| 摘要 |
Video signal processing circuits which improves an adaptive folding circuit and an adaptive unfolding circuit for lowering and restoring the signal level of a high frequency component in processing a luma signal of a video signal wherein the adaptive folding/unfolding circuits include delays for delaying the luma signal by one pixel respectively formed at both the input terminal and the output terminal of conventional folding/unfolding portions, a level detector for detecting the level of the luma signal, a multiplexer for multiplexing the luma signal in accordance with the detected level value, a high band adjuster having a BPF, an LPF, an inverter and a substracter for decreasing and restoring the high band component while folding the luma signal, a level compensator for compensating the level in accordance with the detected level value, an adder for adding the output signals from the multiplexer, and a mixer for mixing the output signal of the adder with the output signal of the level compensator, so that the high band component level is reduced during folding and restored during reproducing, preventing the deterioration of image quality due to the high frequency component which is folded into the low frequency component.
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