RECORD CARRIER IDENTIFICATION USING ASYMMETRY MODULATION

摘要

Record carrier identification information is stored using an asymmetry modulation (figs. 1,2,3). This prevents the access to this information throught the regular data path (65) of the playback device (60). The asymmetry information is automatically removed by the playback device because of the inherent data slicing fig. 4) and decoding that takes place in the play back device.