Automatic frequency control method

Details Automatic frequency control method Automatic frequency control method

1997-12-29

2000-01-04

Chin, Stephen

Pulse or digital communications

Receivers

Automatic frequency control

375327, 375376, 4551922, 455260, 455264, H04L 2706

Patent

active

060118180

ABSTRACT:
The present invention relates to a frequency control apparatus for a television and a video cassette tape recorder, and more particularly to an automatic frequency control method wherein a frequency value of a voltage controlled oscillator is increased or decreased and stored by determining whether an oscillator is in a range capable of operating a phase locked loop when an oscillation frequency of the voltage controlled oscillator of the phase locked loop is not synchronized with the intermediate frequency when a frequency is automatically controlled by comparing phases and frequencies of the phase locked loop and the intermediate frequency.

REFERENCES:
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patent: 4151485 (1979-04-01), LaFratta
patent: 4271533 (1981-06-01), Hand et al.
patent: 4712077 (1987-12-01), Ansell et al.
patent: 4903329 (1990-02-01), Marik et al.
patent: 5022058 (1991-06-01), Yoshida et al.
patent: 5287182 (1994-02-01), Haskell et al.
patent: 5335348 (1994-08-01), Kono
patent: 5724105 (1998-03-01), Hatano

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