A digital audio disc system has been developed, suitable for professional background music equipment. It utilizes Continuously Variable Slope Delta Modulation (CVSDM), one of the Adaptive Delta Modulation (ADM) schemes. The system employs the same recording format (error correction and modulation) as that of the Compact Disc (CD) which permits use of disc mastering facilities and signal processing circuitry developed for the CD system.: Eight audio channels can be recorded on one disc, which corresponds to one hour per channel, totaling eight hours of recording time with an audio bandwidth of 15 kHz.
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