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. 07, 1998
Filed:
Mar. 18, 1996
Kaneyasu Shimoda, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
Disclosed are an encoding method and demodulating method for a PRML system for maximum-likelihood-detecting and demodulating a encoded partial response signal. The encoding method comprises a step of segmenting an input data string into 4-bit data and a step of converting the 4-bit data into 6-bet code words Y={001011, 001101, 001110, 010011, 010110, 011001, 011010, 011100, 100011, 100101, 100110, 101001, 101100, 110001, 110010, 110100}. The demodulating method includes a maximum likelihood detection step by use of a trellis transition, said trellis transition includes path transitions between status A groups {001A, 010A, 100A, 011A, 101A, 110A} constituting last-half 3 bits of the 6-bit code word and status B groups {001B, 010B, 100B, 011B, 101B, 110B} constituting first-half 3 bits of the 6-bit code word and path transitions from the status B groups to the status A groups including path transitions from 011B, 101B, 110B to 001A, 010A, 100A excluding the path transition from 101B to 010A and path transitions from 001B, 010B, 100B to 011A, 101A, 110A excluding the path transition from 010B to 101A.