Apparatus for reproducing synchronizing signals

Claim 2

A synchronizing signal reproducing apparatus which receives a composite signal including video and audio signals transmitted in accordance with a predetermined sequence, a first synchronizing signal inserted in said video signal for reproducing it, a second synchronizing signal inserted in said audio signal for reproducing it and having a repetition frequency different from that of said first synchronizing signal, at a common division frequency of said first and second synchronizing signals their phase being coincided with each other, and a third synchronizing signal inserted in at least boundaries between said video and audio signals and having a repetition frequency of 1/n (n is an integer) of said common division frequency of said first and second synchronizing signals and a phase coincided with those of said first and second synchronizing signals, and reproduces all of said first, second and third synchronizing signals comprises means for detecting either one of said first and second synchronizing signals and for reproducing a signal synchronized with the detected synchronizing signal, means for detecting said third synchronizing signal and for reproducing a signal synchronized with the detected third synchronizing signal, and means for reproducing a signal synchronized with the other of said first and second synchronizing signals by means of said reproduced third synchronizing signal.

Claim 3

A synchronizing signal reproducing apparatus which receives a composite signal including video and audio signals transmitted in accordance with a predetermined sequence, a first synchronizing signal inserted in said video signal for reproducing it, a second synchronizIng signal inserted in said audio signal for reproducing it and having a repetition frequency different from that of said first synchronizing signal, at a common division frequency of said first and second synchronizing signals their phase being coincided with each other, and a third synchronizing signal inserted in at least boundaries between said video and audio signals and having a repetition frequency of 1/n ( n is an integer) of said common division frequency of said first and second synchronizing signals and a phase coincided with those of said first and second synchronizing signals, and reproduces all of said first, second and third synchronizing signals comprises a reference oscillator for generating a signal having a repetition frequency which is a common multiple of the repetition frequencies of said three synchronizing signals, first, second and third step down circuits for stepping down the output signal from said reference oscillator to form three signals each of which has the same repetition frequency as that of each of said three synchronizing signals, a first detection means for detecting a predetermined one of said first and second synchronizing signals from said composite signal, means for synchronizing the output signal from said first step down circuit which produces the signal of the same repetition frequency as that of said predetermined synchronizing signals with said detected synchronizing signal by means of the output signal from said first detecting means, a second detection means for detecting said third synchronizing signal from said composite signal, means for synchronizing the output signal from said third step down circuit which generates the signal of the same repetition frequency as that of said third synchronizing signal with said third synchronizing signal by means of the output signal from said second detection means, and means for synchronizing the output signal from said second step down circuit which generates the signal of the same repetition frequency as that of the other of said first and second synchronizing signals with the other of said first and second synchronizing signals by means of the output signal from said third step down circuit.

Claim 4

A synchronizing signal reproducing apparatus which receives a composite signal including video and audio signals transmitted in accordance with a predetermined sequence, a first synchronizing signal inserted in said video signal for reproducing it, a second synchronizIng signal inserted in said audio signal for reproducing it and having a repetition frequency different from that of said first synchronizing signal, at a common division frequency of said first and second synchronizing signals their phase being coincided with each other, and a third synchronizing signal inserted in at least boundaries between said video and audio signals and having a repetition frequency of 1/n ( n is an integer) of said common division frequency of said first and second synchronizing signals and a phase coincided with those of said first and second synchronizing signals, and reproduces all of said first, second and third synchronizing signals comprises a reference oscillator for generating a signal having a repetition frequency which is a common multiple of the repetition frequencies of said three synchronizing signals, first, second and third step down circuits for stepping down the output signal from said reference oscillator to form three signals each of which has the same repetition frequency as that of each of said three synchronizing signals, a first detection means for detecting a predetermined one of said first and second synchronizing signals from said composite signal, means for synchronizing the output signal from said first step down circuit which produces the signal of the same repetition frequency as that of said predetermined synchronizing signals with said detected synchronizing signal by means of the output signal from said first detecting means, a second detection means for detecting said third synchronizing signal from said composite signal, means for synchronizing the output signal from said third step down circuit which generates the signal of the same repetition frequency as that of said third synchronizing signal with said third synchronizing signal by means of the output signal from said second detection means, and means for synchronizing the output signal from said second step down circuit which generates the signal of the same repetition frequency as that of the other of said first and second synchronizing signals with the other of said first and second synchronizing signals by means of the output signal from said third step down circuit.

