Non-linear sync signal processing circuit

Details Non-linear sync signal processing circuit Non-linear sync signal processing circuit

1984-05-16

1987-10-27

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, 358153, 328108, 3281291, 328139, 328179, 307234, H04N 504

Patent

active

047033541

ABSTRACT:
A non-linear sync signal processor for deriving a sync-like signal from video information with suppressed sync signals includes a differentiating circuit for deriving pulse potentials from the leading and trailing edges of suppressed sync signals, a pair of comparators for generating signals corresponding to the pulse potentials and a pair of non-retriggerable monostable timers, one for creating a 6 microsecond first window in response to a leading edge and the other for creating a 58 microsecond second window in response to a trailing edge occurring in the first window. The second timer is enabled by operation of the first timer and the first timer is inhibited during operation of the second timer. Thus only sync-like signals having three characteristics of conventional sync signals are regenerated.

REFERENCES:
patent: 3553365 (1971-01-01), Jauernik
patent: 3903356 (1975-09-01), Watatani et al.
patent: 4095258 (1978-06-01), Sperber
patent: 4523228 (1985-06-01), Banker

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