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. 23, 2005
Filed:
Jul. 25, 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 waveform equalizer for equalizing a waveform of a reproduction signal. A delay element delays a propagation of the reproduction signal. A plurality of multipliers multiply predetermined coefficients by the reproduction signal and the delayed propagation reproduction signal. A detector detects an asymmetry of the reproduction signal arising from physical profiles of each of the marks and the non-marks, and outputs a detection signal representing an amount of asymmetry. A discriminator outputs a discrimination signal in response to a discrimination of the marks and the non-marks. A calculator calculates a first coefficient multiplied by the reproduction signal of the marks based on the outputted detection signal, and calculates a second coefficient multiplied by the reproduction signal of the non-marks. A selector selects either the first or second coefficient, based upon the outputted discriminating signal.