| 摘要 |
<p>PURPOSE:To obtain a desired characteristic and to efficiently suppress occurrence of folded distortion and moire or the like by using a 1-line delay line so as to form a cyclic feedback form. CONSTITUTION:An adder 11 adds an input signal (television video signal) and a feedback signal to output a video signal and a 1-line delay line 12 delays the added video signal by one line from which the video signal subjected to delay is outputted. A cyclic feedback circuit 13 is provided with a difference circuit 14 obtaining a difference between the input signal and the delayed video signal, a level detector 15 detecting the level of the video signal difference to output a detected level signal, and a feedback signal output circuit 16 outputting the feedback signal in response to the detected level signal and generates the feedback signal from the input signal and the delayed video signal. Then the cyclic vertical filter outputs the added video signal as an output signal.</p> |
