Phase locked loop television tuning system

Details Phase locked loop television tuning system Phase locked loop television tuning system

1977-03-18

1978-08-08

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 544

Patent

active

041060598

ABSTRACT:
A phase locked loop tuning system for a television receiver includes a voltage controlled local oscillator for generating a local oscillator signal corresponding to the channel presently selected by a viewer, a source of a reference frequency signal, a phase detector for generating pulses at the reference frequency the duration of which is a function of the phase and frequency relationship between the reference frequency signal and the local oscillator signal, and a low pass filter for deriving a D.C. control voltage for the voltage controlled oscillator from the output signal of the phase detector. The reference frequency is related to the horizontal and vertical television scanning rates in a predetermined manner so that undesired image components generated in response to unfiltered pulse components of the control voltage occurring at the reference frequency are substantially cancelled as an image is formed.

REFERENCES:
patent: 4009439 (1977-02-01), Rast
patent: 4024476 (1977-05-01), Briggs
patent: 4025953 (1977-05-01), Sideris
patent: 4031549 (1977-06-01), Rast et al.

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