Television synchronizing signal separating circuit

Details Television synchronizing signal separating circuit Television synchronizing signal separating circuit

1977-06-02

1979-04-03

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358174, H04N 508

Patent

active

041480686

ABSTRACT:
A television receiver has a tuner, an intermediate frequency amplifier, and a detector for recovering a composite signal including horizontal and vertical display synchronization components and picture information. Horizontal display means produce a long-duration trace signal and short-duration retrace signal and a coincidence gated AGC system which is responsive to coincidence of the horizontal retrace signal and horizontal synchronization signal controls the gain of the intermediate frequency amplifier. A combination synchronizing signal separation and AGC lock-out defeat circuit comprises a transistor, having an input electrode DC coupled to the detector, a common electrode coupled to a charge-discharge circuit such that the input-to-common electrode junction of the transistor and the charge-discharge circuit cooperate to establish a bias voltage dependent upon the occurrence and amplitude of the display synchronization signals, and an output electrode DC coupled to the AGC system. An override system response to said bias means overcomes the coincidence requirement of the AGC system to render said AGC operative solely in response to the occurrence of horizontal retrace signals when the bias indicates prolonged absence of sync pulse signals.

REFERENCES:
patent: 3439115 (1969-04-01), Pollak
patent: 3624290 (1971-11-01), Hofmann
patent: 3639780 (1972-02-01), Lovelace
patent: 3697883 (1972-10-01), Wilcox
patent: 3879576 (1975-04-01), Okada et al.

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