| 摘要 |
<p>In a noise reducing circuit for a video signal comprising a first subtractor (2), a delay line (3), a second subtractor (4), a non-linear circuit (7) having a full-wave rectification circuit (7b) and a gain control circuit (7a), the gain control circuit (7a) controls a gain such that an output signal level derived from the non-linear circuit (7) increases in accordance with the increase in an output signal from the full-wave rectification circuit (7b) when the output signal level of the second subtractor (4) is within a determined extent, and that the output signal level derived from the non-linear circuit (7) decreases in accordance with the increase in the output signal from the full-wave rectification circuit (7b) when the output signal level of the second subtractor (4) is out of the determined extent.</p> |
