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:
Nov. 28, 2000
Filed:
Mar. 04, 1998
Satoshi Itoi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A data-reproducing device includes: a subtraction absolute value circuit for calculating a substraction absolute value from pre-equalized reproduce data and estimate data output from RAM, outputting the subtraction absolute value as branchmetrics; a comparison and selection circuit for comparing addition values of the branchmetrics and previously calculated pathmetrics are added, selecting a smaller one of the values as the result of comparison, outputting the smaller one of the values as new pathmetric as well as a selection signal as to which of the values is selected; a path memory circuit for storing the selection signal, obtaining the most probable path by unifying paths, outputting the most probable data according to the most probable path; a RAM circuit for outputting estimate data judged to be closest to the pre-equalized reproduce data by using a present output of the path memory circuit as an address; and a data correction circuit for renewing an internal data of the RAM circuit based upon a data obtained by using, as an address, the pre-equalized reproduce data delayed by a predetermined value and continuous data output from the path memory circuit.