Claim 5

A synchronizing signal reproducing apparatus which receives a composite signal including a video signal and a pulse code modulated audio multiplexed signal transmitted in accordance with a given sequence, a first synchronizing signal inserted in said video signal for reproducing it and coded by pulses synchronized with a modulated pulse series of said audio multiplexed signal, a second synchronizing signal inserted in said audio multiplexed signal for reproducing it, a repetition frequency of which is different from that of said first synchronizing signal, but a phase of which coincides with that of the first synchronizing signal at a common division of said repetition frequencies of said first and second synchronizing signals, said second synchronizing signal being coded by pulses synchronized with said modulated pulse series of said audio multiplexed signal, and a pulse coded third synchronizing signal inserted at least in boundaries of said video signal and said audio multiplexed signal and having a repetition frequency of 1/n (n is an integer) of said common division frequency at which said first and second synchronizing signals are synchronized with each other, a phase of said third synchronizing signal being synchronized with said first and second synchronizing signals and reproduces all of said first, second third synchronizing signals comprises a reference oscillator for generating a signal having a frequency which is a common division of said three synchronizing signals, first, second and third step down ciricuits for stepping down the output signal from said oscillator to form three signals each of which has a frequency equal to each of the repetition frequencies of said three synchronizing signals, a firSt detection means for detecting a predetermined one of said first and second synchronizing signals from said composite signal, means for synchronizing the output signal from said first step down circuit which produces the signal of the frequency equal to that of the predetermined one of said first and second synchronizing signals with said detected one of said first and second synchronizing signals by means of the output signal from said first detection means, a second detection means for detecting said third synchronizing signal from said composite signal, and means for synchronizing the output from said second step down circuit which produces the signal having the repetition frequency equal to that of the other of said first and second synchronizing signals with said other synchronizing signal by means of the output from said third step down circuit.

Claim 6

A synchronizing signal reproducing apparatus which receives a composite signal including a video signal and a pulse code modulated audio multiplexed signal transmitted in accordance with a given sequence, a first synchronizing signal inserted in said video signal for reproducing it and coded by pulses synchronized with a modulated pulse series of said audio multiplexed signal, a second synchronizing signal inserted in said audio multiplexed signal for reproducing it, a repetition frequency of which is different from that of said first synchronizing signal, but a phase of which coincides with that of the first synchronizing signal at a common division of said repetition frequencies of said first and second synchronizing signals, said second synchronizing signal being coded by pulses synchronized with said modulated pulse series of said audio multiplexed signal, and a pulse coded third synchronizing signal inserted at least in boundaries of said video signal and said audio multiplexed signal and having a repetition frequency of 1/n (n is an integer) of said common division frequency at which said first and second synchronizing signals are synchronized with each other, a phase of said third synchronizing signal being synchronized with said first and second synchronizing signals and reproduces all of said first, second third synchronizing signals comprises a reference oscillator for generating a signal having a frequency which is a common division of said three synchronizing signals, first, second and third step down ciricuits for stepping down the output signal from said oscillator to form three signals each of which has a frequency equal to each of the repetition frequencies of said three synchronizing signals, a firSt detection means for detecting a predetermined one of said first and second synchronizing signals from said composite signal, means for synchronizing the output signal from said first step down circuit which produces the signal of the frequency equal to that of the predetermined one of said first and second synchronizing signals with said detected one of said first and second synchronizing signals by means of the output signal from said first detection means, a second detection means for detecting said third synchronizing signal from said composite signal, and means for synchronizing the output from said second step down circuit which produces the signal having the repetition frequency equal to that of the other of said first and second synchronizing signals with said other synchronizing signal by means of the output from said third step down circuit.

