An optical information control device and synchronizing method therefor include a mark detection circuit for detecting marks recorded at even intervals in a track on an optical disk and outputting a mark detection signal indicating a detected mark; a frequency dividing circuit for generating a reference...http://www.google.com.tw/patents/US5577013?utm_source=gb-gplus-share專利 US5577013 - Optical information control device and synchronizing method thereof
