Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Reexamination Certificate
2006-02-07
2006-02-07
Baker, Stephen M. (Department: 2133)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
C714S769000, C714S780000, C714S792000
Reexamination Certificate
active
06996764
ABSTRACT:
At a preceding stage of a PR-channel APP decoder out of two APP decoders constituting a turbo decoder is disposed a logarithmic-likelihood computing circuit that computes logarithmic likelihoods L(y′i|yi) of a reproduced signal y′i, which is soft information. At a succeeding stage of the PR-channel APP decoder, on the other hand, a likelihood-transform RLL demodulator and a likelihood-transform RLL modulator capable of treating logarithmic likelihood ratios, which are soft information, are disposed between this APP decoder and a convolutional-code APP decoder. Thus, both RLL demodulation and turbo decoding can be fulfilled, and a turbo decoding of high error-correcting capability can be used to reproduce channel data airecorded on a recording medium. As a result, the recording density of the recording medium is enhanced.
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Baker Stephen M.
Conlin David G.
Edwards & Angell LLP
Manus Peter J.
Sharp Kabushiki Kaisha
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