Patent ID: 6259660
Filing Date: 2001-07-10
Classification: G11B

Abstract:
An optical signal processing circuit comprising:a sync. code detection circuit for detecting sync. codes included in a recording sector of an optical disk, said sector including a plurality of frames and each of the frames including a sync. code and data;a frame number detection circuit for detecting a frame number of the frame based on the sync. code output from said sync. code detection circuit;a frame number counter for counting the frame number output from said frame number detection circuit;an out-of-sync. detection circuit for detecting the periodicity of the sync. codes output from said sync. code detection circuit and outputting an out-of-sync. signal when the periodicity is disturbed; anda frame number correction signal generating circuit for generating a control signal for correcting the frame number of said frame number counter in an error correction unit based on the out-of-sync. signal output from said out-of-sync. detection circuit and an output signal of said frame number detection circuit and supplying the control signal to said frame number counter.