| 摘要 |
<p>PURPOSE:To obtain a video signal whose high-pass area is improved by selecting the output signal of a delay circuit at a first switching circuit for each constant horizontal period when a line signal of same pattern is supplied successively. CONSTITUTION:When the line signal of a pattern B is formed by continuing, for example, (n-1) lines and (n) lines a the video signal Sin supplied to an input terminal 1, the line signals of same pattern are continued, therefore, a change-over switch 10 is connected to (b) side in the horizontal period when the signals of (n-1) lines are supplied to the input terminal 1. Therefore, the signals of (n-2) lines are outputted successively in the horizontal period when the signals of (n-1) lines and that of (n) lines are supplied to the input terminal 1. Therefore, the sampling timing of high-pass components outputted from first and second high-pass filters 2, 8 are always set alternately, and the high-pass component included in an output video signal goes to the one sampled by a sampling cycle of 1/2 essentially. In such a way, the output video signal whose high-pass area can be improved can be obtained.</p> |
