| 摘要 |
A circuit for generating a composite keying signal includes a burst gate circuit, a clipping circuit, and a volt tage 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.
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