Picture quality adjusting circuit with fir filter for digital processing.

摘要

A digital filter (22) receives the digital video signal and extracts a high-frequency component therefrom. A first waveform-shaping element (24) wave-shapes the high-frequency component to provide a noise cancel signal for canceling the noise. A second waveform-shaping element (26) wave-shapes the high-frequency component to provide a contour compensation signal for compensating a contour of a picture. An adder (28) adds the digital video signal, the noise cancel signal and the contour compensation signal to provide a signal with adjusted picture quality.