Search type tuning system with synchronization signal presence t

Details Search type tuning system with synchronization signal presence t Search type tuning system with synchronization signal presence t

1981-05-08

1982-11-02

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 550

Patent

active

043576320

ABSTRACT:
A signal seeking tuning system of a television receiver includes a composite synchronization detector which generates a logic "0" when various parameters of the composite synchronization signal is correct and a logic "1" when they are incorrect as the local oscillator frequency is being decreased. After a transition detector determines when a transition from a "0" to "1" occurs, indicating the location of a picture carrier, the frequency of the local oscillator is stopped from changing.

REFERENCES:
patent: 3936753 (1976-02-01), Clark
patent: 4217552 (1980-08-01), Mogi et al.
patent: 4236182 (1980-11-01), Minoura et al.

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