Multichannel record disc reproducing system
AssigneeVictor Company of Japan, Ltd.
InventorsNobuaki Takahashi, Fujio Suzuki, Katsuhiro Ohba
Life of this patent
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Abstract
A multichannel record disc reproducing system comprises at least two phase-locked loops. Each loop includes a phase comparator and a voltage-controlled oscillator for respectively demodulating an angle-modulated signal which is separated from a signal picked up from a multichannel record disc. The picked up signal includes a direct-wave signal and an angle-modulated signal which were multiplexed and recorded. An addition circuit adds the demodulated output signals of the phase-locked loops. The respective phase-locked loops have different lock ranges in order to exclude noise and other distortion.
Claims7
A multichannel record disc reproducing system comprising:
- a first phase-locked loop including a phase comparator and a voltage controlled oscillator for demodulating an angle-modulated signal separated from a signal picked up from a multichannel record disc on which a direct wave signal and an angle-modulated signal are recorded in a multiplexed state, said first phase-locked loop having a lock range of a first width;
- a second phase-locked loop including a phase comparator and a voltage-controlled oscillator for demodulating said angle-modulated signal separated from the picked up signal, said second phase-locked loop having a lock range of a second width which is less than the width of said first lock range;
- and
- addition means for adding the demodulated output signal of said first phase-locked loop and the demodulated output signal of said second phase-locked loop.
Dependencies are inferred from the claim text.