| 摘要 |
PURPOSE:To make a program search for music speedily and accurately by utilizing a tracking servocontrol signal which performs on-off control over a tracking servo circuit to putting a synchronizing circuit in resynchronizing operation in tracking servo-off mode. CONSTITUTION:The tracking sevocontrol signal 30 (turning a servo on with a logical value ''1'' and off with ''0'') controls an RS.FF 26 to decides on a step- out once when the tracking servo is turned off and starts restarts resynchronization immediately. Consequently, the set input of the RS.FF 26 is as shown by 31a and the resynchronization is started simultaneously with the movement of an optical pickup 3, so the 1st synchronizing signal B after the movement is detected. Consequently, more reproduction outputs are obtained correspondingly to the fastness of the resynchronization in cue and review reproduction and more pieces of address information necessary for a program search for music that the data part of a reproduced digital signal 29 contains are obtained, so the speedy program search for music is made. |
