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:
Sep. 21, 2010
Filed:
Jan. 09, 2007
Masaru Fuse, Osaka, JP;
Satoshi Furusawa, Osaka, JP;
Tsuyoshi Ikushima, Nara, JP;
Tomokazu Sada, Osaka, JP;
Masaru Fuse, Osaka, JP;
Satoshi Furusawa, Osaka, JP;
Tsuyoshi Ikushima, Nara, JP;
Tomokazu Sada, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A data communication apparatus which causes the eavesdropper to take a significantly increased time to analyze a cipher text and provides high concealability is provided. A multi-level code generation sectiongenerates, based on predetermined key information, a multi-level code sequencein which a signal level changes so as to be approximately random numbers. A multi-level processing sectioncombines the multi-level code sequenceand information data, and generates a multi-level signalhaving a plurality of levels corresponding to the combination of the multi-level code sequenceand the information data. A modulator sectiontreats the multi-level signal a predetermined modulating processing and generates a modulated signal. The multi-level code generation sectiongenerates the multi-level code sequencein accordance with a changed random number sequence which results from changing a bit series of a binary random number sequence generated based on the predetermined key information.