| 摘要 |
PROBLEM TO BE SOLVED: To reduce the side effect of pseudo ghost addition or the like in the convergence process of a filter coefficient by varying the coring level of a differential signal by means of the input processing part of a ghost reducing means in accordance with the noise state of an input/video signal. SOLUTION: A video signal is inputted to a ghost reducing system(GRS) 6 from an RF tuner 1 by way of a video detection circuit 2. The video signal inputted to GRS: 6 is differentiated by a video differentiation circuit 3, coring is executed in a coring part 4, the cored output signal is inputted to a ghost reducing filter (GR filter part) and a coefficient operation is executed for reducing a ghost. Then detection is executed by the voltage detecting circuit 8 of RF.AGC which is connected from the video detection circuit 2 to the RF tuner 1, the coring level (threshold) of the coring part 4 is controlled in a coring level control circuit 7 in the case of exchanging the RF channel and the addition of a ringing component such as the pseudo ghost suppressed.
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