METHODS AND APPARATUS FOR SYNCHRONOUSLY READING MULTIPLE TRACKS OF AN OPTICAL STORAGE MEDIUM USING MULTIPLE READING BEAMS

摘要

Methods and apparatus are provided for synchronously reading data frommultiple tracks of an optical disk using multiple illumination beams.Circuitry is provided for use with a photodetector array to read and bufferdata in parallel from the multiple adjacent tracks, while asynchronouslyproviding processed data to a host processor. Circuitry is further providedfor correcting phase errors resulting from variations in the linear velocityof the tracks being read, depending upon the radial position of the tracks.