Automatic gain control circuit for reproduced signals.

摘要

An automatic gain control circuit for processing a reproducing color signal in a VCR which includes first (51) and second (53) feedback loops respectively positioned before and after a comb filter (39). In the first feedback loop (51), the color signal (CS) is amplified by a first variable gain amplifier (31) and supplied to both a first burst (37) detector and the comb filter (39) via a frequency converter (33) and a band-pass filter (35). The first burst detector (37) detects the peak level of the burst signal included in the color signal (CS) and controls the gain of the first amplifier (31) for stabilizing the level of the burst signal. The comb filter (39) removes cross-talk components from the color signal (CS7) and supplies an output signal (CS8) to the second feedback loop (53). In the second feedback loop, the signal (CS8) is amplified by a second variable gain amplifier (41) and supplied to a second burst detector (43). The second burst detector detects the level of the burst signal included in output signal (CS9) and controls the gains of the second amplifier (41) for stabilizing the level of the output signal (CS9). <IMAGE>