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. 05, 1999
Filed:
Aug. 16, 1996
Applicant:
Inventor:
Constantin Michael Melas, Los Gatos, CA (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L / ; H04L / ;
U.S. Cl.
CPC ...
375290 ; 375262 ; 375263 ;
Abstract
A method and apparatus for decoding a partial response encoded signal to generate a decoded signal. The first stage of the apparatus, a first delay filter, receives the partial response encoded signal and filters it with a delay characteristic of (1-D.sup.2)(1+D). The second stage, a timing system, generates a digital signal representative of the first filtered signal. The timing system includes an equalizer with an EPR4 equalization characteristic. The third stage, a second delay filter, filters the signal with a delay characteristic of 1-D. The final stage, a partial Viterbi decoder, generates the decoded signal.