Standard/nonstandard internal vertical sync producing apparatus

Details Standard/nonstandard internal vertical sync producing apparatus Standard/nonstandard internal vertical sync producing apparatus

1976-06-25

1978-06-20

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358158, H04N 504

Patent

active

040965287

ABSTRACT:
Apparatus for producing internal vertical sync signals from a source of standard and nonstandard rate external vertical signals. The apparatus includes a counting and reset arrangement for generating internal vertical sync signals in synchronization with the external vertical signals when the external signals are occurring at a standard rate. A nonstandard signal sampling arrangement causes the generation of the internal vertical sync signals in synchronization with the external signals at a nonstandard rate after a predetermined time in which these nonstandard signals occur. Still other circuit elements generate standard rate internal vertical sync signals during the predetermined time in which these nonstandard rate signals occur.

REFERENCES:
patent: 3691297 (1972-09-01), Merrell et al.
patent: 3814855 (1974-06-01), Kokado
patent: 3899635 (1975-08-01), Steckler et al.
patent: 3904823 (1975-09-01), Van Straaten
patent: 3916102 (1975-10-01), Merrell

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