Composite keying signal generator for a television receiver

Details Composite keying signal generator for a television receiver Composite keying signal generator for a television receiver

H - Electricity

04

N

350/57

H04N 9/12 (2006.01) H04N 5/06 (2006.01) H04N 9/44 (2006.01)

Patent

CA 1153106

RCA 72,804 Abstract of the Disclosure A circuit for generating a composite keying signal includes a burst gate circuit, a clipping circuit, and a voltage divider, in a color television receiver also including means for deriving horizontal and vertical blanking signals and a horizontal sync pulse from a composite color television signal containing a color burst component. The burst gate circuit responds to the lagging edge of the horizontal sync pulse to develop a burst gate pulse encompassing the burst interval. The clipping circuit and the voltage divider serve to clip and trans- late both the horizontal and vertical blanking signals, which are then combined with the burst gate pulse to produce a composite keying signal. The composite keying signal comprises a first pulse component of desired magnitude as determined by the clipping and voltage divider circuits and occurring during the blanking intervals, and a second pulse component as provided from the burst gate circuit, superimposed on the first pulse and encompassing the burst interval.

367587

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