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. 30, 1999
Filed:
Feb. 19, 1997
Hiroaki Ueno, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The present invention relates to a signal reproducing method and a signal reproducing apparatus for reproducing a signal recorded by a high-density recording. The invention avoids deteriorating the performance of an ML detector while suppressing the equalization loss and the correlation noise. The signal reproducing method includes steps of generating a first signal using a first selected number of convolutions, generating a second signal using a second selected number of convolutions, and combining the first and second signals to identify the information in the input signal. The first and second signals can be processed by adding or subtracting the first and second signals, depending on the circuit configuration. With this invention, the number of convolution steps is reduced, and it is possible to reduce equalization loss and correlation noise using circuits having a small circuit scale. When applied to a disk drive, it is possible to improve reliability, reduce circuit scale and reduce the size and weight of the drive. It is also possible to obtain a high-density recording due to the reduced error rate realized by this invention.