Information recording and reproducing apparatus, evaluation...

Details Information recording and reproducing apparatus, evaluation... Information recording and reproducing apparatus, evaluation...

2006-11-21

2006-11-21

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

Binary pulse train information signal

Including sampling or a/d converting

C369S047150, C369S124010

Reexamination Certificate

active

07139231

ABSTRACT:
An evaluation method for calculating an identification signal by using PRML, comprises a table storing true patterns and ideal signals thereof, false patterns corresponding to the true patterns and ideal signals thereof, and Euclidean distance between the true pattern and the false pattern, a calculating unit, when a recording signal synchronized with an identification signal coincides with any pattern of the table, calculates a distance between Euclidean distance between the ideal signal of the true pattern and a reproduction signal and Euclidean distance between the ideal signal of the false pattern and a reproduction signal, and an evaluation unit which evaluates an identification signal by using an average and standard deviation of difference. A table for patterns is created for a likely mistaken pattern, whereby calculating an evaluation value with high precision, of a signal quality, with a small amount of calculation.

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Tetsuya Okumura et al., “A Method for Evaluating PRML System Reliability Using Sequenced Amplitude Margin,” Technical Digest, International Symposium on Optical Memory 2001 (ISOM '01) (Japan), p. 272-273.

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