Video processing circuit with IF AGC loop, auxiliary video clamp

Details Video processing circuit with IF AGC loop, auxiliary video clamp Video processing circuit with IF AGC loop, auxiliary video clamp

1992-09-17

1994-08-30

Powell, Mark R.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348694, 348695, H04N 552, H04N 516

Patent

active

053432550

ABSTRACT:
A clamp system for use in a television receiver having tuner and auxiliary video sources, comprises an IF AGC and video detector circuit having an AGC reference voltage input and an auxiliary video input signal clamp circuit having a reference voltage input. The detector circuit and the clamp circuit are each formed on a common integrated circuit along with a video switch for selecting video signals provided by said detector and clamp circuits. The integrated circuit further includes a reference voltage source and a bias generator for deriving the AGC reference voltage and the auxiliary input signal clamp voltage from the common source.

REFERENCES:
patent: 4162451 (1979-07-01), Arh
patent: 4301474 (1981-11-01), Jurgensen et al.
patent: 4660084 (1987-04-01), Filliman et al.
patent: 4660085 (1987-04-01), Harwood et al.
patent: 4663668 (1987-05-01), Rabii et al.
patent: 4965669 (1990-10-01), Canfield et al.

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