Tuning system for a television receiver

Details Tuning system for a television receiver Tuning system for a television receiver

1981-05-11

1983-06-07

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455182, 455192, H04N 544, H04N 550

Patent

active

043874002

ABSTRACT:
A tuning system is described for use with a television receiver which has channel selection keys on a keyboard for selecting a desired television channel. The system employs a frequency synthesizer for tuning the receiver's local oscillator to a selected television channel. For fine tuning, the system employs a fine tuning key which doubles as a channel selection key. Actuation of this key places the system in a fine tuning mode, and a logic circuit responds to actuation of a channel-up or channel-down key for causing the receiver to be fine tuned in the selected direction. In the preferred embodiment, fine tuning and channel selection are controlled by the logic circuit so as to occur during the receiver's vertical interval to eliminate digital switching noise from the receiver's image.

REFERENCES:
patent: 4038689 (1977-07-01), Rzeszewski
patent: 4234962 (1980-11-01), Hoeft
patent: 4270145 (1981-05-01), Farina
patent: 4280140 (1981-07-01), Skerlos
patent: 4307422 (1981-12-01), Das
patent: 4317226 (1982-02-01), Belisomi

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