Keying signal generator responsive to plural input signals

Details Keying signal generator responsive to plural input signals Keying signal generator responsive to plural input signals

1980-07-02

1981-10-13

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358168, 358 20, 358 33, 358 34, 358 86, H04N 324, H04N 518, H04N 946, H04N 9535

Patent

active

042951631

ABSTRACT:
A television receiver including a video signal sync separator and keyed signal processing circuits responsive to keying signals supplied by a keying signal generator is disclosed. The output of the sync separator is filtered to develop a bias voltage with a magnitude in accordance with the average output level of the sync separator. The keying signal generator provides periodically timed output keying signals in response to locally generated periodic horizontal flyback signals. The operation of the keying signal generator is enabled or disabled in response to the magnitude of the bias voltage derived from the sync separator output.

REFERENCES:
patent: 4197557 (1980-04-01), Tuma et al.

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