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:
Dec. 21, 2004
Filed:
Oct. 23, 2002
Taizou Hamada, Osaka, JP;
Yasuaki Ban, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The data row Pw(i) of phase information obtained by reading preformatted phase patterns on an information recording medium by the head consists of the remainders obtained by dividing the data row of the phase information indicating the original track location by 2&pgr;. The data row Pw(i) in a convoluted state is entered; a data row dPw(i) consisting of the differential values between adjacent data in the data row Pw(i) is generated; a two-step differential data row &dgr;Pw(i) consisting of the differential values between adjacent data in the data row dPw(i) is generated; the cumulative coefficient k(i) is adjusted according to the section region where the value of the two-step differential data row &dgr;Pw(i) belongs; a differential data row dPu(i) (=&dgr;Pw(i)+2&pgr;×k(i)) is generated by applying a reconstructing process for solving the convolution process with the use of the found cumulative coefficient k(i); and a reconstructed phase information data row Pu(i) is obtained by further applying integration.