Recording and reproducing apparatus, signal decoding...

Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction

Reexamination Certificate

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C714S795000, C375S341000

Reexamination Certificate

active

10161228

ABSTRACT:
A recording and reproducing apparatus having an ECC-less error correction function, includes an erasure detector generating an erasure flag indicating erasure of a read signal; and an iterative decoder having two soft-in/soft-out (SISO) decoders, i.e., an inner decoder and an outer decoder, and correcting the erasure by inputting the erasure flag ekinto the inner decoder and performing erasure compensation in the inner decoder. As the erasure compensation in the inner decoder, channel information is masked while the erasure flag is on. The erasure of data due to a media defect is detected inside the iterative decoder, and the second erasure flag is inputted into the inner decoder to perform erasure compensation in the inner decoder.

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On Reverse Concatenation and Soft Decoding Algorithms for PRML Magnetic Recording Channels; IEEE Journal on Selected Areas in Communications; vol. 19, No. 4; Apr. 2001; pp. 612-618.

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