Color television control circuit for use with a VIR signal

Details Color television control circuit for use with a VIR signal Color television control circuit for use with a VIR signal

1976-12-23

1978-12-19

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 28, H04N 9535

Patent

active

041308310

ABSTRACT:
Color television receiving apparatus for receiving and demodulating a composite color television signal including hrozintal synchronizing signals, color burst signals, and luminance and chrominance components. This composite color television signal is of the type which additionally may or may not include a VIR signal which, typically, is broadcasted in a predetermined line interval during the vertical retrace period of the composite color video signal. The apparatus includes the demodulator for demodulating the chrominance component, which has been separated from the composite video signal, into its color signal components. A signal generator generates a signal, such as a gate signal, during the predetermined line interval in which the VIR signal is expected. Control circuitry is energized by this generated signal to respond to selected components produced by the demodulator during the line interval in which the VIR signal is provided for producing signals which are used to control the color signal components demodulated by the demodulator, such as to control the hue and saturation of such demodulated components. Manually operable adjusting circuitry is coupled to the control circuitry for selectively varying the control signals in accordance with an operator's particular preference for hue and/or saturation characteristics of the reproduced color video picture. In one embodiment, switching circuitry is provided to selectively energize the control circuitry either with the aforementioned generated gate signal or, in the event that the transmitted video signal is not provided with a VIR signal, with an alternative periodic gating signal, such as a signal derived from the horizontal sync signal.

REFERENCES:
patent: 3368030 (1968-02-01), Wiencek
patent: 3673320 (1972-06-01), Carnt
patent: 3679816 (1972-07-01), Avins
patent: 3780218 (1973-12-01), Rennick
patent: 3950780 (1976-04-01), Freestone
Ge's "Broadcast-Controlled" Color System-Part 2, Electronic Technican/Dealer, Sep. 1976, pp. 20-29.

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