| 摘要 |
A video signal processor for reproducing a MUSE signal in the form of a Hi-vision signal. In transmitting a Hi-vision television signal, a signal obtained by thinning out the complete group of sampling points which are extracted from the original Hi-vision video signal in accordance with a predetermined rule is transmitted. A video signal processor in a TV set completes sampling points which are thinned out on the transmission side by interpolation. In a conventional video signal processor, since it is necessary to process a signal at a digital portion at a high speed, the circuit must be composed of elements which operate at a high speed. It is also necessary to use a low-pass filter having a sharp cutoff characteristic in the process of cutting off the high-frequency component of the output signal. In the present invention, an input signal is first subjected to time base expansion and the horizontal frequency characteristic is adjusted by the high-pass filter and the band-rejection filter, thereby enabling signal processing at a comparatively low speed. Thus, a predetermined horizontal frequency characteristic is realized by a cheap low-pass filter. A color signal interpolated between fields is produced from the data interpolated between frames by passing the data interpolated between fields through a low-pass filter and a bandpass filter, and adding the respective outputs, thereby removing the vertical line disturbance due to the variation in the clamping level between fields which is a problem remaining unsolved in the related art.
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