Patent US3865973A successfully refreshed from Google Patents.
US3865973A
Expired / Lapsed
US
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Still picture broadcasting receiver
Assignee: Hitachi Ltd
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Filing: 1973-05-18
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Granted: 1975-02-11
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Expires: 1993-05-18
Abstract
Abstract A receiver for a composite signal consisting of video and audio multiplex signals intermittently transmitted in a predetermined sequence and having synchronizing signals with a blanking period and different repetition frequencies in the video signal period and the audio multiplex signal period, wherein the synchronizing signals are so composed as to have an identical mode at least for a part thereof at a common measure frequency of the two different repetition frequencies. The receiver comprises a gate circuit, a coincidence circuit for producing a coincidence signal when a signal having a mode identical with the mode of the synchronizing signal at the common measure frequency is supplied, a coincidence confirming circuit having a certain level exceeding a predetermined level when said coincidence signal is supplied regularly, a means for producing first and second signals having a phase controlled by said coincidence signal and having said two repetition frequencies respectively and a third signal having frequency of the common measure or common multiple frequency of said two repetition frequencies, and a means for operating a gate circuit by said third signal only when a coincidence confirming signal is supplied and for controlling said gate circuit to pass the composite signal during a period. The receiver further comprises means for detecting a blanking period by said third signal and a means for controlling gain of the receiver in accordance with the detected level. The receiver still further comprises means for fixing the level of the blanking period by using a part of the blanking period a predetermined fixed level.
Inventors
- 👤 Michio Masuda
- 👤 Katsuo Mohri
- 👤 Hiroaki Nabeyama
- 👤 Teruhiro Takezawa
- 👤 Hisakichi Yamane
- 👤 Eiichi Sawabe
- 👤 Akio Yanagimachi
- 👤 Takashi Uehara
- 👤 Takehiko Yoshino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:25
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/16; H04J3/1605; H04N; H04N1/00; H04N1/00095; H04N1/00098
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
181 words
A receiver for receiving a composite signal having a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical coded mode are supplied, and a synchronizing signal generator means which is controlled by said coincidence signal for generating signals having the two repetition frequencies and phases of said two pulse coded synchronizing signals so as to reproduce said video signal and audio multiplex signal.
Claim 2
Dependent Claim
181 words
A receiver for receiving a composite signal having a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical coded mode are supplied, and a synchronizing signal generator means which is controlled by said coincidence signal for generating signals having the two repetition frequencies and phases of said two pulse coded synchronizing signals so as to reproduce said video signal and audio multiplex signal.
Claim 3
Dependent Claim
94 words
A receiver as claimed in claim 1, wherein the means for generating signals having said two different repetition frequencies and phases comprises first and second synchronization achieving signal generators for generating signals having a synchronized phase with the coincidence signal when the coincidence signal is supplied, and to produce one of the two signals having repetition frequency of one of said two frequencies from the first synchronization achieving signal generator and to produce the otHer signal having a frequency of the other of the two repetition frequencies from the second synchronization achieving signal generator.
Claim 4
Dependent Claim
163 words
A receiver as claimed in claim 1, wherein the coincidence circuit comprises: a mode generator for producing output pulses having a fixed pulse coded mode which is the same as said identical pulse coded mode, a shift register for transferring each bit of said composite signal supplied to its input terminal and providing output pulses, a comparator, first means for producing pulses by comparing each bit of the output pulses of said shift register and each bit of the output pulses of said mode generator in said comparator when said bit of the pulse coded mode of said composite signal is equal to a corresponding bit of said pulse coded mode of said output pulses of said mode generator, a memory for storing pulses from said first producing means, and second means for producing a coincidence signal at an output of said memory, by storing said pulses in a said memory, when a predetermined number of said pulses are memorized in said memory.
