Dynamic magnetic information storage or retrieval – General processing of a digital signal
Reexamination Certificate
2005-06-28
2005-06-28
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
C360S065000, C360S046000
Reexamination Certificate
active
06912099
ABSTRACT:
A repeatable run-out (RRO) detector employs one or more digital interpolators to interpolate asynchronous sample values representing an RRO address mark (AM) and RRO data, an asynchronous maximum-likelihood (AML) detector to detect the RRO AM, and a RRO data decoder to decode the RRO data. The AML detector employs an AML algorithm, such as a Viterbi algorithm, to detect the series of peaks of the RRO AM based on detection of the entire sequence of observed peaks. AML detection selects one of either the asynchronous or interpolated sample sequences that are closest in distance to the ideal RRO AM sample sequence. Once the RRO AM is detected, the AML detector provides a RRO AM found signal as well as the selected one of the sample sequences having the best phase for detecting and decoding the RRO data.
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Annampedu Viswanath
Aziz Pervez M.
Agere Systems Inc.
Hudspeth David
Kapadia Varsha A.
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