Detecting and correcting method for optical disc reading clock pulse and its circuit

The present invention discloses the detecting and correcting method and circuit of optical disc reading clock pulse. The detecting and correcting method includes first inputting data signal and clock pulse signal; then detecting the data signal based on the clock pulse signal and generating sync mark signal; generating the sync window signal, which is behind the last sync mark signal by the first preset time and has the second preset width; and finally comparing the sync mark signal with the sync window signal to correct the clock pulse signal based on the lagging amount of the sync mark signal behind the sync window signal. 本发明揭露一种光盘读取时钟脉冲的检测修正方法及其电路。此检测修正方法是先输入数据信号以及时钟脉冲信号，然后依时钟脉冲信号检测数据信号，并产生同步标记信号。在前一次同步标记信号发生处依时钟脉冲信号的时序计数至第一预定时间，产生同步窗信号，此同步窗信号具有第二预定时间的宽度。然后比较同步标记信号的时序落于同步窗信号的位置，并依比较结果修正时钟脉冲信号。