Television signal determination in an automatic tuning system

Details Television signal determination in an automatic tuning system Television signal determination in an automatic tuning system

1978-04-26

1980-05-27

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3581921, 3581931, H04N 544

Patent

active

042053471

ABSTRACT:
A television signal determination circuit is associated with an automatic tuning system, which automatically tunes a television set to local channels, in order to determine whether received signals are desired television signals. The television signal determination circuit comprises a first counter means for counting received synchronizing signals for a predetermined period of time, a second counter means for counting reference clock signals for the predetermined period of time, and a determination means for determining whether the synchronizing signals are received by a predetermined number within the predetermined period of time by comparing output signals from the first and second counter means.

REFERENCES:
patent: 3610817 (1971-10-01), Bridgewater
patent: 3632864 (1972-01-01), Evans
patent: 3949164 (1976-04-01), Murakami

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