US2391776A - Intelligence transmission system - Google Patents
Intelligence transmission system Download PDFInfo
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- US2391776A US2391776A US488969A US48896943A US2391776A US 2391776 A US2391776 A US 2391776A US 488969 A US488969 A US 488969A US 48896943 A US48896943 A US 48896943A US 2391776 A US2391776 A US 2391776A
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- impulses
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal
- H03K9/08—Demodulating pulses which have been modulated with a continuously-variable signal of duration- or width-mudulated pulses or of duty-cycle modulated pulses
Definitions
- the present invention relates to the art of signaling, and more particularly to a novel device and method applicable in the transmission and reception of intelligence by signal impulses of varying time duration.
- Sound or video signals may be transmitted by modulating a carrier in such a manner that the carrier itself may have constant amplitude and frequency but will be varied as by keying on and off.
- a system of picture transmission is shown in Patent No. 2,083,245, granted June 8, 1937, to Shore et al.
- the present invention provides a. novel method of and apparatus for converting impulse signals derived, for example, by methods set forth in the Shore patent or in the above noted application into the form of the signals from which they were derived.
- the principal object of the present invention is to provide novel apparatus for obtaining a varying amplitude signal from a series of coded impulses representing transmitted intelligence.
- Another object of the invention is to employ a detector of any usual type in a novel manner for the conversion of pulse width modulation into a wave of varying amplitude.
- Fig. 1 illustrates in block diagram form a television transmitter in which sound is transmitted in the form of variable width pulses.
- Fig. 2 is a diagrammatic illustrative arrangement in accordance with the invention for obtaining a wave of varying amplitude from a series of width modulated pulses.
- Figs. 3 through 8 are illustrative of the mannerv of obtaining a wave of varying amplitude by the apparatus of Fig. 2.
- Fig. 1 of lthe accompanying drawings is similar to Fig. 1 of the above mentioned copending Fredendall et al. application and shows by way of example one method of obtaining width modulated impulses representing sound accompaniment in a television system.
- This arrangement is fully describedand claimed in the above noted application and is included here for the sake of f completeness of disclosure.
- the arrangement for obtaining variable width dots representing picture intelligence is disclosed in detail in the above mentioned Shore et al. patent and therefore need not be described or explained herein in detail.
- Fig. 1 speech or other audible signals, which accompany image'or video signals appearing in a connection I0, are caused to influence a sound signal device I2, which may be the usual type of microphone, and are then supplied to a sound amplifier and lter I4 whose output energy is directed to a modulator I6.
- the wave form of the derived signal from the modulator I6 is changed in an amplifier-limiter I'I and is applied to a mixer I8 so as to be combined with video signals from the connection IU.
- a square Wave pulse source I9 which may be a multi-vibrator. is timed by a source of control impulses 2 I, which may operate, for example, under control of the synchronizing impulses which are employed in the usual manner to control the television scanner.
- Square wave pulses from the source I9 are converted by a wave shaper 22 into triangular impulses which are applied to the modulator I6.
- the wave form of the signals is indicated in the usual manner in the output of each piece of apparatus.
- the output from the mixer I8 is supplied in any suitable manner to the oscillator and modulator of a radio station transmitter or to a communication circuit of any kind.
- Fig. 2 the incoming signal is demodulated in any well known manner (not shown) so as to obtain the series of variable width dots representing intelligence as shown in Fig. 3 of the drawings.
- variable width impulses are obtained in accordance with the arrangement shown in the Shore patent, a simple demodulating step will be used to obtain these pulses from the radio frequency carrier.
- the series of impulses represents the sound accompaniment transmitted along with television video signals in accordance with the arrangement shown in the above noted copending application, these pulses will be separated from the video and the synchronizing signals after demodulation of the radio carrier, preferably in the manner disclosed and claimed in the said application.
- This method comprises, briefly, an arrangement wherein a thermionic device is biased to cutoft except at times when the video signal is not present, and therefore the output of this electrical device represents reconstructed variable width impulses free of noise and interference and of the type shown by Fig. 3 of the accompanying drawings.
- variable width impulses derived either from' a sound or a facsimile signal as in the Shore et al. patent, above noted, are applied to the input of a differentiator 25.
