| 摘要 |
A noise reduction circuit comprises a lowpass filter supplied with a luminance signal having a noise component of an input video signal, for eliminating a high-frequency component including the noise component, a first circuit for subtracting an output signal of the lowpass filter from the luminance signal, in a state where a rise in the level of the luminance signal is delayed by a predetermined time tau from the start of a rise in the output of the lowpass filter, where the output signal of the lowpass filter has a rise time tau , and a second circuit for amplitude-limiting a subtracted output of the first circuit and subtracting the amplitude-limited output from the luminance signal, to obtain a luminance signal eliminated of the noise.
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