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:
Jan. 01, 2019
Filed:
Sep. 19, 2017
Marvell International Ltd., Hamilton, BM;
Seyed Mehrdad Khatami, Foster City, CA (US);
Mats Oberg, San Jose, CA (US);
Marvell International Ltd., Hamilton, BM;
Abstract
A system for compensating RI while reading servo data from a rotating storage medium is provided and includes an equalizer, a Viterbi detector, and a servo control module. The equalizer receives a digital signal including a bit sequence of the servo data read from the rotating storage medium and equalizes the digital signal via filters. Some of the filters are to phase rotate the digital signal to generate phase rotated signals. The Viterbi detector operates based on a Viterbi state machine, which includes main branches having sub-branches, where: each of the main branches is to receive the phase rotated signals respectively at corresponding ones of the sub-branches; and the Viterbi detector is to determine branch metrics for each of the sub-branches, determine a minimum branch metric for each of the main branches, and process the minimum branch metric using an add-compare-select process to determine a most likely received bit sequence.