Television receiver with synchronous detector and common...

Details Television receiver with synchronous detector and common... Television receiver with synchronous detector and common...

H - Electricity

04

N

350/92

H04N 5/44 (2006.01) H04N 5/455 (2006.01) H04N 5/50 (2006.01)

Patent

CA 1131768

ABSTRACT An automatic fine tuning loop in a television receiver is controlled by phase comparison between a video intermediate frequency signal and a reference oscillator signal. The reference oscillator signal is used in synchronous detection of the video intermediate frequency signal. The frequency of the reference oscillator is controlled by a phase locked loop, of which it is a part, and which includes a low-pass filter having selectable high and low cut-off frequencies. A lock-out detector selects the high cut-off frequency for rapid correction when lock-out is detected and selects the low cut-off frequency for frequency stability when lock-in is detected. An AFT disable switch dis- ables the automatic fine tuning loop during manual tuning. In one embodiment, a disable switch ganged with the AFT disable switch selects the high cut-off frequency in the low-pass filter to pre- vent hunting.

327626

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