System for detecting rotational deviation of a rotary recording

System for detecting the operative face of a disc carrying data

System for detection of readout signals from optical disc

System for discriminating optical discs

System for discriminating optical discs

System for duplication of data onto disks

System for encoding a glass master to enable detection of a coun

System for encoding sound recordings for high-density storage an

System for enhanced astigmatic focus signal detection

System for expansion of data storage medium to store user data

System for facilitating the control of audio information within

System for fast reproducing of information recorded on an optica

System for inserting a synchronizing pattern in digital audio da

System for interfacing an optical disk autochanger to a pluralit

System for locking a clock onto the frequency of data...

System for making a photoresist master for a hybrid optical...

System for minimizing the effects of scratches on recording medi

System for multiplexing prioritized virtual channels onto physic

System for noise-free detection of wobbles of optical disk pregr

System for obtaining optimum focusing position in optical disc s