Patent ID: 7639580

Claim:
An optical disk player comprising: a radio frequency (RF) unit configured to generate an RE signal from information stored on an optical disk; a defect signal detector configured to generate a defect signal from the RF signal; an enable unit configured to detect a maximum or minimum edge interval value from among a plurality of edge interval values by a plurality of leading edges generated in each frame of burst cutting area (BCA) information included in the defect signal and generating a latch pointer signal corresponding to a disk rotational speed based on the detected maximum or minimum edge interval value; and a decoder configured to generate BCA data by decoding the defect signal using the latch pointer signal; wherein the enable unit comprises: a frequency detector configured to detect edge signals indicating the leading edges, to update the maximum or minimum edge interval value indicating the disk rotational speed of the optical disk for a respective frame, and to output the updated interval value; and a latch pointer generator configured to generate the latch pointer signal based on the maximum or minimum edge interval value and to compensate for a location of the latch pointer signal; and wherein the frequency detector comprises: an edge detector configured to detect the edge signal, to count the leading edges, and to generate a frame signal indicating one frame; an edge interval detector configured to calculate and output interval values between the leading edges; a storage unit configured to update and store an interval value that is output from the edge interval detector only if the interval value is larger than a previous interval value in a frame, and to maintain and output a value updated as the maximum edge interval value of one frame during a subsequent frame in response to the frame signal; and a loop filter configured to filter the updated maximum edge interval value in response to the frame signal, and to output the filtered value as an edge interval value indicating the rotational frequency of the optical disk.