- This diierentiator may comprise a/high pass filter or it may be a stage of ampliilcation in which the grid resistor and the input condenser serve as a high pass RC circuit. If the amplifier type of diierentiator is employed, the pulses may be of negative polarity so that after inversion, the initial peaks will be of positive polarity.
- the output of the diierentiator 25 is shown in Fig. 4 of the drawings and comprises narrow pulses 2l and 28 at the leading and trailing yedges of the variable width pulses 26 of Fig. 3.
- the signal illustrated by Fig. 3 is composed of a series of pulses characterized by leading edges which are periodic in time, and trailing edges having positions which are determined in accordance with the modulating wave.
- the width of the pulse may be proportional ⁇ to the instantaneous value of the complex modul synchronizing means to a multivibrator or other suitable type of square wave generator 29.
- the timed square wave impulses 3l (Fig.
- a wave shaper 32 which may be a triangular wave generator of any suitable type.
- Fig. 6 illustrates the output of the wave Shaper 32 which comprises triangularly shaped impulses 33.
- the circuit elements 29 and 32 may be similar to the elements I9 and 22 of Fig. 1, a specic type of which is described by way of example in the above mentioned copending application of Fredenall et al.
- a clipper 36 which may be of any suitable type, eliminates the pulses 21 and passes along only the pulses 28 amplitude limited in order to remove noise.
- the triangular wave 33 (Fig. 6) and the pulse wave composed of successive pulses 28 with their polarity reversed are added in a mixer 3l, forming the composite Wave shown in Fig. 7.
- the portion of the wave of Fig. 'l below the line -z is removed by a clipper 39, and the useful remaining signal illustrated in Fig. ⁇ 8 constitutes a series of modulated pulses which may be detected by a peak detector or an amplitude detector 62 of any desired type.
- This detector may be a conventional diode detector, a grid-bias detector or a grid leak detector.
- the output connection 43 of the detector B2 may be connected to a sound reproducer E6. If the variable width pulses 26 are derived at the transmitter from a representation of a picture or object in the manner described in the Shore et al. Patent No. 2,083,245 above referred to, the device M may be replaced by a picture recorder so that shadedtone pictures may be reproduced.
- variable width pulses 26 represent the sound accompaniment transmitted along with television video signals in accordance with the arrangement shown in the above noted copending application
- higher delity sound can be obtained by increasing the number of scanning lines so that the number of pulses of sound energy per picture eld, assuming the same eld repetition rate, will be higher, thus with vertical line scanning, the upper frequency register of the transmitted sound would be increased in the illustradescribed herein by way of example are possible, Without departing from the spirit and scope of the invention described herein, and it is desired that any and all of such modifications be considered Within the purview of the present invention deiined by the hereinafter appended claims.
- the method of converting a series of width modulated impulses into a series of amplitude varying output pulses comprising the steps of producing a series of impulses each having a steep front side and a linearly sloping end and of substantially constant amplitude occurring in timed relationship with said series of lwidth modulated impulses, producing a series of impulses occurring in timed relationship with the end of a corresponding width modulated impulse, combining said two series of impulses to produce impulses of varying amplitude, and detecting said impulses of varying amplitude to produce a series of amplitude modulated impulses.
- the method of converting a series of Width modulated impulses into a series of amplitude modulated impulses comprising the steps of producing a series of triangular impulses occurring in timed relationship with said series of width modulated impulses, producing a series of impulses occurring in timed relationship with the end of a corresponding width modulated impulse, combining said triangular impulses and said series of impulses to produce impulses of varying amplitude, and detecting said impulses of varying amplitude to produce a series of amplitude modulated impulses.
- Apparatus for converting a series of Width modulated impulses into a series of amplitude varying output pulses comprising means to produce a series of linearly varying impulses in timed relationship with said series of width modulated impulses, means for producing impulses in timed relationship with the end of each width modulated impulse, means for combining said linearly varying impulses and said last named impulses, means to suppress a portion of said combined impulses, and wave detecting means for producing a series of amplitude varying output pulses.
- Apparatus for converting a series of Width modulated impulses into a series of amplitude varying output pulses comprising means to produce a series of impulses each ⁇ having a steep front side and a linearly sloping end and of substantially constant amplitude in timed relationship with said series of width modulated impulses.
