A synchronization holding circuit in scanning of a laser disk comprising a signal detection circuit, a signal processing circuit, an error detection circuit, a speed control circuit, a locking detection circuit, a microcomputer, and a switching circuit, wherein a user can get information on a location...http://www.google.com.au/patents/US5159464?utm_source=gb-gplus-sharePatent US5159464 - Synchronization holding circuit in scanning of laser disk player
