| 摘要 |
Detection of a standard screen signal or a wide screen signal is performed by a discriminating circuit 10,24 in accordance with the presence or absence of upper and lower black stripes of a wide screen video signal. A video signal transmitted through a low pass filter 23 is supplied to the discriminating circuit 24, the presence or absence of the upper and lower black stripes of the video signal is detected and the discrimination about the standard screen or the wide screen is performed by the discriminating circuit. The noise level of the video signal is detected by an S/N ratio detecting circuit 22, and characteristics of the low pass filter are set in accordance with the output of the S/N ratio discriminating circuit. In this manner the effect of noise on wide screen signal detection is reduced.
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