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Experiments Toward an Erasable Compact Disc Digital Audio System

Recording experiments of erasable information in magneto-optical amorphous layers on pregrooved disks are described. The recording and reading of information is done on a recorder provided with an AIGaAs laser and equipped for polarization-sensitive readout of the Kerr effect. The signal-to-noise ratio and the bit error rate of the recorded information have proven to be sufficient for half an hour of digital music according to the Compact Disc digital audio standard on a 120-mm-diameter disk (equivalent to 400 00 bit/mm(2). With only slight modification the recorder can be used to read out normal Compact Disc records.

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JAES Volume 32 Issue 7/8 pp. 531-538; August 1984
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AES - Audio Engineering Society