Claim 5
Dependent Claim
196 words
A receiver for receiving a composite signal comprising a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical pulse coded mode are supplied, a first signal generator for generating a signal having one of said two repetition frequencies, a first control means for controlling a phase of the output signal obtained from said first signal generator by the coincidence signal, and a second signal generator for generating a signal having the other frequency of the two repetition frequencies.
Claim 6
Dependent Claim
196 words
A receiver for receiving a composite signal comprising a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical pulse coded mode are supplied, a first signal generator for generating a signal having one of said two repetition frequencies, a first control means for controlling a phase of the output signal obtained from said first signal generator by the coincidence signal, and a second signal generator for generating a signal having the other frequency of the two repetition frequencies.
Claim 7
Dependent Claim
360 words
A receiver for receiving a composite signal comprising a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective blanking periods and respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio mutliplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises; a gate circuit, a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical pulse coded mode are supplied, a coincidence confirming circuit for producing a confirming signal having a level exceeding a predetermined level when said coincidence signal is supplied within a predetermined time interval, a first signal generator for generating a first signal having a frequency of one of said repetition frequencies of said two pulse coded synchronizing signals, a means for controlling a phase of the first signal generated from said first signal generator by said coincidence signal, a second signal generator for generating a second signal having a frequency of the other one of said two repetition frequencies of said two pulse coded synchronizing signals, a means for controlling a phase of said second signal generated from said second signal generator by said coincidence signal, a third signal generator for generating a third signal having a frequency of a common measure or common multiple frequency of the two repetition frequencies of said first signal and of said second signal, and a means for controlling said gate circuit by supplying said confirming signal and the third signal to said gate circuit and to operate the gate circuit by the third signal only when the confirming signal has a level exceeding a predetermined level and to control said gate circuit to pass said composite signal in the other instances.
Claim 8
Dependent Claim
360 words
A receiver for receiving a composite signal comprising a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective blanking periods and respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio mutliplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises; a gate circuit, a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical pulse coded mode are supplied, a coincidence confirming circuit for producing a confirming signal having a level exceeding a predetermined level when said coincidence signal is supplied within a predetermined time interval, a first signal generator for generating a first signal having a frequency of one of said repetition frequencies of said two pulse coded synchronizing signals, a means for controlling a phase of the first signal generated from said first signal generator by said coincidence signal, a second signal generator for generating a second signal having a frequency of the other one of said two repetition frequencies of said two pulse coded synchronizing signals, a means for controlling a phase of said second signal generated from said second signal generator by said coincidence signal, a third signal generator for generating a third signal having a frequency of a common measure or common multiple frequency of the two repetition frequencies of said first signal and of said second signal, and a means for controlling said gate circuit by supplying said confirming signal and the third signal to said gate circuit and to operate the gate circuit by the third signal only when the confirming signal has a level exceeding a predetermined level and to control said gate circuit to pass said composite signal in the other instances.
Claim 9
Dependent Claim
36 words
A receiver as claimed in claim 5, wherein the third signal generator comprises an AND gate which produces the third signal at its output when the first and second signals are supplied to its input terminals.
Claim 10
Dependent Claim
80 words
A receiver as claimed in claim 5, wherein the receiver further comprises an automatic gain control device having, means for obtaining a third signal having a common measure frequency of the two repetition frequencies from said first and second signals, a gate circuit, a means for detecting the signal level of a blanking period of a synchronizing signal by controlling said gate circuit by the third signal, and a means for controlling gain of the receiver by the detected signal.
Claim 11
Dependent Claim
162 words
A receiver as claimed in claim 5, wherein the coincidence circuit comprises: a mode generator for producing output pulses having a fixed pulse coded mode which is the same as said identical pulse coded mode, a shift register for transferring each bit of said composite signal supplied to its input terminal and providing output pulses, a comparator, first means for producing pulses by comparing each bit of the output pulses of said shift register and each bit of the output pulses of said mode generator in said comparator when said bit of the pulse coded mode of said composite signal is equal to a corresponding bit of said pulse coded mode of said output signals of said mode generator, a memory for storing pulses from said first producing means, and second means for producing a coincidence signal at an output of said memory, by storing said pulses in said memory, when a predetermined number of said pulses are memorized in said memory.