Claim 7

A synchronizing signal reproducing apparatus which receives a composite signal including a video signal and a pulse code modulated audio multiplexed signal transmitted in accordance with a given sequence, a first synchronizing signal inserted in said video signal for reproducing it and coded by pulses synchronized with a modulated pulse series of said audio multiplexed signal, a second synchronizing signal inserted in said audio multiplexed signal for reproducing it, a repetition frequency of which is different from that of said first synchronizing signal, but a phase of which coincides with that of the first synchronizing signal at a common division of said repetition frequencies of said first and second synchronizing signals, said second synchronizing signal being coded by pulses synchronized with said modulated pulse series of said audio multiplexed signal, and a pulse coded third synchronizing signal inserted at least in boundaries of said video signal and said audio multiplexed signal and having a repetition frequency of 1/n (n is an integer) of said common division frequency at which said first and second synchronizing signals are synchronized with each other, a phase of said third synchronizing signal being synchronized with said first and second synchronizing signals and reproduces all of said first, second and third synchronizing signals comprises a reference oscillator for generating a signal having a repetition frequency which is equal to a common division of said three synchronizing signals, a first gate circuit, a first coincidence circuit for receiving said composite signal through said first gate circuit and producing a first coincidence pulse when there is supplied the same pulse series as that constituting a predetermined one of said first and second pulse coded synchronizing signals, a first step down circuit for stepping down the output signal from said reference oscillator to form a signal having the same repetition frequency as that of said predetermined synchronizing signal, means for synchronizing the output signal from said first step down circuit with said predetermined synchronizing signal by means of said first coincidence signal generated by said first coincidence circuit, means for supplying the output signal from said first step down circuit to said first gate circuit and gating the signal supplied to said first gate circuit at a timing of the output signal from said first step down circuit, a first coincidence confirmation circuit for generating a first coincidence confirmation signal having a voltage level higher than a predetermined level as long as said first coincidence signal generated by said first coincidence circuit occurs at a time interval shorter than a predetermined time interval and controlling said first gate circuit in such a manner that if the voltage of said first coincidence confirmation signal is higher than said predetermined level, said first gate circuit is made conductive only when the output signal from said first coincidence circuit is supplied and if the voltage of said first coincidence confirmation signal is lower than said predetermined level, said first gate circuit is made conductive so as to pass all signals, a second gate circuit, a second coincidence circuit for receiving said composite signal applied through said first and second gate circuits and generating a second coincidence signal when the same pulse code as that of said third synchronizing signal is supplied, a second step down circuit for stepping down the output signal from said reference oscillator to generate a signal having the same repetition frequency as that of said third synchronizing signal, means for synchronizing the output signal from said second step down circuit with said third synchronizing signal by means of said second coincidence signal generated by said second coincidence circuit, means for supplying the output signal from said second step down circuit to said second gate circuit and gating the signal passing through said second gate circuit at a timing of the output signal from said second step down circuit, a second coincidence confirmation circuit for generating a second coincidence confirmation signal having a voltage level higher than a predetermined level as long as said second coincidence signal generated by said second coincidence circuit occurs at a time interval shorter than a predetermined time interval and controlling said second gate circuit in such a manner that if the voltage level of said second coincidence confirmation signal is higher than said predetermined level, said second gate circuit is made conductive only when the output signal from said second step down circuit is supplied and if the voltage of said second coincidence confirmation signal is lower than said predetermined level, said second gate circuit is made conductive so as to pass all signals, a third step down circuit for stepping down the output signal from said reference oscillator to generate a signal having the same repetition frequency as that of said other of said first and second synchronizing signals, and means for synchronizing the output signal from said third step down circuit with said other synchronizing signal by means of said output signal from said second step down circuit.

