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:
Jun. 19, 2007
Filed:
Apr. 18, 2002
Eiji Yamada, Tenri, JP;
Eiji Yamada, Tenri, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
At the preceding stage of a first one of two APP decoders that constitute a turbo decoder, there is provided a logarithmic-likelihood computing circuit that creates and outputs logarithmic likelihoods L(y'|y) of a reproduced signal y′which is soft information. The first APP decoder has an APP decoding function of receiving logarithmic likelihoods L(y′|y) of the reproduced signal yas well as a priori information as to code data c′, updating the code data c′and producing outputs of a posteriori probabilities according to trellis diagram information that satisfy constraints concerning an RLL modulation. Turbo decoding becomes compatible with the RLL demodulation, and a turbo decoding with high error-correcting capability is usable in reproducing channel data arecorded onto a recording medium, which allows a recording density of the recording medium to be increased.