Device for detecting margin of information recording and reprodu

Details Device for detecting margin of information recording and reprodu Device for detecting margin of information recording and reprodu

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.

REFERENCES:
patent: 4646173 (1987-02-01), Kammeyer et al.
patent: 5239528 (1993-08-01), Narahara et al.
patent: 5363412 (1994-11-01), Love et al.
patent: 5465241 (1995-11-01), Narahara
patent: 5680380 (1997-10-01), Taguchi et al.

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