Signal level detecting circuit

Details Signal level detecting circuit Signal level detecting circuit

H - Electricity

03

G

328/162

H03G 3/20 (2006.01) H03L 7/087 (2006.01) H04N 9/455 (2006.01) H04N 9/68 (2006.01)

Patent

CA 1101501

ABSTRACT OF THE DISCLOSURE A burst signal level detecting circuit for an automatic color control (ACC) circuit of a television receiver includes a band pass amplifier through which an input chrominance signal is supplied to a first and a second phase comparator via a burst gate A subtracted output of the first and second phase comparators is supplied to a voltage controlled oscillator (VCO) and the output of the VCO is supplied to the first phase comparator and through a phase shifter to the second phase comparator. An added output of the first and second phase com- parators is supplied to the band pass amplifier as an ACC signal for controlling the gain of the band pass amplifier.

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