Patent ID: 6314074
Filing Date: 2001-11-06
Classification: G11B,H03L

Abstract:
A recording information reproducing apparatus for reproducing information data corresponding to recording information recorded on a recording medium on the basis of a read signal read out from said recording medium, comprising:a PLL circuit for generating an oscillation signal whose phase is synchronized with that of a read sampling value sequence obtained by sampling said read signal at a timing according to a clock signal and using said oscillation signal as said clock signal;phase correcting means for obtaining a sampling value sequence derived at a time point when the phase in said read sampling value sequence is deviated by an amount corresponding to a phase error which occurs in said read sampling value sequence and setting said sampling value sequence to a corrected read sampling value sequence; anddecoding means for executing a decoding process to said corrected read sampling value sequence, thereby obtaining said information data,wherein said phase correcting means comprises:phase error detecting means for detecting a phase error between said corrected read sampling value sequence and said clock signal;a loop filter for obtaining a correction signal by filtering said phase error; anda delay variable filter for obtaining a sampling value sequence which is derived at a time point when the phase is deviated by a time corresponding to said correction signal on the basis of said read sampling value sequence and setting said sampling value sequence to said corrected read sampling value sequence.