Matsushita Electric Industrial Co., Ltd.

Shinich Uchiyama

Tokikazu Matsumoto

Yukio Nakagawa

A chrominance signal processing system includes a variable gain amplifier capable of effecting gain control for amplifying a carrier chrominance signal and an A/D converter for effecting an analog/digital conversion of an output of the variable gain amplifier. A demodulator demodulates an output of the A/D converter into two chrominance signals on two demodulation axes which are apart by 90.degree. from each other. One of the chrominance difference signals is disposed at a right angle with respect to a vector of a burst signal of the carrier chrominance signal and the number of bits of the two chrominance difference signals are chosen such that the number of bits of the one chrominance difference signal disposed at right angles with respect to the burst signal vector is smaller than the number of bits of the other of the two chrominance difference signals. A computing circuit computes an amplitude of the burst signal from the two chrominance difference signals and a gain control circuit produces a circuit for controlling the gain of the variable gain amplifier from the output of the computing circuit. The two chrominance difference signals may be the R-Y and B-Y signal components of a carrier chrominance signal.

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Katano, Japan

Shinich Uchiyama