| 摘要 |
An automatic ghost-suppression system having an adder, a variable delay device, and a polarity and gain control device. The variable delay device is connected with the adder through the polarity and gain control device. A video signal is simultaneously applied to both the adder and the variable delay device, and added in the adder to the video signal which is delayed by the variable delay device and then preferably adjusted in its polarity and amplitude by the polarity and gain control device. On the other hand, a synchronizing signal is separated from the delayed video signal and used for generation of a gate signal for detecting a residual ghost during a vertical blanking period. From the video signal produced at the output of the adder, the residual ghost contained in the vertical blanking period is detected by the gate signal and used as a control signal for controlling the polarity and gain control device thereby to automatically suppress the ghost.
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