MAXIMUM LIKELIHOOD DETECTION OF ASYNCHRONOUS SERVO DATA EMPLOYING INTERPOLATION

摘要

PROBLEM TO BE SOLVED: To provide maximum likelihood detection of asynchronous servo data employing interpolation.;SOLUTION: A repeatable run-out (RRO) detector employs one or more digital interpolation circuits to interpolate asynchronous sample values representing an RRO address mark (AM) and RRO data ; an asynchronous maximum likelihood (AML) detector detects RRO AM; and a RRO data decoder decodes the RRO data. The AML detector employs an AML algorithm, such as Viterbi algorithm, to detect a series of peaks of RRO AM based on detection of the entire sequence of observed peaks. The AML detection selects one of either the asynchronous or interpolated sample sequences that are closest in distance to the ideal PRO AM sample sequence. Once the RRO AM is detected, the AML detector provides RRO AM found signal as well as the selected one of the sample sequences having the best phase for detecting and decoding the PRO data.;COPYRIGHT: (C)2005,JPO&NCIPI