Data decoding method and circuit and information recording...

Details Data decoding method and circuit and information recording... Data decoding method and circuit and information recording...

2006-04-04

2006-04-04

Torres, Joseph D. (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S795000

Reexamination Certificate

active

07024617

ABSTRACT:
In a partial-response maximum-likelihood (PRML) signal detection and processing technique, reduction of data detection error events caused due to medium noise is achieved. For a PRML detection data result obtained after PRML data demodulation, a code error event that depends on a signal distance, and which has a high frequency of occurrences, is noticed and its occurrence probability is estimated. A locally-existing medium noise quantity is estimated from preceding and subsequent code patterns of the PRML detection data result. Based on this, the occurrence probability of the error event is compensated to improve the detection precision. As a result, data modulation with reliability higher than conventional maximum likelihood detection can be realized with a simple circuit structure.

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R.D. Cideciyan et al, “A PRML System for Digital Magnetic Recording”, IEEE Jounral on Selected Areas in Communications, vol. 10, No. 1, Jan. 1992, pp. 38-56.

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