Wide band aft circuit for television receivers

Details Wide band aft circuit for television receivers Wide band aft circuit for television receivers

H - Electricity

04

N

350/86

H04N 5/04 (2006.01) H03J 7/06 (2006.01) H04N 5/44 (2006.01) H04N 5/50 (2006.01)

Patent

CA 1050159

ABSTRACT OF THE DISCLOSURE A wide-band automatic fine tuning (AFT) circuit capable of a ?2 MHz pull-in range without false lockups responds to the output of a picture carrier discriminator, a sound carrier discriminator and a vertical synchronizing signal sensing means to operate a reversible digital counter in either its count up or count down direction depending upon the relationship of the outputs of the two discrimina- tors and the synchronizing signal sensing circuit. The output of the counter is supplied to a digital-to-analog converter which produces a tuning control voltage used for controlling the frequency of operation of the local oscil- lator of the receiver. The output of the digital-to-analog converter is added to a conventional AFT voltage which main- tains the desired tuning once it has been established by the wide-band AFT system.

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