| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an optical disk reproducing device correcting a signal equalization characterisitic of an equalizer by using an output of a phase locking loop. SOLUTION: An RF(radio frequency) signal read out from an optical disk is inputted to the equalizer 21. The equalizer 21 equalizes the RF signal by the signal equalization characteristic decided by a voltage of an equalization control signal supplied from a correction part 24. A wide PLL (phase locking loop) 22 receives the signal equalized by the equalizer 21 and a phase locking control signal supplied from an automatic adjustment part 23, and generates a clock signal and the data by using the received signal. The correction part 24 receives the clock signal generated by the wide PLL 22, and supplies the equalization control signal having one out of a beforehand set reference voltage Vref and the voltage obtained from the received clock signal to the equalizer 21. A control part 25 is connected to the automatic adjustment part 23 and the correction part 24 to control this block.</p> |
