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:
Aug. 30, 2005
Filed:
Apr. 03, 2003
Harumitsu Miyashita, Osaka, JP;
Shinichi Konishi, Nara, JP;
Atsushi Nakamura, Osaka, JP;
Takeshi Nakajima, Nara, JP;
Junichi Minamino, Nara, JP;
Harumitsu Miyashita, Osaka, JP;
Shinichi Konishi, Nara, JP;
Atsushi Nakamura, Osaka, JP;
Takeshi Nakajima, Nara, JP;
Junichi Minamino, Nara, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A PRML detector includes a waveform equalizer for equalizing a waveform of a reproduction signal obtained by reproducing marks and non-marks recorded on a recording medium, and a decoder for generating binary-coded data of the reproduction signal based on the waveform equalized by the waveform equalizer. The decoder outputs a temporary data string which is obtained before the binary-coded data is obtained. The waveform equalizer includes an equalizer that includes a delay element that delays propagation of the reproduction signal, a plurality of multipliers that multiply predetermined coefficients by the reproduction signal and the delayed signal from the delay element, and an adder that adds outputs from the plurality of multipliers. A target value judger determines a target value for equalizing based on the temporary data string output from the decoder and a coefficient adaptive controller calculates the predetermined coefficients and adaptively updates the calculated predetermined coefficients for each of a plurality of multipliers.