D.C.-coupled video clamping circuit

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

1986-10-30

1987-08-18

Chin, Tommy P.

Cryptography

Key management

Having particular key generator

358171, H04N 518

Patent

active

046880976

ABSTRACT:
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.

REFERENCES:
patent: 3557305 (1971-01-01), Dann
patent: 3582545 (1971-06-01), Thorpe
patent: 3750038 (1973-07-01), Meise
patent: 4389671 (1983-06-01), Posner

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