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:
Apr. 23, 2002
Filed:
Jun. 24, 1999
Tadaaki Yoshinaka, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
This invention relates to a digital signal reproducing apparatus. This invention is applicable to an apparatus such as a video tape recorder and an optical disk drive, using a Viterbi decoder therein. Noise characteristics are equalized at points of discrimination by adding an equalized signal SPR of a differential system and an equalized signal SPR of an integrating system in a weighted manner, or by adding up metrics Maa-Mbb, (Ma′, Mb′) relative to amplitude reference values calculated for the two equalized signals SPR and SPR over each of relevant paths in a weighted fashion. The arrangements allow the inventive apparatus to avert noise-induced deterioration of discrimination accuracy.