according to claim 1 and ATV compatibility, it is characterized in that: described gain control circuit comprises triode Q1, resistance R 1～R5, wherein, the base stage of triode Q1 connects operating voltage by resistance R 4, again by resistance R 3 ground connection, connect the inside and outside gain controlling output of decoding demodulation module simultaneously by resistance R 2, the emitter of triode Q1 is connected by the rf gain control output end of resistance R 1 with the decoding demodulation module, and its collector electrode is connected with the rf gain signal input end of rf gain adjustment module by resistance R 5.
4. the three-in-one tuner of DVB-T/C according to claim 1 and ATV compatibility is characterized in that: described input selects module to adopt the PE42742 cake core.
5. the three-in-one tuner of DVB-T/C according to claim 1 and ATV compatibility is characterized in that: described down conversion module adopts the ICEN4020 cake core.
6. the three-in-one tuner of DVB-T/C according to claim 1 and ATV compatibility is characterized in that: described decoding demodulation module adopts the DRX3926K cake core.
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| US20020036709A1 (en) * | 2000-09-26 | 2002-03-28 | Yusuke Nishida | TV broadcasting reception apparatus, TV broadcasting reception method, and recording medium for recording control progam thereof |
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Address after: 511455 Guangdong city of Guangzhou province Nansha District Huangge Town Ji Sheng Lu No. 2 (plant A) Patentee after: Guangzhou Yi Da Polytron Technologies Inc Address before: 511442 Guangdong Province, Guangzhou City Southern towns Panyu District Dengyun Road No. 8 East Tong Po Industrial Park Haosheng east 2 building five floor Patentee before: Guangzhou Earda Electronic Co., Ltd. |