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:
Feb. 16, 1999
Filed:
Feb. 13, 1997
Masakazu Taguchi, Kanagawa, JP;
Michio Matsuura, Kanagawa, JP;
Yoshihide Fujita, Kanagawa, JP;
Akihiro Itakura, Kanagawa, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A data reproduction apparatus assuring compatibility of optical disks capable of reproducing both pit-position recorded data and edge-position recorded data in optical disks by digital operation by using digital values obtained by sampling reproduction signals. A reproduction signal obtained by an optical head is converted into a digital value by a first A/D converter, and on the basis of the converted digital value, pit-position recorded data is recorded by a pit-position detector. Moreover, the reproduction signal obtained by the optical head is converted into digital values by first and second A/D converters, and on the basis of the converted digital values, front edge and rear edge maximum likelihood decoded data of edge-position recorded data are detected by first and second maximum likelihood detectors, and both maximum likelihood decoded data are synthesized by a synthesizer.