Circuitry for line recognition of a television signal

Details Circuitry for line recognition of a television signal Circuitry for line recognition of a television signal

1978-05-16

1979-10-02

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358139, 358147, 358 10, 358 21R, H04N 702, H04N 548, H04N 962, H04N 9535

Patent

active

041700260

ABSTRACT:
Circuitry for line recognition of a television signal comprises a serration detector which receives the sync pulse and separates the portion of the serration of the vertical sync pulse; a first counter which is coupled to the serration detector and produces output pulse at specific time interval between two successive output pulses of the serration detector; a circuit which is triggered by the output pulse of the first counter and produces a pulse; a second counter which receives said pulse and the horizontal retrace pulse, counts said horizontal retrace pulse when said pulse has a specific level, becomes quiescent when said pulse has another specific level, and then produces the line identification pulse on the desired horizontal line; a first decoder which is connected to said second counter and produces the reset pulse for resetting said first counter after said first counter completes its desired counting action; and a second decorder which produces the reset pulse for resetting said circuit after said second counter produces desired line identification pulse.

REFERENCES:
patent: 3867010 (1975-02-01), Rzeszewski
patent: 3989891 (1976-11-01), Freestone
"GE's `Broadcast-Controlled` Color System", Parts 1 and 2, Electronic Technician/Dealer, Aug. 1976, pp. 14-21, Sep. 1976, pp. 20-29.

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