- means for producing impulses in timed relationship with the end of each width modulated mpulse means for combining said linearly sloping end impulses and said last named impulses, means to suppress a portion of said combined impulses, and Wave detecting means for producing a series of amplitude varying output pulses.
Description
Dec. 25, 1945.
G. L. FREDENDALL 2,391,776 INTELLIGENCE TRANSMISSION SYSTEM Filed May 29, 1945 2 Sheets-Sheet l T il..
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IN V EN TOR.
Gordan 1;. Hmmm BY MQW A TTOBNEK Dec- 25, 1945. G. L. FREDENDALL 2,391,775
INTELLIGENCE TRANSMISS ION SYSTEM Filed May 29, 1945 2 Sheets-Sheet 2 T'l-- 1 I+ am .I1
IN V EN TOR.
G/ordon/ Z. Fredendall BY #S/@W A T rop/ver.
Patented Dec. 25, 1945 INTELLIGENCE TRANSMISSION SYSTEM Gordon L. Fredendall, Feasterville, Pa., asslgnor to Radio Corporation of America, a corporation of Delaware Application May 29, 1943, Serial No. 488,969
(Cl. Z50-27) 6 Claims.
The present invention relates to the art of signaling, and more particularly to a novel device and method applicable in the transmission and reception of intelligence by signal impulses of varying time duration.
Sound or video signals may be transmitted by modulating a carrier in such a manner that the carrier itself may have constant amplitude and frequency but will be varied as by keying on and off. A system of picture transmission is shown in Patent No. 2,083,245, granted June 8, 1937, to Shore et al. A copending application of G. L. Fredendall et al., Serial No. 488,968, led May 29, 1943, discloses the transmission of sound by means of derived signal impulses of varying duration. The present invention provides a. novel method of and apparatus for converting impulse signals derived, for example, by methods set forth in the Shore patent or in the above noted application into the form of the signals from which they were derived.
The principal object of the present invention is to provide novel apparatus for obtaining a varying amplitude signal from a series of coded impulses representing transmitted intelligence.
Another object of the invention is to employ a detector of any usual type in a novel manner for the conversion of pulse width modulation into a wave of varying amplitude.
Other and more specic objects of the invention will become apparent from a consideration of the following specification and claims in connection with the accompanying drawings, illustrating one form of the invention in which:
Fig. 1 illustrates in block diagram form a television transmitter in which sound is transmitted in the form of variable width pulses.
Fig. 2 is a diagrammatic illustrative arrangement in accordance with the invention for obtaining a wave of varying amplitude from a series of width modulated pulses.
Figs. 3 through 8 are illustrative of the mannerv of obtaining a wave of varying amplitude by the apparatus of Fig. 2.
Fig. 1 of lthe accompanying drawings is similar to Fig. 1 of the above mentioned copending Fredendall et al. application and shows by way of example one method of obtaining width modulated impulses representing sound accompaniment in a television system. This arrangement is fully describedand claimed in the above noted application and is included here for the sake of f completeness of disclosure. The arrangement for obtaining variable width dots representing picture intelligence is disclosed in detail in the above mentioned Shore et al. patent and therefore need not be described or explained herein in detail.
In Fig. 1, speech or other audible signals, which accompany image'or video signals appearing in a connection I0, are caused to influence a sound signal device I2, which may be the usual type of microphone, and are then supplied to a sound amplifier and lter I4 whose output energy is directed to a modulator I6. The wave form of the derived signal from the modulator I6 is changed in an amplifier-limiter I'I and is applied to a mixer I8 so as to be combined with video signals from the connection IU. A square Wave pulse source I9, which may be a multi-vibrator. is timed by a source of control impulses 2 I, which may operate, for example, under control of the synchronizing impulses which are employed in the usual manner to control the television scanner. Square wave pulses from the source I9 are converted by a wave shaper 22 into triangular impulses which are applied to the modulator I6. The wave form of the signals is indicated in the usual manner in the output of each piece of apparatus. The output from the mixer I8 is supplied in any suitable manner to the oscillator and modulator of a radio station transmitter or to a communication circuit of any kind.
