OPTICAL DISK SIGNAL-REPRODUCING DEVICE

摘要

PROBLEM TO BE SOLVED: To accurately and optimally set an optimum amount of delay by equipping a rough delay means for roughly adjusting the delay of a specific reproduction signal and an accurate delay means for finely adjusting the delay of the specific reproduction signal with accuracy that is equal to or less than the minimum delay resolution of the rough delay means. SOLUTION: A variable delay element 12b that is an accurate delay means in a digital control system for rough adjustment delays a signal S2 that is generated by a laser beam L2 by τ2 as a signal S2a. An A/D converter 14b converts a signal S2a to a digital signal and transmits it to registers 25a-25d in a shift register 25 that is a rough delay means in an analog control system for fine successive adjustment in synchronization with a clock CLK. The registers 25a-25d output a digital delay signal that is obtained by delaying the signal S2a by a delay nT at a clock cycle of T. By selecting an optimum signal from the digital delay signals by a tap switching means 27, a required amount of delay τ2+nT can be accurately obtained.