Gain control device of video signal reproducing apparatus

Details Gain control device of video signal reproducing apparatus Gain control device of video signal reproducing apparatus

1974-06-04

1976-04-06

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 27, H04N 576, H04N 9535

Patent

active

039494144

ABSTRACT:
A gain control circuit for a video signal reproducing apparatus provides a variable gain circuit in the reproduced video signal path and an amplitude detector circuit to which a pilot signal separated from the reproduced video signals is applied. The gain control circuit has N series circuits, each consisting of a series-connected capacitor and a switching element, each of the series circuits corresponding to one of the transducers of the video signal reproducing apparatus. The series circuits are connected to form a parallel circuit across which is applied an output signal from the amplitude detector circuit to supply a gain control signal to the variable gain circuit. Further, each switching element of the series circuits is controlled to be conductive only during the intervals during which a reproduced video signal is obtained from a corresponding rotary head.

REFERENCES:
patent: 3381083 (1968-04-01), Jensen et al.
patent: 3501585 (1970-03-01), De Lange
patent: 3541237 (1970-11-01), Dillenburger
patent: 3585280 (1971-06-01), McMann, Jr.
patent: 3702374 (1972-11-01), Numakura
patent: 3717721 (1973-02-01), Makara et al.
patent: 3732361 (1973-05-01), Makara
patent: 3852808 (1974-12-01), Sadashige

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