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A Discrete Four-Channel Disc and Its Reproducing System (CD-4 System)

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A newly developed discrete four-channel disc recording system with its associated reproducing system is described. It involves a new modulation method in which a modulated carrier cuts the 45/45 stereo groove. The four discrete input channels can then be replayed through an economical reproducer. The compatibility of the system with normal two-channel stereo is discussed.

JAES Volume 19 Issue 7 pp. 576-583; July 1971
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