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1.发明授权Demodulation system for angle-modulated wave picked up from a multi-channel record disc 失效从多通道记录盘拾取角度调制波的解调系统
公开(公告)号：US3911232A
公开(公告)日：1975-10-07
申请号：US42911473
申请日：1973-12-28
Applicant: VICTOR COMPANY OF JAPAN
Inventor： ITOH YASUO
CPC classification number: H04H20/89 , G11B20/00992 , H03G3/34 , H04S3/006
Abstract: A demodulation system comprises a phase-locked loop for demodulating an angle-modulated wave picked up from a multichannel record disc. A circuit reduces the loop gain of the phase-locked loop to reduce the lock range width of the loop. The lock range falls within the bandwidth of the angle-modulated wave and prevents the occurrence of erroneous locking responsive to the harmonic components of a direct wave. An amplification circuit compensates for a frequency characteristic on the high frequency side of a signal demodulated by the phase-locked loop.
Abstract translation: 解调系统包括用于解调从多通道记录盘拾取的角度调制波的锁相环。 一个电路可以减少锁相环的环路增益，以减小环路的锁定范围宽度。 锁定范围落在角度调制波的带宽内，并且防止响应于直接波的谐波分量的错误锁定的发生。 放大电路补偿由锁相环解调的信号的高频侧的频率特性。
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公开(公告)号：US3896272A
公开(公告)日：1975-07-22
申请号：US40316573
申请日：1973-10-03
Applicant: VICTOR COMPANY OF JAPAN
Inventor： TAKAHASHI NOBUKAI , IWASAKI YOSHIKI , KASUGA MASAO , ITOH YASUO
CPC classification number: H03G3/34
Abstract: A muting system in a multichannel record disc reproducing apparatus comprises a phase locked loop circuit having a phase comparator and a voltage controlled oscillator. A synchronous detector is supplied with an angular modulated wave which is reproduced from the disc and with an output signal of the voltage controlled oscillator. The detector produces a specific output signal when the phase locked loop circuit is locked to the input angular modulated wave and is carrying out normal demodulation operation. Muting is introduced to the output demodulated signal of the phase locked loop in response to the output of the synchronous detector means. The muting circuit permits passage of a demodulated signal only when the phase locked loop circuit is in a locked state.
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