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:
Nov. 23, 2010
Filed:
Aug. 15, 2007
Tomokazu Sada, Osaka, JP;
Masaru Fuse, Osaka, JP;
Satoshi Furusawa, Osaka, JP;
Tsuyoshi Ikushima, Nara, JP;
Tomoaki Ohira, Osaka, JP;
Tomokazu Sada, Osaka, JP;
Masaru Fuse, Osaka, JP;
Satoshi Furusawa, Osaka, JP;
Tsuyoshi Ikushima, Nara, JP;
Tomoaki Ohira, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A data communication apparatus improves security against eavesdropping for secret communication by using Y-00 protocol. A multi-level code generation section generates, based on key information, a multi-level code sequence in which a signal level changes so as to be approximately random numbers. A level conversion section irreversibly converts the multi-level code sequence such that a converted multi-level code sequence does not constitute a mapping of the multi-level code sequence. A multi-level processing section generates a multi-level signal having a plurality of levels each corresponding to a combination between the information data and the multi-level code sequence. A modulator section modulates a multi-level signal in a predetermined modulation method and outputs a modulated signal.