H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/9, 352/10.5
H04N 1/40 (2006.01) H04N 1/407 (2006.01) H04N 5/76 (2006.01)
Patent
CA 1132241
ABSTRACT OF THE DISCLOSURE Video input circuits are disclosed for a video hard copy controller of the type that converts and formats video signals into digital signals for application to a hard copy generating device. The video input circuits comprise a video amplifier circuit having input terminals for receiving a composite video signal comprised of a video data component and a synchronization component, control terminals for receiving a gain control signal to control the gain of the amplifier-circuit, and output terminals at which an amplified composite video signal is developed. An automatic gain control circuit is coupled in feedback relation between the output and control terminals of the amplifier circuit for generating the gain control signal to control the gain of the video amplifier such that, in said amplified composite video signal, the potential difference between first and second portions of the synchronization component thereof substantially constant. A d-c restorer circuit is coupled to the output of the video amplifier circuit for maintaining the first portion of the synchronization component in a predetermined relationship with respect to a predetermined reference potential.
306083
Koch Kenneth F.
Wessler Louis E.
Sim & Mcburney
Xerox Corporation
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