Claim 12
Dependent Claim
73 words
A receiver as claimed in claim 5, wherein the receiver further comprises a clamp circuit having, a means for obtaining a third signal having a frequency of a common measure frequency of said two repetition frequencies of said first and second signals by using said first and second signals, and a means for fixing the level of the blanking period of said composite signal at a predetermined voltage by using said third signal.
Claim 13
Dependent Claim
258 words
A receiver for receiving a composite signal including a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective blanking period and respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a synchronizing signal regererator having, a. a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical pulse coded mode are supplied, b. a means for producing first and second signals having two repetition frequencies, respectively, and having a controlled phase by said coincidence signal, an automatic gain control device including, a. a means for obtaining a third signal having a common measure frequency of said two repetition frequencies of said first and second signals from said first and second signals, b. a gate circuit, c. a means for detecting the level of said composite signal in a blanking period by controlling said gate circuit by the third signal and for producing a detected signal, and d. a means for controlling gain of the receiver by said detected signal.
Claim 14
Dependent Claim
258 words
A receiver for receiving a composite signal including a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective blanking period and respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a synchronizing signal regererator having, a. a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical pulse coded mode are supplied, b. a means for producing first and second signals having two repetition frequencies, respectively, and having a controlled phase by said coincidence signal, an automatic gain control device including, a. a means for obtaining a third signal having a common measure frequency of said two repetition frequencies of said first and second signals from said first and second signals, b. a gate circuit, c. a means for detecting the level of said composite signal in a blanking period by controlling said gate circuit by the third signal and for producing a detected signal, and d. a means for controlling gain of the receiver by said detected signal.
Claim 15
Dependent Claim
244 words
A receiver for receiving a composite signal including a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective blanking periods and respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a synchronizing signal regenerator including, a. a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical pulse coded mode are supplied, b. a means for producing first and second signals having frequencies which are the same as the two repetition frequencies of said pulse coded synchronizing signals, respectively, and having phases synchronized with said coincidence signal, a clamp circuit having, a. a means for obtaining a third signal having a common measure frequency of said two repetition frequencies of said first and second signals from said first and second signals, and b. a means for fixing the level of a blanking period of said composite signal at a predetermined voltage by said third signal.
Claim 16
Dependent Claim
244 words
A receiver for receiving a composite signal including a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective blanking periods and respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a synchronizing signal regenerator including, a. a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical pulse coded mode are supplied, b. a means for producing first and second signals having frequencies which are the same as the two repetition frequencies of said pulse coded synchronizing signals, respectively, and having phases synchronized with said coincidence signal, a clamp circuit having, a. a means for obtaining a third signal having a common measure frequency of said two repetition frequencies of said first and second signals from said first and second signals, and b. a means for fixing the level of a blanking period of said composite signal at a predetermined voltage by said third signal.
Claim 17
Dependent Claim
268 words
A receiver for receiving a composite signal including a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective blanking periods and respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical pulse coded mode are supplied, a means for producing first and second signals having frequencies which are the same as said two repetition frequencies of said pulse coded synchronizing signals and having phases synchronized with said coincidence signal, a means for producing a third signal having a frequency of a common measure frequency of said two repetition frequencies of said first and second signals from first and second signals, a gate circuit, a means for detecting the signal level of a blanking period by controlling the gate by said third signal and for producing a detected signal, a means for controlling gain of the receiver by the detected signal, and a means for fixing the level of said blanking period of said composite signal at a predetermined voltage.