In Fig. 2 the incoming signal is demodulated in any well known manner (not shown) so as to obtain the series of variable width dots representing intelligence as shown in Fig. 3 of the drawings. It will be understood that if variable width impulses are obtained in accordance with the arrangement shown in the Shore patent, a simple demodulating step will be used to obtain these pulses from the radio frequency carrier. If the series of impulses represents the sound accompaniment transmitted along with television video signals in accordance with the arrangement shown in the above noted copending application, these pulses will be separated from the video and the synchronizing signals after demodulation of the radio carrier, preferably in the manner disclosed and claimed in the said application.
This method comprises, briefly, an arrangement wherein a thermionic device is biased to cutoft except at times when the video signal is not present, and therefore the output of this electrical device represents reconstructed variable width impulses free of noise and interference and of the type shown by Fig. 3 of the accompanying drawings.
The variable width impulses derived either from' a sound or a facsimile signal as in the Shore et al. patent, above noted, are applied to the input of a differentiator 25. This diierentiator may comprise a/high pass filter or it may be a stage of ampliilcation in which the grid resistor and the input condenser serve as a high pass RC circuit. If the amplifier type of diierentiator is employed, the pulses may be of negative polarity so that after inversion, the initial peaks will be of positive polarity.
The output of the diierentiator 25 is shown in Fig. 4 of the drawings and comprises narrow pulses 2l and 28 at the leading and trailing yedges of the variable width pulses 26 of Fig. 3. The signal illustrated by Fig. 3 is composed of a series of pulses characterized by leading edges which are periodic in time, and trailing edges having positions which are determined in accordance with the modulating wave. As an example, the width of the pulse may be proportional `to the instantaneous value of the complex modul synchronizing means to a multivibrator or other suitable type of square wave generator 29. The timed square wave impulses 3l (Fig. 5) from the multivibrator 29 are applied to a wave shaper 32, which may be a triangular wave generator of any suitable type.- Fig. 6 illustrates the output of the wave Shaper 32 which comprises triangularly shaped impulses 33. A The circuit elements 29 and 32 may be similar to the elements I9 and 22 of Fig. 1, a specic type of which is described by way of example in the above mentioned copending application of Fredenall et al.
A clipper 36, which may be of any suitable type, eliminates the pulses 21 and passes along only the pulses 28 amplitude limited in order to remove noise. The triangular wave 33 (Fig. 6) and the pulse wave composed of successive pulses 28 with their polarity reversed are added in a mixer 3l, forming the composite Wave shown in Fig. 7. The portion of the wave of Fig. 'l below the line -z is removed by a clipper 39, and the useful remaining signal illustrated in Fig. `8 constitutes a series of modulated pulses which may be detected by a peak detector or an amplitude detector 62 of any desired type. This detector may be a conventional diode detector, a grid-bias detector or a grid leak detector. The output connection 43 of the detector B2 may be connected to a sound reproducer E6. If the variable width pulses 26 are derived at the transmitter from a representation of a picture or object in the manner described in the Shore et al. Patent No. 2,083,245 above referred to, the device M may be replaced by a picture recorder so that shadedtone pictures may be reproduced.
If the variable width pulses 26 represent the sound accompaniment transmitted along with television video signals in accordance with the arrangement shown in the above noted copending application, higher delity sound can be obtained by increasing the number of scanning lines so that the number of pulses of sound energy per picture eld, assuming the same eld repetition rate, will be higher, thus with vertical line scanning, the upper frequency register of the transmitted sound would be increased in the illustradescribed herein by way of example are possible, Without departing from the spirit and scope of the invention described herein, and it is desired that any and all of such modifications be considered Within the purview of the present invention deiined by the hereinafter appended claims.
Having now described -the invention, what is claimed and desired to be secured by Letters Patent is the following: A
1. The method of converting a series of width modulated impulses into .a series of amplitude modulated impulses comprising the steps of producing a series of linearly varying impulses occurring intimed relationship with said series of Width modulated impulses, producing a series of impulses occurring in timed relationship with the end of a corresponding width modulated impulse, combining saidr linearly varying impulses with said series of impulses to produce impulses of varying amplitude, and detectingv said impulses of varying amplitude to produce a series of ampli` tude modulated impulses.
