Automatic gain control circuit for stabilizing the level of a re

Details Automatic gain control circuit for stabilizing the level of a re Automatic gain control circuit for stabilizing the level of a re

1994-01-13

1996-04-23

Groody, James J.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348609, 348255, H04N 552

Patent

active

055108539

ABSTRACT:
An automatic gain control circuit for processing a reproduced color signal in a VCR which may include first and second feedback loops respectively positioned before and after a comb filter. In the first feedback loop, the color signal is amplified by a first variable gain amplifier and supplied to both a first burst detector and the comb filter via a frequency converter and a band-pass filter. The first burst detector detects the peak level of the burst signal included in the color signal and controls the gain of the first amplifier for stabilizing the level of the burst signal. The comb filter removes cross-talk components from the color signal and supplies an output signal to the second feedback loop. In the second feedback loop, the output signal is amplified by a second variable gain amplifier and supplied to a second burst detector. The second burst detector detects the level of the burst signal included in the output signal and controls the gain of the second amplifier for stabilizing the level of the output signal.

REFERENCES:
patent: 4524380 (1985-06-01), Shibata et al.
patent: 4969033 (1990-11-01), Yamada et al.
patent: 4989074 (1991-01-01), Matsumoto

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