Patent ID: 6078451
Filing Date: 2000-06-20
Classification: G11B

Abstract:
A method for retrieving data from a recording medium containing a data area in which a series of pulses are stored, comprising the steps of:generating a data window signal used to detect the data pulses in a pulse series read from the recording medium;comparing the pulse series with a plurality of stored bit patterns having at least one transition located at a fixed interval from a detection point in the stored bit pattern, and having a peak at which no peak shift occurs; andwhen a stored bit pattern is found in the pulse series, measuring a variable interval from the detection point to the transition in the pulse series then:calculating a deviation as a function of the fixed interval and the variable interval; andusing the deviation to adjust a phase of the data window signal to reduce a difference between a center of the data window signal and a center of a data pulse.