2. The method of converting a series of width modulated impulses into a series of amplitude varying output pulses comprising the steps of producing a series of impulses each having a steep front side and a linearly sloping end and of substantially constant amplitude occurring in timed relationship with said series of lwidth modulated impulses, producing a series of impulses occurring in timed relationship with the end of a corresponding width modulated impulse, combining said two series of impulses to produce impulses of varying amplitude, and detecting said impulses of varying amplitude to produce a series of amplitude modulated impulses.
3. The method of converting a series of Width modulated impulses into a series of amplitude modulated impulses comprising the steps of producing a series of triangular impulses occurring in timed relationship with said series of width modulated impulses, producing a series of impulses occurring in timed relationship with the end of a corresponding width modulated impulse, combining said triangular impulses and said series of impulses to produce impulses of varying amplitude, and detecting said impulses of varying amplitude to produce a series of amplitude modulated impulses.
4. Apparatus for converting a series of Width modulated impulses into a series of amplitude varying output pulses comprising means to produce a series of linearly varying impulses in timed relationship with said series of width modulated impulses, means for producing impulses in timed relationship with the end of each width modulated impulse, means for combining said linearly varying impulses and said last named impulses, means to suppress a portion of said combined impulses, and wave detecting means for producing a series of amplitude varying output pulses.
5. Apparatus for converting a series of Width modulated impulses into a series of amplitude varying output pulses comprising means to produce a series of impulses each` having a steep front side and a linearly sloping end and of substantially constant amplitude in timed relationship with said series of width modulated impulses. means for producing impulses in timed relationship with the end of each width modulated mpulse, means for combining said linearly sloping end impulses and said last named impulses, means to suppress a portion of said combined impulses, and Wave detecting means for producing a series of amplitude varying output pulses.
lated impulse, means i'or combining said triangular impulses and said last named impulses, means to suppress the triangular portion of said impulses, and wave detecting means for producing a 5 series of amplitude varying output pulses.
GORDON L. FREDENDALL
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US488969A US2391776A (en) | 1943-05-29 | 1943-05-29 | Intelligence transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US488969A US2391776A (en) | 1943-05-29 | 1943-05-29 | Intelligence transmission system |
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| Publication Number | Publication Date |
|---|---|
| US2391776A true US2391776A (en) | 1945-12-25 |
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|---|---|---|---|
| US488969A Expired - Lifetime US2391776A (en) | 1943-05-29 | 1943-05-29 | Intelligence transmission system |
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Cited By (53)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2421025A (en) * | 1944-07-29 | 1947-05-27 | Standard Telephones Cables Ltd | Demodulator system |
| US2445775A (en) * | 1945-03-05 | 1948-07-27 | Standard Telephones Cables Ltd | Pulse time modulation multiplex receiver |
| US2467775A (en) * | 1945-10-01 | 1949-04-19 | Hartford Nat Bank & Trust Co | Device for detecting pulses modulated by a signal to be reproduced |
| US2477625A (en) * | 1944-08-25 | 1949-08-02 | Standard Telephones Cables Ltd | Multiplex television and pulse modulated sound system |
| US2477679A (en) * | 1946-04-24 | 1949-08-02 | Standard Telephones Cables Ltd | Television and pulse modulated sound system |