Claim 18
Dependent Claim
268 words
A receiver for receiving a composite signal including a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective blanking periods and respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical pulse coded mode are supplied, a means for producing first and second signals having frequencies which are the same as said two repetition frequencies of said pulse coded synchronizing signals and having phases synchronized with said coincidence signal, a means for producing a third signal having a frequency of a common measure frequency of said two repetition frequencies of said first and second signals from first and second signals, a gate circuit, a means for detecting the signal level of a blanking period by controlling the gate by said third signal and for producing a detected signal, a means for controlling gain of the receiver by the detected signal, and a means for fixing the level of said blanking period of said composite signal at a predetermined voltage.
Claim 19
Dependent Claim
314 words
A receiver for a composite signal including a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a gate circuit, a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical pulse coded mode are supplied, a basic oscillator, a first frequency converter for producing a first signal having a frequency corresponding to one of said two repetition frequencies of said pulse coded synchronizing signals at an output terminal when the output signal of the basic oscillator is supplied to its input terminal, a second frequency converter for producing a second signal having a frequency corresponding to the other one of said two repetition frequencies of said pulse coded synchronizing signals at an output terminal when the output signal of the basic oscillator is supplied to its input terminal, a means for synchronizing phases of the first and second signals with the phase of said coincidence signal in said first and second frequency converters, an AND gate, a means for obtaining a third signal at an output terminal of the AND gate by supplying the first and second signals to input terminals of the AND gate, and a means for gating said synchronizing signals from the composite signal by supplying the third signal to the gate circuit.
Claim 20
Dependent Claim
314 words
A receiver for a composite signal including a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a gate circuit, a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having said identical pulse coded mode are supplied, a basic oscillator, a first frequency converter for producing a first signal having a frequency corresponding to one of said two repetition frequencies of said pulse coded synchronizing signals at an output terminal when the output signal of the basic oscillator is supplied to its input terminal, a second frequency converter for producing a second signal having a frequency corresponding to the other one of said two repetition frequencies of said pulse coded synchronizing signals at an output terminal when the output signal of the basic oscillator is supplied to its input terminal, a means for synchronizing phases of the first and second signals with the phase of said coincidence signal in said first and second frequency converters, an AND gate, a means for obtaining a third signal at an output terminal of the AND gate by supplying the first and second signals to input terminals of the AND gate, and a means for gating said synchronizing signals from the composite signal by supplying the third signal to the gate circuit.
Claim 21
Dependent Claim
34 words
A receiver as claimed in claim 13, wherein the receiver further comprises a means for controlling the oscillating frequency of the basic oscillator and phase thereof by using a part of a synchronizing signal.
Claim 22
Dependent Claim
162 words
A receiver as claimed in claim 13, wherein the coincidence circuit comprises: a mode generator for producing output pulses having a fixed pulse coded mode which is the same as said identical pulse coded mode, a shift register for transferring each bit of said composite signal supplied to its input terminal and providing output pulses, a comparator, first means for producing pulses by comparing each bit of the output pulses of said shift register and each bit of the output pulses of said mode generator in said comparator when said bit of the pulse coded mode of said composite signal is equal to a corresponding bit of said pulse coded mode of said output signals of said mode generator, a memory for storing pulses from said first producing means, and second means for producing a coincidence signal at an output of said memory, by storing said pulses in said memory, when a predetermined number of said pulses are memorized in said memory.
Claim 23
Dependent Claim
422 words
A receiver for receiving a composite signal including a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a gate circuit, a coincidence circuit having first and second output terminals for producing a first coincidence signal at the first terminal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulses having said identical pulse coded mode are supplied, and for producing a second coincidence signal at the second terminal having a first frequency which is the same as the frequency of said pulse coded synchronizing signal in said video signal period when said pulse coded synchronizing signal inserted in said video signal is supplied and having a second frequency which is the same as the frequency of said pulse coded synchronizing signal in said audio multiplex signal period when said pulse coded synchronizing signal inserted in said audio multiplex signal is supplied, a basic oscillator, a first frequency converter for producing a first signal having a frequency of one of said two repetition frequencies at an output terminal when an output signal of the basic oscillator is applied to its input terminal, a second frequency converter for producing a second signal having a frequency of the other one of said two repetition frequencies at an output terminal when an output signal of the basic oscillator is applied to its input terminal, a third frequency converter for producing a third signal having a frequency corresponding to a common measure frequency of said two repetition frequencies at an output terminal when an output signal of the basic oscillator is supplied to its input terminal, a means for controlling phases of the first and second signals by supplying the first coincidence signal to the first and second frequency converters, a means for controlling the phase of the third signal by supplying the second coincidence signal to the third frequency converter, and a means for gating a synchronizing signal from the composite signal by supplying the third signal to said gate circuit.
