Video synchronous detector apparatus

Details Video synchronous detector apparatus Video synchronous detector apparatus

1977-12-20

1980-02-12

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

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H04N 950

Patent

active

041886399

ABSTRACT:
A video synchronous detector apparatus for discriminating a video intermediate frequency signal, in which the video intermediate frequency signal is divided into two parts, one of which is applied to one terminal of a multiplier circuit, and the other of which is applied to the other terminal of the multiplier circuit through a picture-carrier intermediate frequency extraction circuit having a frequency selection circuit and a limiter circuit. The frequency selection circuit is provided with a trap circuit. The trap circuit has a center resonance frequency equal to a differential frequency between a picture-carrier intermediate frequency (f.sub.p) and a differential frequency between a color subcarrier intermediate frequency (f.sub.c) and a sound-carrier intermediate frequency (f.sub.s) so that a so-called sound-cross-color disturbance caused by a beat between the intermediate frequency sound signal and the intermediate frequency picture signal may be reduced.

REFERENCES:
patent: 3613032 (1971-10-01), Pond
patent: 3697685 (1972-10-01), Lunn
Lunn, "A Monolithic Wideband Synchronous Video Detector for Color TV", IEEE Trans. BTR, Jul. 1969, vol. BTR-15 #2, pp. 159-166.

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