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:
Mar. 28, 2000
Filed:
Dec. 05, 1997
Yasuo Ido, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A dc balance-value calculation circuit is used in a recording signal generator for performing the block coding of original data to generate a code word having a series of at least two non-inverted bits and generating a recording signal based on the code word. The dc balance-value calculation circuit calculates a dc balance value representing a shift in the dc balance of the recording signal. The dc balance-value calculation circuit includes: selection means for separating the code word generated by the block coding into unit data of a plurality of bits, and selectively outputting the unit data; determination means for determining a change in a dc balance value for each unit data, based on the unit data output by the selection means; and dc-balance-value calculation means for calculating a dc balance value in accordance with the determination result by the determination means.