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公开(公告)号：US5287174A
公开(公告)日：1994-02-15
申请号：US858549
申请日：1992-03-27
申请人： Hiroshi Iizuka , Mituzou Shirai
发明人： Hiroshi Iizuka , Mituzou Shirai
摘要： In a vertical resolution correcting circuit, a noncorrelation component in a vertical direction of a luminance signal included in a video signal is detected. In a region where it is considered that the detected noncorrelation component consists of vertical changes in the luminance signal itself, emphasis, which increases and decreases with a predetermined characteristic, is put on the level of a reproduced luminance signal. However, when the level of the noncorrelation component is higher than a level equal to the amplitude of a synchronizing pulse or an equalizing pulse of the video signal, emphasis is not put on the level of the reproduced luminance signal so as not to cause malfunction.
摘要翻译： 在垂直分辨率校正电路中，检测包括在视频信号中的亮度信号的垂直方向上的非相关分量。 在被认为是检测出的非相关分量由亮度信号本身的垂直变化构成的区域中，在再现的亮度信号的电平上，将以预定特性增减的强调置于该区域。 然而，当非相关分量的电平高于等于视频信号的同步脉冲或均衡脉冲的幅度的电平时，不会将重点放在再现的亮度信号的电平上，以免引起故障。
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2.发明授权
公开(公告)号：US5105275A
公开(公告)日：1992-04-14
申请号：US646099
申请日：1991-01-25
申请人： Hiroshi Iizuka , Mituzou Shirai
发明人： Hiroshi Iizuka , Mituzou Shirai
摘要： A reproduction system noise reduction circuit of a VTR is implemented in combination with a recursive type noise reduction circuit and a non-recursive type noise reduction circuit. The recursive type noise reduction circuit has a characteristic complimentary to that of a recording system vertical emphasis circuit to function as a vertical de-emphasis circuit subjecting a reproduced luminance signal to vertical de-emphasis. The non-recursive type noise reduction circuit cancels noise components without line correlation from the reproduced luminance signal subjected to vertical de-emphasis. It is not necessary to increase noise reduction amount in each noise reduction circuit because vertical de-emphasis and noise reduction are carried out individually. Therefore, degradation of vertical resolution and increase in raining-like noise are prevented.
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