| 摘要 |
<p>A processing circuit for a video signal wherein an input video signal is fed to an input terminal (10) and then introduced to one of the input terminals of a subtracter (11) and a high-pass filter (12). High frequency components outputted from the high-pass filter (12) are adjusted in level by a first variable gain amplifier (13) whose gain can be adjusted externally, and then inputted to a limiter (15). The limiter (15) outputs components having levels less than the limiting level as noise components too, and the noise components outputted by the limiter (15) are adjusted in level by a variable gain amplifier (16) whose gain can be adjusted externally to be fed to the other input terminal of the subtracter (11). By the gain control of the first variable gain amplifier (13), the limiting level of the limiter is fitted for the levels of the inputted noise components. By the gain control of the second variable gain amplifier (16), the level of the components for noise cancel fed to the latter input terminal of the subtracter (11) is fitted for the noise component to be cancelled.</p> |