Claim 8

A synchronizing signal reproducing apparatus which receives a composite signal including a video signal and a pulse code modulated audio multiplexed signal transmitted in accordance with a given sequence, a first synchronizing signal inserted in said video signal for reproducing it and coded by pulses synchronized with a modulated pulse series of said audio multiplexed signal, a second synchronizing signal inserted in said audio multiplexed signal for reproducing it, a repetition frequency of which is different from that of said first synchronizing signal, but a phase of which coincides with that of the first synchronizing signal at a common division of said repetition frequencies of said first and second synchronizing signals, said second synchronizing signal being coded by pulses synchronized with said modulated pulse series of said audio multiplexed signal, and a pulse coded third synchronizing signal inserted at least in boundaries of said video signal and said audio multiplexed signal and having a repetition frequency of 1/n (n is an integer) of said common division frequency at which said first and second synchronizing signals are synchronized with each other, a phase of said third synchronizing signal being synchronized with said first and second synchronizing signals and reproduces all of said first, second and third synchronizing signals comprises a reference oscillator for generating a signal having a repetition frequency which is equal to a common division of said three synchronizing signals, a first gate circuit, a first coincidence circuit for receiving said composite signal through said first gate circuit and producing a first coincidence pulse when there is supplied the same pulse series as that constituting a predetermined one of said first and second pulse coded synchronizing signals, a first step down circuit for stepping down the output signal from said reference oscillator to form a signal having the same repetition frequency as that of said predetermined synchronizing signal, means for synchronizing the output signal from said first step down circuit with said predetermined synchronizing signal by means of said first coincidence signal generated by said first coincidence circuit, means for supplying the output signal from said first step down circuit to said first gate circuit and gating the signal supplied to said first gate circuit at a timing of the output signal from said first step down circuit, a first coincidence confirmation circuit for generating a first coincidence confirmation signal having a voltage level higher than a predetermined level as long as said first coincidence signal generated by said first coincidence circuit occurs at a time interval shorter than a predetermined time interval and controlling said first gate circuit in such a manner that if the voltage of said first coincidence confirmation signal is higher than said predetermined level, said first gate circuit is made conductive only when the output signal from said first coincidence circuit is supplied and if the voltage of said first coincidence confirmation signal is lower than said predetermined level, said first gate circuit is made conductive so as to pass all signals, a second gate circuit, a second coincidence circuit for receiving said composite signal applied through said first and second gate circuits and generating a second coincidence signal when the same pulse code as that of said third synchronizing signal is supplied, a second step down circuit for stepping down the output signal from said reference oscillator to generate a signal having the same repetition frequency as that of said third synchronizing signal, means for synchronizing the output signal from said second step down circuit with said third synchronizing signal by means of said second coincidence signal generated by said second coincidence circuit, means for supplying the output signal from said second step down circuit to said second gate circuit and gating the signal passing through said second gate circuit at a timing of the output signal from said second step down circuit, a second coincidence confirmation circuit for generating a second coincidence confirmation signal having a voltage level higher than a predetermined level as long as said second coincidence signal generated by said second coincidence circuit occurs at a time interval shorter than a predetermined time interval and controlling said second gate circuit in such a manner that if the voltage level of said second coincidence confirmation signal is higher than said predetermined level, said second gate circuit is made conductive only when the output signal from said second step down circuit is supplied and if the voltage of said second coincidence confirmation signal is lower than said predetermined level, said second gate circuit is made conductive so as to pass all signals, a third step down circuit for stepping down the output signal from said reference oscillator to generate a signal having the same repetition frequency as that of said other of said first and second synchronizing signals, and means for synchronizing the output signal from said third step down circuit with said other synchronizing signal by means of said output signal from said second step down circuit.

