| 摘要 |
<p>PURPOSE:To reduce the deterioration in a picture quality at the processing of a video signal by selecting a waveform of a YS guard signal interposed between a color difference signal and a luminance signal to be a waveform nearly equal to that of a reference YC guard signal. CONSTITUTION:A YC guard signal SY1 generated by a prescribed ROM circuit is interposed between a color difference signal C and a luminance signal Y at a time division multiplex circuit 32. The signal SY1 is formed in such a way that its level is sequentially decreased from the vicinity of an achromatic level to the vicinity of a black level, and its waveform is selected nearly equal to a waveform of a reference YC guard signal when the signal is processed by a horizontal NLE circuit 12. Thus, even when the inserted signal is replaced with the reference guard signal and the result is subjected to de-emphasis processing, waveform distortion after demodulation is reduced to reduce the deterioration in the picture quality.</p> |
