Control of automatic color control and color killer circuits in

Details Control of automatic color control and color killer circuits in Control of automatic color control and color killer circuits in

1975-10-17

1977-08-09

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 26, 358127, 360 28, 358 27, H04N 576, H04N 949

Patent

active

040415260

ABSTRACT:
In apparatus for reproducing a signal recorded on a magnetic tape or other record medium and which includes a signal band containing an information signal, such as the chrominance component of a color video signal, and a reference signal of a predetermined frequency occurring only during spaced intervals, such as, the burst signal; the mentioned band of the reproduced signal is applied to a variable gain amplifier for controlling the level of the chrominance component, a burst gate receives the level-controlled output of the amplifier and is gated during the intervals of the burst signal to provide an output during each such interval, a crystal filter tuned to the frequency of the burst signal receives the output of the burst gate so as to pass only the burst signal, and the gain of the variable gain amplifier is controlled in accordance with the combined levels of the outputs of the burst gate and the crystal filter, respectively. In providing the gain control signal for the variable gain amplifier, the outputs of the burst gate and crystal filter may be both level detected and the resulting D.C. voltages then added to provide the gain control signal, or only one of such outputs may be level detected and added to the other output to provide an added signal which is then level detected to provide the gain control signal. The combined levels of the outputs of the burst gate and the crystal filter are also preferably employed to control a color killer circuit in the reproducing apparatus.

REFERENCES:
patent: 2982812 (1961-05-01), Rhodes et al.
patent: 3571496 (1971-03-01), Slavik
patent: 3732358 (1973-05-01), Harwood
patent: 3757034 (1973-09-01), Fujita
patent: 3860954 (1975-01-01), Tsuchiya
patent: 3975759 (1976-08-01), Taniguchi et al.

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