Electronic system for automatically tuning to a selected televis

Details Electronic system for automatically tuning to a selected televis Electronic system for automatically tuning to a selected televis

1974-06-05

1977-04-26

Griffin, Robert L.

Oscillators

Relaxation oscillators

325470, 331 19, H03B 308

Patent

active

040204197

ABSTRACT:
An all electronic tuning system is described for establishing a frequency of a local oscillator in a television receiver. When a channel selection is made, a number representing the desired channel is entered in a memory circuit. A first plurality of frequencies is generated in response to a channel selection, and a VCO employed as a local oscillator is caused to increase in frequency. When the VCO frequency differs from the first plurality of frequencies by a predetermined amount, a second plurality of frequencies is generated. Each frequency generated in said second plurality of frequencies is compared with said VCO frequency. When a predetermined difference exists between said VCO frequency and said second plurality of frequencies, a count is recorded. When the recorded count is equivalent to the number obtained in the memory circuit, the VCO tuning is inhibited and the VCO frequency is stabilized until a subsequent channel selection is made.

REFERENCES:
patent: 3221266 (1965-11-01), Vitkovits
patent: 3259851 (1966-07-01), Braver
patent: 3641434 (1972-02-01), Yates
patent: 3818353 (1974-06-01), Saramoto
patent: 3846707 (1974-11-01), Sakamoto
patent: 3857107 (1974-12-01), Lieberman et al.
patent: 3864636 (1975-02-01), Fukuda et al.
patent: 3924192 (1975-12-01), George

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