Automatic control circuit to a color television receiver of

摘要

P a. automatic control circuit to a television receiver in color. / p & & p & b. detector characterized in that it comprises a subtracter receiving the output signal of the first phase comparator and that of the second phase comparator to control the oscillator of a variable frequency, as well as an adder receiving the output signal of the first and second phase comparators to give an output signal proportional to the level of the input signal. / p