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. 06, 2004
Filed:
Nov. 13, 2001
Youichi Ogura, Ehime, JP;
Koichi Urita, Ehime, JP;
Shinichiro Sato, Ehime, JP;
Yoshimasa Oda, Ehime, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In a digital recorded data reproduction which applies PRML signal processing, it is an object to enhance a reproduction signal quality and a playability for an abnormal signal by an offset correction and a phase-interpolation-type digital phase-locked loop. A prescribed frequency band of a reproduction signal is emphasized by a waveform equalizing unit and its output signal is sampled by an asynchronous clock at an analog/digital converter After a sampling signal is subjected to the offset correction, PR equalization is performed by a transversal filter and a tap weighting factor control unit which applies LMS algorithm, and a signal of a regular sampling phase is reproduced from its output signal by a high-order interpolation filter employing a digital phase-locked loop . The reproduced signal in a regular phase is demodulated by a maximum likelihood decoder thereby to reproduce digital data recorded on a medium.