Signal seeking tuning system with illegal channel detection mean

Details Signal seeking tuning system with illegal channel detection mean Signal seeking tuning system with illegal channel detection mean

1974-07-29

1976-09-14

Griffin, Robert L.

325459, H04B 132

Patent

active

039809587

ABSTRACT:
A signal recognizing television tuning system employing a varactor tuner controlled by a ramp voltage source. A counter sequentially supplies channel number information for changing the ramp voltage until the tuner is tuned to receive only signals falling within a restricted frequency range corresponding to the selected channel number. Signal recognition means stop further advance of the counter upon recognition of a television signal. If no television signal is recognized, the counter is advanced and generates a next sequential channel number. An illegal channel number detector causes the counter to automatically advance to the next channel number whenever a non FCC allocated channel number appears.

REFERENCES:
patent: 3555446 (1971-01-01), Bramer
patent: 3818353 (1974-06-01), Sakamoto

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