摘要 |
A noise reduction circuit performs noise reduction by an arithmetic operation on an input video signal and its one-frame delayed video signal. At that time, a noise reduction level is always maintained at a constant value that suppresses a trail behind a moving image. An aperture correction circuit performs image-quality correction by using a high frequency component extracted from the video signal as a correction signal. When a detection level of a noise detection circuit exceeds a predetermined value, the level of the correction signal is controlled to decrease. A velocity modulation circuit supplies the high frequency component extracted from the video signal to an auxiliary deflecting coil of a cathode ray tube as a scanning velocity modulation signal so as to perform image-quality correction. When a detection level of the noise detection circuit exceeds a predetermined value, the level of the scanning velocity modulation signal is controlled to decrease.
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