D.c.-coupled video clamping circuit

Details D.c.-coupled video clamping circuit D.c.-coupled video clamping circuit

H - Electricity

04

N

350/20, 330/28

H04N 7/16 (2006.01) H04N 5/18 (2006.01) H04N 7/171 (2006.01)

Patent

CA 1265609

ABSTRACT OF THE DISCLOSURE A d.c.-coupled video clamping circuit is disclosed for operation with normal video signals and sync suppressed scrambled video signals. For receiving normal video signals, a feedback path detects variations in sync tip level from a reference level and applies a corresponding control voltage to a d.c. signal amplifier, thereby to clamp and maintain the sync tip at a fixed (black) level. For receiving sync suppressed scrambled video signals, the feedback path is disabled and a fixed reference voltage is applied to the d.c. signal amplifier.

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