Channel selection system for television receiver

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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Details

H04N 544

Patent

active

042401143

ABSTRACT:
When a receiving channel of television broadcast is selected by the frequency sweep, a video carrier and an audio carrier appear alternately at an output of an intermediate frequency (IF) stage. A channel selection system is disclosed, which distinguishes the video carrier and the audio carrier from each other by the presence or absence of a sync. separation pulse during the frequency sweep, in which a sync. pulse is distinguished from a noise pulse by the presence or absence of a horizontal flyback pulse and the video carrier is distinguished from the audio carrier in response to the presence or absence of the sync. pulse to selectively stop the sweep.

REFERENCES:
patent: 3388215 (1968-06-01), Mayle
patent: 3610817 (1971-10-01), Bridgewater
patent: 3825838 (1974-07-01), Mayle

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