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:
Apr. 16, 1996
Filed:
Jul. 05, 1994
Junichi Nose, Nagaokakyo, JP;
Hideki Kaneko, Nagaokakyo, JP;
Tatsuo Yamasaki, Nagaokakyo, JP;
Ken Onishi, Nagaokakyo, JP;
Masako Yamada, Nagaokakyo, JP;
Taketoshi Hibi, Nagaokakyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
Codewords with CDS=0 are mapped in corresponding relationship to datawords, and codewords with CDS>0 and codewords with CDS<0 are paired together and mapped in corresponding relationship to the remaining datawords, and further, codewords with CDS.noteq.0, left unmapped, are mapped in corresponding relationship to the datawords to which the codewords with CDS=0 have been mapped, thus reducing the probability of occurrence of codewords with large DSV in absolute value terms and thereby achieving a further suppression of low-frequency components. Based on the least significant bit of the codeword corresponding to the last dataword and on the current and next datawords, a codeword corresponding to the current dataword is selected, thus realizing high-density recording with good overwrite characteristics.