SPINDLE SERVO EQUIPMENT IN INFORMATION RECODING DISK REPRODUCING DEVICE

PURPOSE:To attain low cost by detecting a phase difference between a synchronizing signal included in a reproduced digital signal and reference signal at the time of pulling in a servo and applying the drive control of a spindle motor based on the phase difference so as to eliminate a frequency generator and its relevant circuit. CONSTITUTION:The frequency of a reference clock generated from a reference clock generator 43 in a digital information demodulation system is constant and the spindle servo is applied based on the phase difference between a frequency division signal of a fixed reference clock and a frequency division signal of a frame synchronizing signal. That is, in case of the reproduction, the phase difference between the synchronizing signal included in the reproduced digital signal and the reference signal is detected to pull in the spindle servo based on the phase difference. Since the frequency generator and its relevant circuit are omitted, the low cost is attained.