Synchronization apparatus with variable window width and spacing

Details Synchronization apparatus with variable window width and spacing Synchronization apparatus with variable window width and spacing

1978-11-29

1980-04-01

Pitts, Harold I.

Communications: electrical

Digital comparator systems

340147SY, H04Q 900

Patent

active

041964160

ABSTRACT:
A transmitter transmits a sequence of synchronization signals at a predetermined repetition rate and at least one synchronization signal at a spacing in time different from said synchronization signals to signify the start of the message. At the receiver, a window is generated and the locally generated synchronization signal is retimed every time a received synchronization signal falls outside of the window. The window is generated by a counter which controls a flip-flop. To compensate for jitter in the received synchronization signal and yet maintain the window as narrow as possible, the size of the window is decreased from a maximum at the beginning of the message and the position in time of the window relative to a center position at which a jitter-free synchronization pulse would be received is varied as a function of the number of received synchronization signals.

REFERENCES:
patent: 3903504 (1975-09-01), Rogers

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