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:
Jul. 04, 2006
Filed:
Jan. 31, 2005
Mario Blaum, San Jose, CA (US);
Roy D. Cideciyan, Ruschlikon, CH;
Evangelos S. Eleftheriou, Zurich, CH;
Richard Leo Galbraith, Rochester, MN (US);
Ksenija Lakovic, San Jose, CA (US);
Thomas Mittelholzer, Zurich, CH;
Travis Oenning, Rochester, MN (US);
Bruce A. Wilson, San Jose, CA (US);
Mario Blaum, San Jose, CA (US);
Roy D. Cideciyan, Ruschlikon, CH;
Evangelos S. Eleftheriou, Zurich, CH;
Richard Leo Galbraith, Rochester, MN (US);
Ksenija Lakovic, San Jose, CA (US);
Thomas Mittelholzer, Zurich, CH;
Travis Oenning, Rochester, MN (US);
Bruce A. Wilson, San Jose, CA (US);
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
Non-uniform modulation encoding techniques are provided to prevent data from containing bit patterns that are prone to errors during read back. Modulation encoding is performed on a data stream to remove error prone bit patterns. Unconstrained data, such as error check parity, that is inserted into the modulated data stream may contain error prone bit patterns. Stricter modulation constraints are enforced on bits that are next to the unconstrained data, than on the remaining bits. By enforcing stricter modulation constraints on these bits, an entire data bit stream can have a desired modulation constraint.