| US2486498A (en) * | 1945-04-20 | 1949-11-01 | Rca Corp | Means for preventing cross talk in sound-vision systems |
| US2489948A (en) * | 1943-09-17 | 1949-11-29 | Cossor Ltd A C | Radio receiving system |
| US2489302A (en) * | 1944-05-26 | 1949-11-29 | Int Standard Electric Corp | Multichannel time modulated electrical pulse communication system |
| US2490801A (en) * | 1946-03-02 | 1949-12-13 | Fed Telecomm Lab Inc | Electrical pulse time modulation circuit |
| US2499844A (en) * | 1947-01-16 | 1950-03-07 | Philco Corp | Receiver for pulse-position-modulation systems |
| US2502213A (en) * | 1944-03-24 | 1950-03-28 | Rca Corp | Intelligence transmission system |
| US2510987A (en) * | 1944-05-26 | 1950-06-13 | Int Standard Electric Corp | Multiplex time modulated electrical pulse demodulation system |
| US2510983A (en) * | 1945-02-23 | 1950-06-13 | Standard Telephones Cables Ltd | Radio receiver |
| US2513308A (en) * | 1945-09-01 | 1950-07-04 | Standard Telephones Cables Ltd | Electrical time modulated pulse communication system |
| US2513291A (en) * | 1943-10-19 | 1950-07-04 | Standard Telephones Cables Ltd | Multiplex pulse time demodulator |
| US2517618A (en) * | 1945-02-19 | 1950-08-08 | Standard Telephones Cables Ltd | Detector for time modulated pulses |
| US2522110A (en) * | 1944-12-21 | 1950-09-12 | Philco Corp | Pulse detector system |
| US2521710A (en) * | 1947-05-21 | 1950-09-12 | Int Standard Electric Corp | Pulse time demodulator system |
| US2523279A (en) * | 1943-04-07 | 1950-09-26 | Int Standard Electric Corp | Multiplex high-frequency electrical pulse signaling system |
| US2524789A (en) * | 1946-07-27 | 1950-10-10 | Standard Telephones Cables Ltd | Multichannel time modulated pulse receiving system |
| US2540876A (en) * | 1943-09-16 | 1951-02-06 | Rca Corp | Pulse communication system |
| US2541019A (en) * | 1946-07-27 | 1951-02-13 | Fed Telecomm Lab Inc | Demodulator system |
| US2541076A (en) * | 1944-08-07 | 1951-02-13 | Standard Telephones Cables Ltd | Multichannel pulse communicating system |
| US2543015A (en) * | 1945-09-27 | 1951-02-27 | Standard Telephones Cables Ltd | Receiver circuit |
| US2546972A (en) * | 1945-03-17 | 1951-04-03 | Int Standard Electric Corp | Television synchronizing system |
| US2550821A (en) * | 1943-01-07 | 1951-05-01 | Pye Ltd | Combined television and sound system |
| US2563684A (en) * | 1945-07-14 | 1951-08-07 | Pye Ltd | Sound on sync separation system |
| US2567203A (en) * | 1946-02-05 | 1951-09-11 | Marcel J E Golay | Multiplex communication system utilizing successive, different pulse modulation techniques |
| US2568213A (en) * | 1947-04-03 | 1951-09-18 | Bendix Aviat Corp | Pulse-width demodulator |
| US2570013A (en) * | 1948-07-16 | 1951-10-02 | Hartford Nat Bank & Trust Co | Frequency discriminator |
| US2570188A (en) * | 1949-04-09 | 1951-10-09 | Zenith Radio Corp | Subscription signaling system |
| US2585803A (en) * | 1945-04-18 | 1952-02-12 | Us Sec War | Pulse width discriminator circuit |
| US2589100A (en) * | 1946-01-08 | 1952-03-11 | Pye Ltd | Television receiver with sound recurring as pulses during blanking periods |
| US2613236A (en) * | 1946-08-09 | 1952-10-07 | Palevsky Harry | Voltage measuring apparatus |
| US2617027A (en) * | 1945-09-28 | 1952-11-04 | Hartford Nat Bank & Trust Co | Pulse-time demodulator |
| US2624797A (en) * | 1945-10-12 | 1953-01-06 | Pye Ltd | Television system |
| US2627575A (en) * | 1950-02-18 | 1953-02-03 | Bell Telephone Labor Inc | Semiconductor translating device |
| US2629856A (en) * | 1949-12-19 | 1953-02-24 | Fed Telecomm Lab Inc | Ptm modulator and demodulator system |
| US2633538A (en) * | 1947-10-31 | 1953-03-31 | Rca Corp | Beam deflection control |
| US2647944A (en) * | 1946-11-26 | 1953-08-04 | American Optical Corp | Single carrier transmission of sound and video signals |
| US2653184A (en) * | 1948-01-03 | 1953-09-22 | American Optical Corp | Transmission of picture and sound on the same carrier |
