Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Patent
1997-06-24
1999-08-17
Grant, William
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
714796, 333 28, 379 41, 379 51, 379 671, 360 18, 360 26, 360 51, 360 27, G06F 1110
Patent
active
059387912
ABSTRACT:
An information recording and reproducing apparatus provided with the maximum likelihood decoding utilizes a standard deviation of difference metrics as an estimating function for adjustment for the purpose of achieving a short-time adjustment with a small number of samples. A regenerative clock and a reproduction signal outputted from the information recording and reproducing apparatus are supplied to a maximum likelihood decoder. Based on the estimated recorded series detected by the maximum likelihood decoder at a low error rate, a recording state detector generates a recorded bit series. Then, a standard deviation calculator operates to select a difference metric delayed by a detected amount by a display line from the difference metrics outputted from the maximum likelihood decoder and derives the standard deviation of the difference metrics. Then, a .sigma..sub.-- .DELTA.m/.mu..sub.-- .DELTA.m minimizing controller operates to adjust a shift of a sampling phase and a track offset of the information recording and reproducing apparatus so that the standard deviation .sigma..sub.-- .DELTA.m is made minimal.
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patent: 4646173 (1987-02-01), Kammeyer et al.
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patent: 5363412 (1994-11-01), Love et al.
patent: 5465241 (1995-11-01), Narahara
patent: 5680380 (1997-10-01), Taguchi et al.
Grant William
Marc McDieunel
Sony Corporation
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