发明名称 RECORDING AND REPRODUCING DEVICE FOR CHROMINANCE CARRIER SIGNAL
摘要 PURPOSE:To obtain a recording and reproducing circuit for a chrominance carrier signal without distortion of hue and amplitude by making the operation of a pre-emphasis circuit and a de-emphasis circuit different from the vertical scanning period and the vertical blanking period. CONSTITUTION:An output chrominance signal of a subtraction circuit 21 is fed a 1H delay circuit 23 and then coefficient circuits 26, 33 having different weighting. Then the chrominance carrier signal subject to 1H delay is fed to either of coefficient circuits 24, 31 having different weight via a switch circuit 30, and fed back to the subtraction circuit 21 via a hue adjustment device 25. On the other hand, a pulse in 30Hz being at an H level only during the blanking period from a pulse generator 35 is outputted and this pulse attains switching of the switches 30, 32. Thus, the coefficient circuits 24, 26 apply weighting during the vertical period and the coefficient circuits 31, 33 apply weighting during the vertical blanking period, then the operation of the pre-emphasis circuit is made different depending on both the periods.
申请公布号 JPS613594(A) 申请公布日期 1986.01.09
申请号 JP19840124809 申请日期 1984.06.18
申请人 NIPPON VICTOR KK 发明人 SHIBAYAMA TAKECHIKA
分类号 G11B20/02;G11B5/027;H04N5/923;H04N9/79;H04N9/80;H04N9/83 主分类号 G11B20/02
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