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    • 10. 发明授权
    • Luminance signal/color signal separating circuit and noise reduction
circuit using a comb filter
    • 亮度信号/彩色信号分离电路和使用梳状滤波器的降噪电路
    • US5060056A
    • 1991-10-22
    • US521489
    • 1990-05-10
    • Shigeru MikiMitsuzou ShiraiYuuichi Ichikawa
    • Shigeru MikiMitsuzou ShiraiYuuichi Ichikawa
    • H04N9/78H03H15/00H04N9/79H04N9/83H04N9/84H04N9/88
    • H04N9/7908H04N9/83H04N9/88
    • A luminance signal/color signal separating circuit comprises a comb filter for Y/C separation. The addition output of the comb filter comprises a luminance signal component, while the subtraction output comprises a color signal component and non-correlation components of a luminance signal. The non-correlation components in the subtraction output are extracted by a trap circuit and added to the addition output of the comb filter. Accordingly, the degradation of vertical direction resolution of reproduced signal will be prevented. Also, under some circumstances, the extracted non-correlation components are previously enhanced before being added to the luminance signal. The noise reduction circuit in reproduction mode shares the above comb filter for color signal separation. When dropout occurs, the color signal in the output of the 1H delay circuit of the comb filter is inverted and separated to be used as a drop out compensation signal.
    • 亮度信号/颜色信号分离电路包括用于Y / C分离的梳状滤波器。 梳状滤波器的相加输出包括亮度信号分量,而减法输出包括亮度信号的颜色信号分量和非相关分量。 减法输出中的非相关分量由陷波电路提取,并与梳状滤波器的相加输出相加。 因此,可以防止再现信号的垂直方向分辨率的劣化。 此外,在某些情况下,提取的非相关分量在被添加到亮度信号之前被预先增强。 再现模式中的降噪电路与上述梳状滤波器共享用于颜色信号分离。 当发生压差时,梳状滤波器的1H延迟电路的输出中的颜色信号被反转和分离以用作丢弃补偿信号。