发明名称 Video signal recording and reproducing apparatus having a pre-emphasis and de-emphasis system for noise reduction
摘要 A video signal recording and reproducing apparatus comprises a circuit for separating a luminance and carrier chrominance signals from a color video signal and for recording on and reproducing from a recording medium a multiplexed signal in which a frequency modulated luminance signal and a frequency converted carrier chrominance signal which is frequency-converted into a low frequency band are multiplexed, a circuit for obtaining a reproduced luminance signal, a circuit for obtaining a reproduced carrier chrominance signal which is in an original frequency band and has an original phase by subjecting a reproduced frequency converted carrier chrominance signal to a signal processing, a de-emphasis circuit supplied with the reproduced luminance signal and/or an input signal or the reproduced carrier chrominance signal of the processing circuit, for relatively attenuating the level of a high-frequency component in a temporal frequency of the reproduced luminance signal and/or an input signal or the reproduced carrier chrominance signal of the processing circuit compared to a low-frequency component, and a mixer for mixing the reproduced luminance signal and the reproduced carrier chrominance signal so as to produce a reproduced color video signal.
申请公布号 US4658305(A) 申请公布日期 1987.04.14
申请号 US19840634810 申请日期 1984.07.26
申请人 VICTOR COMPANY OF JAPAN, LTD. 发明人 TSUSHIMA, TAKUYA
分类号 G11B20/06;H04N5/923;H04N9/79;H04N9/83;(IPC1-7):H04N9/80;G11B20/24 主分类号 G11B20/06
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