| 摘要 |
In a video signal processing circuit for removing an energy diffusion signal from a broadcasting satellite signal superposed with the energy diffusion signal, a video clamp circuit including a switching circuit for pedestal clamp for the purpose of maintaining a pedestal level as the basis of the black level of a video signal and a noise detection circuit for detecting the noise contained in the video signal, whereby the output from the noise detection circuit is applied to the switching circuit for pedestal clamp so that the clamp performance of the switching circuit for pedestal clamp is reduced by means of the output of the noise detection circuit when an S/N ratio applied to the noise detection circuit is not good, thereby improving the quality of the reception picture.
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