Concentric photodetector arrangement for focusing and tracking
Constant linear velocity recording servo circuit for write-once
Control apparatus for a recording medium drive motor in a digita
Control circuit for optical record medium processing device...
Control circuitry for preliminary focusing of light on a record
Control information detecting method and apparatus in optical-ty
Control system for a compact disk player
Control system for an optical data recording apparatus
Controls for optical disk relating to accessing and utilization
Copy protection system and method for optical disks and a...
Correcting recorded marks and land lengths taken from an optical
Cross interleaving circuit