Frequency synthesizer tuning system for television receivers

Details Frequency synthesizer tuning system for television receivers Frequency synthesizer tuning system for television receivers

1975-11-26

1977-05-24

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

325420, 325464, H04N 544

Patent

active

040259536

ABSTRACT:
A television tuning system employs a frequency synthesizer system for establishing the tuning of the receiver. A programmable frequency divider, controlled by a reversible counter, is connected between the output of a reference oscillator and a phase comparator to which the output of the local oscillator in the tuner also is applied. The phase comparator output provides a tuning voltage for controlling the tuning of the local oscillator. A logic circuit is coupled to sense predetermined relationships of signals from a picture carrier detector, a sound carrier detector, an AFT signal, and the presence of vertical synchronization signal components for changing the count in the reversible binary counter to adjust the programmable frequency divider to compensate for channel frequency offsets which may occur in excess of the pull-in range of the AFT circuit.

REFERENCES:
patent: 3459887 (1969-08-01), Baker
patent: 3737565 (1973-06-01), Ma et al.
patent: 3825838 (1974-07-01), Mayle
patent: 3845393 (1974-10-01), Basset
patent: 3867568 (1975-02-01), Merriweather
patent: 3944925 (1976-03-01), De Laune
patent: 3946329 (1976-03-01), Caspari
patent: 3949158 (1976-04-01), Rzeszewski et al.

Affiliated with

Also associated with

Rating

Frequency synthesizer tuning system for television receivers does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frequency synthesizer tuning system for television receivers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency synthesizer tuning system for television receivers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-541303