Disc drive control system

摘要

A disc drive control system for controlling the drive of a disc carrying a binary digital signal including clock information of a predetermined frequency wherein the digital signal includes an information signal portion to be recorded and an synchronizing signal portion which includes successive maximum periods of inversion (transitions). The system includes a detection means for detecting the period of the transition of the synchronizing signal and producing a detection signal, (frame sync servo signal) disc a control means for producing a disc drive control signal for controlling a disc drive means. The drive control signal is produced in accordance with the detection signal prior to a period in which the drive control signal is produced in accordance with a reproduced clock signal (playback clock and playback frame sync signals), whereby eliminating the problem that the driving speed of the disc may be controlled in accordance with an erroneously reproduced clock signal.