Synchronizing signal regenerator

A synchronizing signal regenerator for regenerating synchronizing signals in a composite signal including a video signal and pulse code modulated audio multiplex signals transmitted in a predetermined sequence, and further including first synchronizing signals having a predetermined number of pulses synchronized with a modulated pulse series of said audio multiplex signals and forming a fixed pulse pattern, and pulse code modulated second synchronizing signals located following said first synchronizing signals and including a plurality of other synchronizing signals required for the reproduction of said video and audio multiplex signals, wherein said first and second synchronizing signals are inserted in said video and audio multiplex signals and transmitted at a predetermined period, the regenerator comprising:

• means for detecting said fixed pulse pattern of said first synchronizing signals and for regenerating a first signal synchronized with said transmitted period of said first synchronizing signals;
• means for detecting predetermined synchronizing signals in said second synchronizing signals which are located in predetermined positions thereof including means for using said regenerated first signal as a reference, and for regenerating second signals each synchronized with said predetermined synchronizing signals;
• means for dividing the frequency of at least one of said regenerated second signals, and for producing a plurality of signals having the same repetition frequency but different phases;
• and
• means for controlling each phase of said plurality of signals having the same repetition frequency with a regenerated signal having a common phase with the rest of the second synchronizing signals to be regenerated.

A synchronizing signal regenerator for regenerating synchronizing signals in a composite signal including a video signal and pulse code modulated audio multiplex signals transmitted in a predetermined sequence, and further including a first synchronizing signal having a predetermined number of pulses synchronized with a modulated pulse series of said audio multiplex signals and forming a fixed pulse pattern, and pulse code modulated second synchronizing signals located following said first synchronizing signals and including two synchronizing signals having repetition frequencies, respectively, of x and y in a relation of x/y=n, wherein n is an integer, and a plurality of synchronizing signals having a repetition frequency equal to y and having a phase difference of 1/n period with respect to each other, these first and second synchronizing signals being required for regenerating said video and audio multiplex signals and being inserted in said video and audio multiplex signals and transmitted at a predetermined period, the regenerator comprising:

• means for detecting said fixed pulse pattern of said first synchronizing signals and for regenerating a first signal synchronized with said transmitted period of said first synchronizing signals;
• means supplied with said first signal as a reference for detecting synchronizing signals having the repetition frequency x from said composite signal, and for regenerating a second signal synchronized with said detected synchronizing signals having repetition frequency x;
• a ring counter for 1/n frequency dividing the frequency of an input signal;
• means for dividing the frequency of said second signal by means of said ring counter so as to produce signals having a repetition frequency equal to y and having their phase shifted by 1/n period with respect to each other;
• and
• means for regenerating signals each synchronized with said second synchronzing signals having a repetition frequency y included in the input composite signal including means for applying said second signal to the ring counter as a reset pulse.

A synchronizing signal regenerator for regenerating synchronizing signals in a composite signal including a video signal and pulse code modulated audio multiplex signals transmitted in a predetermined sequence, and further including a synchronizing pulse series having a predetermined number of pulses synchronized with a modulated pulse series of said audio multiplex signal and forming a fixed pulse pattern, and also a pulse code modulated synchronizing signal group located following said synchronizing pulse series and including a first synchronizing signal having repetition frequency x and a plurality of second pulse code modulated synchronizing signals having repetition frequency y in a relation of y=x/n, wherein n is an integer, and having phases 2.pi./n radians different from each other, and a third synchronizing signal having a repetition frequency which is the same as a common measure frequency of said x and y and having a phase which is the same as that common to one of said second synchronizing signals and the first synchronizing signal, the synchronizing pulse series and synchronizing signal group being inserted in said video and audio multiplex signals and transmitted at a predetermined period, the regenerator comprising:

• a coincidence circuit for producing a coincidence signal when pulses having a pattern which is the same as the fixed pulse pattern of said synchronizing pulse series are applied to an input thereof;
• means for applying said composite signal to said coincidence circuit;
• means for generating a first gating signal including means for shifting the phase of said coincidence signal;
• means for gating said composite signal with said first gating signal so as to reproduce said first synchronizing signal having repetition frequency x;
• a ring counter for dividing the frequency of said reproduced first synchronizing signal into 1/n and for producing a plurality of signals having a phase difference of 2.pi./n radians with respect to each other;
• means for generating a second gating signal including means for shifting the phase of said coincidence signal;
• means for gating said composite signal with said second gating signal so as to reproduce said third synchronizing signal;
• and
• means for reproducing signals having repetition frequency y and synchronized with said plurality of second pulse code modulated synchronizing signals, respectively, including means for supplying said reproduced third synchronizing signal to said ring counter as a reset signal.