On-the-fly of jitter during optical disc mastering/recording

摘要

A system for the on-the-fly control of jitter during optical disc mastering/recording includes a record disc (24) having a recording surface (26) thereon of the type in which a pit can be read directly after it is written. A write-laser (32) directs its write-beam (34) though an acousto-optic modulator (36) onto the recording surface (26) of the rotating record disc (24). A digital processor (42) accepts digital input values and outputs a signal to the acousto-optic modulator (36) that effectively gates the write-beam (34) on and off. A read-laser (46) is positioned downtrack from the write-laser (32) and reads the pits (16) immediately or shortly after being written by the write-laser (32). The output of the read-laser (46) is fed into a jitter detector (48) that senses the start and stop positions of a sequence of pits (16) and effects an analysis to arrive at a jitter value. A jitter compensator (50) provides a processed correction value to the digital processor (42) which then controls the write-laser (32) to reduce the measured jitter value.