Claim 9

A synchronizing signal reproducing apparatus which receives a composite signal including a video signal and a pulse code modulated audio multiplexed signal transmitted in accordance with a given sequence, a first sychronizing signal inserted in said video signal for reproducing it and coded by pulse synchronized with a modulated pulse series of said audio multiplexed signal, a second synchronizing signal inserted in said audio multiplexed signal for reproducing it, a repetition frequency of which is different from that of said first synchronizing signal, but a phase of which coincides with that of the first synchronizing signal at a common division of said repetition frequencies of said first and second synchronizing signals, said second synchronizing signal being coded by pulses synchronized with said modulated pulse series of said audio multiplexed signal, and a pulse coded third synchronizing signal inserted at least in boundaries of said video signal and said audio multiplexed signal and having a repetition frequency of 1/n (n is an integer) of said common division frequency at which said first and second synchronizing signals are synchronized with each other, a phase of said third synchronizing signal being synchronized with said first and second synchronizing signals and reproduces all of said first, second and third synchronizing signals comprises a reference oscillator for generating a signal having a repetition frequency equal to a common multiple of said three synchronizing signals, a first coincidence circuit for receiving said composite signal and producing a first coincidence signal when the same pulse series as that constituting a predetermined one of said pulse coded first and second synchronizing signals is supplied, a first step down circuit for stepping down the output signal from said reference oscillator to form a signal having the same repetition frequency as that of said predetermined synchronizing signal, a first gate circuit for gating said composite signal by means of the output signal from said first step down circuit, means for supplying said first coincidence signal generated by said first coincidence circuit through said first gate circuit to said first step down circuit and synchronizing the output signal from said first step down circuit with said predetermined synchronizing signal, a first coincidence confirmation circuit for producing a first coincidence confirmation signal having a voltage level which is higher than a predetermined level as long as said first coincidence signal passing through said first gate circuit occurs at a time interval shorter than a predetermined time interval and controlling said first gate circuit in such a manner that if the voltage of said first coincidence confirmation signal is higher than said predetermined level, said first gate circuit is made conductive only when the output signal from said first step down circuit is supplied and if the voltage of said first coincidence confirmation signal is lower than said predetermined level, said gate circuit is made conductive so as to pass all signals, a second coincidence circuit for receiving said composite signal, generating a coincidence pulse when the same pulse series as that constituting said pulse coded third synchronizing signal and producing a second coincidence signal which is a logic product of said coincidence pulse and said first coincidence signal passed through said first gate circuit, a second step down circuit for stepping down the output from said reference oscillator to generate a signal having the same repetition frequency as that of said third repetition frequency, a second gate circuit for gating the input signal by means of the output signal from said second step down circuit, means for supplying said second coincidence signal generated by said second coincidence circuit to said second step down circuit through said second gate circuit and synchronizing the output of said second step down circuit with said third synchronizing signal, a second coincidence confirmation circuit for producing a second coincidence confirmation signal having a voltage level which is higher than a predetermined level as long as said second coincidence signal passing through said second gate circuit occurs at a time interval shorter than a predetermined time interval and controlling said second gate circuit in such a manner that if the voltage of said second coincidence confirmation signal is higher than said predetermined level, said second gate circuit is made conductive only when the output signal from said second step down circuit is supplied and if the voltage of said second coincidence confirmation signal is lower than said predetermined level, said second gate circuit is made conductive so as to pass all signals, a third step down circuit for stepping down the output signal from said reference oscillator to generate a signal having the same repetition frequency as that of the other of said first and second synchronizing signals, and means for synchronizing the output signal from said third step down circuit with said other synchronizing signal by means of the output signal from said second step down circuit.

