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1. 发明授权

US5555096A Frequency folding and unfolding circuits of a video signal recording/reproducing apparatus 失效
标题翻译：视频信号记录/再现装置的频率折叠和解折叠电路
公开(公告)号：US5555096A
公开(公告)日：1996-09-10
申请号：US326749
申请日：1994-10-20
申请人： Jae-chun Yoo
发明人： Jae-chun Yoo
IPC分类号： H04N5/92 , G11B20/00 , H04N9/797 , H04N9/83 , H04N9/85 , H04N9/79
CPC分类号： H04N9/7976
摘要： Folding and unfolding circuits of a video signal in a video recording/reproducing apparatus for recording a video signal of a full bandwidth including a chroma signal and a luma signal on a recording medium having an effective limited bandwidth and reproducing the recorded luma signal and chroma signal into the video signal of a full bandwidth, use a frequency folding technique by means of sub-Nyquist sampling. A region of a high-frequency signal is folded onto a region of a limited low-frequency luma signal. A remaining high-frequency luma signal is folded on the remaining region of the limited low-frequency luma signal, to thereby record the luma signals according to a field period. The full-bandwidth video signal is then reproduced by band-compensation during reproducing. Thus, crosstalk between channels is decreased to thereby obtain a clear picture of high resolution.
摘要翻译：视频记录/再现装置中的视频信号的折叠和展开电路，用于在具有有效有限带宽的记录介质上记录包括色度信号和亮度信号的全带宽的视频信号，并再现记录的亮度信号和色度信号进入全带宽的视频信号，通过次奈奎斯特采样采用频率折叠技术。高频信号的区域被折叠到有限的低频亮度信号的区域上。剩余的高频亮度信号被折叠在受限的低频亮度信号的剩余区域上，从而根据场周期记录亮度信号。然后在再现期间通过频带补偿再现全带宽视频信号。因此，通道之间的串扰减小，从而获得高分辨率的清晰图像。

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