Patent ID: 7224659

Claim:
A disk reproducing device comprising: a high frequency enhancing filter receiving a disk reproduction signal and boosting selected high-frequency components of the disk reproduction signal; binarization means receiving an output of said high frequency enhancing filter for binarizing said disk reproduction signal; error detection means receiving an output of said binarization means for detecting an error of the binarized disk reproduction signal; threshold value adjustment means receiving an output of said error detection means and connected to said binarization means for adjusting a binarization threshold value in said binarization means; boost adjustment means receiving an output of said error detection means and connected to said high frequency enhancing filter for adjusting a boost amount of the disk reproduction signal input to said high frequency enhancing filter; and control means controlling a threshold value of said threshold value adjustment means and an adjustment amount of said boost adjustment means to reduce an error detection amount in said error detection means, wherein said control means causes an error rate detection at a prescribed position for each disk input into said disk reproducing device and an adjustment of the binarization threshold value when an error rate by said error detection means is higher than a prescribed value at said prescribed position, and wherein said boost adjustment means performs boost adjustment using a signal having a prescribed cycle of said reproduction signal.