Wide band aft circuit for television receiver

Details Wide band aft circuit for television receiver Wide band aft circuit for television receiver

1974-12-31

1976-04-06

Mayer, Albert J.

Telegraphy

Systems

Simplex-reversing periodic

325423, H04N 560

Patent

active

039491587

ABSTRACT:
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 discriminators 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 oscillator of the receiver. The output of the digital-to-analog converter is added to a conventional AFT voltage which maintains the desired tuning once it has been established by the wide-band AFT system.

REFERENCES:
patent: 3715495 (1973-02-01), Takezaki
patent: 3737565 (1973-06-01), Ma
patent: 3845393 (1974-10-01), Basset

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