AGC keying signal circuit

Details AGC keying signal circuit AGC keying signal circuit

1978-08-18

1980-07-15

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 552

Patent

active

042131510

ABSTRACT:
An automatic gain control keying signal circuit is provided for generating an automatic gain control (AGC) keying signal for a television AGC circuit. A keying signal is produced upon the normal coincidence of a sync pulse from the sync separator and a horizontal retrace pulse from the horizontal deflection system in a television receiver. The keying signal begins upon coincidence of the sync pulse and the horizontal retrace pulse and ends upon termination of the retrace pulse, thereby producing a keying signal pulse of substantially constant time duration, irrespective of the duration of the sync pulse. According to a further aspect of the invention, an "out-of-lock" signal is produced upon the occurrence of a horizontal retrace pulse which is not in coincidence with a sync pulse.

REFERENCES:
patent: 3624290 (1971-11-01), Hofmann
patent: 3740471 (1973-06-01), Wilcox

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