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:
Jul. 29, 2025
Filed:
Jul. 19, 2023
Western Digital Technologies, Inc., San Jose, CA (US);
Richard Galbraith, Rochester, MN (US);
Iouri Oboukhov, Rochester, MN (US);
Jonas Goode, Lake Forest, CA (US);
Niranjay Ravindran, Rochester, MN (US);
Pradhan Bellam, Rochester, MN (US);
Henry Yip, Bellflower, CA (US);
Western Digital Technologies, Inc., San Jose, CA (US);
Abstract
Example systems, read channel circuits, data storage devices, and methods to use a global variance parameter based on mutual information to modify operation of a soft output detector in a read channel are described. The read channel circuit includes a soft output detector, such as a soft output Viterbi algorithm (SOVA) detector that includes variance terms. The variance terms are modified by a global variance parameter based on mutual information values. The soft output detector processes an input signal using the modified branch variance terms to determine data bits and corresponding soft information for decoding data in the read channel.