Phase detection circuit and automatic tint control circuit...

Details Phase detection circuit and automatic tint control circuit... Phase detection circuit and automatic tint control circuit...

H - Electricity

04

N

350/59

H04N 9/12 (2006.01) H04N 9/64 (2006.01)

Patent

CA 1153462

- 1 - Abstract: The present invention relates to a phase detection circuit. The phase detection circuit includes a first phase detector for receiving an input signal and a first reference signal, a second phase detector for receiving the input signal and a second reference signal having a different phase from that of the first reference signal and a level discriminator for receiving the phase detection output of the first phase detector. The detection operation of the second phase detector can be inhibited directly by means of the output of the level discriminator. Accordingly, a phase detected output is obtained only when the phase difference between the input signal and the first reference signal falls within a predetermined range. The phase detection circuit having such a limiting function is suitable for application to an automatic tint control circuit of a color television receiver.

367799

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