| US2654833A (en) * | 1948-03-03 | 1953-10-06 | Pye Ltd | Radar beacon transmitter |
| US2677761A (en) * | 1945-11-26 | 1954-05-04 | Us Navy | Communication system |
| US2721899A (en) * | 1946-07-25 | 1955-10-25 | Gen Dynamics Corp | Pulse communication system |
| US2744196A (en) * | 1945-10-09 | 1956-05-01 | Conrad H Hoeppner | Pulse width discriminator |
| US2750563A (en) * | 1945-11-29 | 1956-06-12 | David F Winter | Time jitter measuring system |
| US2771554A (en) * | 1950-04-11 | 1956-11-20 | Gratzl Kurt | Impulse generator for medical use |
| US2776370A (en) * | 1952-06-27 | 1957-01-01 | Harold N Beveridge | Pulse width discriminator |
| US2915746A (en) * | 1952-11-11 | 1959-12-01 | Philips Corp | Radar relay for transmitting radar images |
| US3071649A (en) * | 1946-06-19 | 1963-01-01 | Bell Telephone Labor Inc | Cipher system for pulse code modulation communication system |
| US3087152A (en) * | 1948-07-01 | 1963-04-23 | Aircraft Radio Corp | Radar beacon receiver for positionmodulated pulse signals |
| US3393363A (en) * | 1963-10-07 | 1968-07-16 | Forster Ind Inc | Amplifying means employing pulse width modulation |
| US5327238A (en) * | 1992-11-10 | 1994-07-05 | Chou Wayne W | Method and apparatus for modulating a separated television horizontal sync pulse as a subcarrier of audio information |
-
1943
- 1943-05-29 US US488969A patent/US2391776A/en not_active Expired - Lifetime
Cited By (53)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2550821A (en) * | 1943-01-07 | 1951-05-01 | Pye Ltd | Combined television and sound system |
| US2523279A (en) * | 1943-04-07 | 1950-09-26 | Int Standard Electric Corp | Multiplex high-frequency electrical pulse signaling system |
| US2540876A (en) * | 1943-09-16 | 1951-02-06 | Rca Corp | Pulse communication system |
| US2489948A (en) * | 1943-09-17 | 1949-11-29 | Cossor Ltd A C | Radio receiving system |
| US2513291A (en) * | 1943-10-19 | 1950-07-04 | Standard Telephones Cables Ltd | Multiplex pulse time demodulator |
| US2502213A (en) * | 1944-03-24 | 1950-03-28 | Rca Corp | Intelligence transmission system |
| US2510987A (en) * | 1944-05-26 | 1950-06-13 | Int Standard Electric Corp | Multiplex time modulated electrical pulse demodulation system |
| US2489302A (en) * | 1944-05-26 | 1949-11-29 | Int Standard Electric Corp | Multichannel time modulated electrical pulse communication system |
| US2421025A (en) * | 1944-07-29 | 1947-05-27 | Standard Telephones Cables Ltd | Demodulator system |
| US2541076A (en) * | 1944-08-07 | 1951-02-13 | Standard Telephones Cables Ltd | Multichannel pulse communicating system |
| US2477625A (en) * | 1944-08-25 | 1949-08-02 | Standard Telephones Cables Ltd | Multiplex television and pulse modulated sound system |
| US2522110A (en) * | 1944-12-21 | 1950-09-12 | Philco Corp | Pulse detector system |
| US2517618A (en) * | 1945-02-19 | 1950-08-08 | Standard Telephones Cables Ltd | Detector for time modulated pulses |
| US2510983A (en) * | 1945-02-23 | 1950-06-13 | Standard Telephones Cables Ltd | Radio receiver |
| US2445775A (en) * | 1945-03-05 | 1948-07-27 | Standard Telephones Cables Ltd | Pulse time modulation multiplex receiver |
| US2546972A (en) * | 1945-03-17 | 1951-04-03 | Int Standard Electric Corp | Television synchronizing system |
| US2585803A (en) * | 1945-04-18 | 1952-02-12 | Us Sec War | Pulse width discriminator circuit |
| US2486498A (en) * | 1945-04-20 | 1949-11-01 | Rca Corp | Means for preventing cross talk in sound-vision systems |
| US2563684A (en) * | 1945-07-14 | 1951-08-07 | Pye Ltd | Sound on sync separation system |
| US2513308A (en) * | 1945-09-01 | 1950-07-04 | Standard Telephones Cables Ltd | Electrical time modulated pulse communication system |
| US2543015A (en) * | 1945-09-27 | 1951-02-27 | Standard Telephones Cables Ltd | Receiver circuit |
| US2617027A (en) * | 1945-09-28 | 1952-11-04 | Hartford Nat Bank & Trust Co | Pulse-time demodulator |
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