Claim 10

A synchronizing signal reproducing apparatus which receives a composite signal including a video signal and a pulse code modulated audio multiplexed signal transmitted in accordance with a given sequence, a first sychronizing signal inserted in said video signal for reproducing it and coded by pulse synchronized with a modulated pulse series of said audio multiplexed signal, a second synchronizing signal inserted in said audio multiplexed signal for reproducing it, a repetition frequency of which is different from that of said first synchronizing signal, but a phase of which coincides with that of the first synchronizing signal at a common division of said repetition frequencies of said first and second synchronizing signals, said second synchronizing signal being coded by pulses synchronized with said modulated pulse series of said audio multiplexed signal, and a pulse coded third synchronizing signal inserted at least in boundaries of said video signal and said audio multiplexed signal and having a repetition frequency of 1/n (n is an integer) of said common division frequency at which said first and second synchronizing signals are synchronized with each other, a phase of said third synchronizing signal being synchronized with said first and second synchronizing signals and reproduces all of said first, second and third synchronizing signals comprises a reference oscillator for generating a signal having a repetition frequency equal to a common multiple of said three synchronizing signals, a first coincidence circuit for receiving said composite signal and producing a first coincidence signal when the same pulse series as that constituting a predetermined one of said pulse coded first and second synchronizing signals is supplied, a first step down circuit for stepping down the output signal from said reference oscillator to form a signal having the same repetition frequency as that of said predetermined synchronizing signal, a first gate circuit for gating said composite signal by means of the output signal from said first step down circuit, means for supplying said first coincidence signal generated by said first coincidence circuit through said first gate circuit to said first step down circuit and synchronizing the output signal from said first step down circuit with said predetermined synchronizing signal, a first coincidence confirmation circuit for producing a first coincidence confirmation signal having a voltage level which is higher than a predetermined level as long as said first coincidence signal passing through said first gate circuit occurs at a time interval shorter than a predetermined time interval and controlling said first gate circuit in such a manner that if the voltage of said first coincidence confirmation signal is higher than said predetermined level, said first gate circuit is made conductive only when the output signal from said first step down circuit is supplied and if the voltage of said first coincidence confirmation signal is lower than said predetermined level, said gate circuit is made conductive so as to pass all signals, a second coincidence circuit for receiving said composite signal, generating a coincidence pulse when the same pulse series as that constituting said pulse coded third synchronizing signal and producing a second coincidence signal which is a logic product of said coincidence pulse and said first coincidence signal passed through said first gate circuit, a second step down circuit for stepping down the output from said reference oscillator to generate a signal having the same repetition frequency as that of said third repetition frequency, a second gate circuit for gating the input signal by means of the output signal from said second step down circuit, means for supplying said second coincidence signal generated by said second coincidence circuit to said second step down circuit through said second gate circuit and synchronizing the output of said second step down circuit with said third synchronizing signal, a second coincidence confirmation circuit for producing a second coincidence confirmation signal having a voltage level which is higher than a predetermined level as long as said second coincidence signal passing through said second gate circuit occurs at a time interval shorter than a predetermined time interval and controlling said second gate circuit in such a manner that if the voltage of said second coincidence confirmation signal is higher than said predetermined level, said second gate circuit is made conductive only when the output signal from said second step down circuit is supplied and if the voltage of said second coincidence confirmation signal is lower than said predetermined level, said second gate circuit is made conductive so as to pass all signals, a third step down circuit for stepping down the output signal from said reference oscillator to generate a signal having the same repetition frequency as that of the other of said first and second synchronizing signals, and means for synchronizing the output signal from said third step down circuit with said other synchronizing signal by means of the output signal from said second step down circuit.

Claim 11

A synchronizing signal reproducing apparatus as claimed in claim 3, said reference oscillator comprises means for extracting a pulse series synchronized with said modulated pulse series of said audio multiplexed signal from said composite signal, an oscillator for generating a signal having the same repetition frequency as the bit repetition frequency of said pulse series, and a phase detector for phase-detecting the output signal from said oscillator and said extracted pulse series and synchronizing the output signal from said oscillatOr with said pulse series by feeding back the detected output to said oscillator.

Claim 12

A synchronizing signal reproducing apparatus as claimed in claim 4, said reference oscillator comprises means for extracting a pulse series synchronized with said modulated pulse series of said audio multiplexed signal from said composite signal, an oscillator for generating a signal having the same repetition frequency as the bit repetition frequency of said pulse series, and a phase detector for phase-detecting the output signal from said oscillator and said extracted pulse series and synchronizing the output signal from said oscillator with said pulse series by feeding back the detected output to said oscillator.

Claim 13

A synchronizing signal reproducing apparatus as claimed in claim 5, said reference oscillator comprises means for extracting a pulse series synchronized with said modulated pulse series of said audio multiplexed signal from said composite signal, an oscillator for generating a signal having the same repetition frequency as the bit repetition frequency of said pulse series, and a phase detector for phase-detecting the output signal from said oscillator and said extracted pulse series and synchronizing the output signal from said oscillator with said pulse series by feeding back the detected output to said oscillator.