Method for detecting vertical synchronizing signal

Details Method for detecting vertical synchronizing signal Method for detecting vertical synchronizing signal

1981-05-20

1982-11-02

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 510

Patent

active

043576303

ABSTRACT:
A vertical synchronizing signal detecting method is disclosed which comprises the steps of detecting a unit signal from a complex synchronizing signal including a vertical synchronizing signal formed of a predetermined number of continuous unit signals each having a predetermined waveform, counting a number of the unit signals, and producing a detecting signal having a predetermined timing relation to the vertical synchronizing signal when it is detected that the unit signals continuously arrive with the above predetermined number.

REFERENCES:
patent: 4240111 (1980-12-01), Meise

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