| 摘要 |
A noise reduction circuit for a video signal, comprises a feedback type comb filter in which an output video signal of a delay circuit which delays a video signal by one or two horizontal scanning periods, is fed back to an input side of the delay circuit through a feedback path, and an equalizer circuit coupled in series with the feedback type comb filter. The feedback path comprises a highpass or bandpass filter circuit, a limiter, and a coefficient multiplier which are coupled in series. The equalizer circuit has a frequency characteristic approximately complementary to an envelope characteristic in a frequency characteristic of the feedback type comb filter.
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