Claim 24
Dependent Claim
422 words
A receiver for receiving a composite signal including a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and in the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a gate circuit, a coincidence circuit having first and second output terminals for producing a first coincidence signal at the first terminal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulses having said identical pulse coded mode are supplied, and for producing a second coincidence signal at the second terminal having a first frequency which is the same as the frequency of said pulse coded synchronizing signal in said video signal period when said pulse coded synchronizing signal inserted in said video signal is supplied and having a second frequency which is the same as the frequency of said pulse coded synchronizing signal in said audio multiplex signal period when said pulse coded synchronizing signal inserted in said audio multiplex signal is supplied, a basic oscillator, a first frequency converter for producing a first signal having a frequency of one of said two repetition frequencies at an output terminal when an output signal of the basic oscillator is applied to its input terminal, a second frequency converter for producing a second signal having a frequency of the other one of said two repetition frequencies at an output terminal when an output signal of the basic oscillator is applied to its input terminal, a third frequency converter for producing a third signal having a frequency corresponding to a common measure frequency of said two repetition frequencies at an output terminal when an output signal of the basic oscillator is supplied to its input terminal, a means for controlling phases of the first and second signals by supplying the first coincidence signal to the first and second frequency converters, a means for controlling the phase of the third signal by supplying the second coincidence signal to the third frequency converter, and a means for gating a synchronizing signal from the composite signal by supplying the third signal to said gate circuit.
Claim 25
Dependent Claim
254 words
A receiver for receiving a composite signal including a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a gate circuit, a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having identical pulse coded mode are supplied, a first oscillator for producing a first signal having a frequency of one of said two repetition frequencies, a second oscillator for producing a second signal having a frequency of the other one of said two repetition frequencies, a means for controlling phases of said first and second signals by supplying said coincidence signal to the first and second oscillators, an AND gate, a means for obtaining a third signal at the output of the AND gate by supplying the first and second signals to input terminals of the AND gate, and a means for gating a synchronizing signal from the composite signal by supplying said third signal to the gate circuit.
Claim 26
Dependent Claim
254 words
A receiver for receiving a composite signal including a video signal and an audio multiplex signal transmitted alternately in a predetermined sequence, the video signal and the audio multiplex signal including respective pulse coded synchronizing signals having different repetition frequencies in the video signal transmission period and the audio multiplex signal transmission period wherein parts of the two pulse coded synchronizing signals inserted in said video signal and said audio multiplex signal have an identical pulse coded mode at a common measure frequency of the two repetition frequencies of said pulse coded synchronizing signals, wherein the receiver comprises: a gate circuit, a coincidence circuit for generating a coincidence signal having a frequency of the common measure frequency of said different repetition frequencies of said two pulse coded synchronizing signals when said pulse coded synchronizing signals having identical pulse coded mode are supplied, a first oscillator for producing a first signal having a frequency of one of said two repetition frequencies, a second oscillator for producing a second signal having a frequency of the other one of said two repetition frequencies, a means for controlling phases of said first and second signals by supplying said coincidence signal to the first and second oscillators, an AND gate, a means for obtaining a third signal at the output of the AND gate by supplying the first and second signals to input terminals of the AND gate, and a means for gating a synchronizing signal from the composite signal by supplying said third signal to the gate circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |