The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 07, 2006
Filed:
Apr. 18, 2002
Eiji Yamada, Tenri, JP;
Eiji Yamada, Tenri, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
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'|y) of a reproduced signal y′, 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 arecorded on a recording medium. As a result, the recording density of the recording medium is enhanced.