Data transmitting apparatus and data receiving apparatus

Details Data transmitting apparatus and data receiving apparatus Data transmitting apparatus and data receiving apparatus

2011-03-15

2011-03-15

Phu, Phuong (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

C375S261000, C375S264000, C375S286000, C380S255000, C380S270000, C380S277000, C380S031000

Reexamination Certificate

active

07907670

ABSTRACT:
A data communication apparatus which improves security against eavesdropping is provided for secret communication using Y-00 protocol. In a data transmitting apparatus101, a multi-level code generation section111generates, based on key information11, a multi-level code sequence12in which a signal level changes so as to be approximately random numbers. A multi-level processing section112generates a multi-level signal13having a plurality of levels each corresponding to a combination between information data10and the multi-level code sequence12. A level conversion section113divides the plurality of levels of the multi-level signal13into several groups, and allocates one level of a converted multi-level signal21to a plurality of levels included in each of the several groups in an overlapped manner. The level conversion section113then converts the multi-level signal13into the converted multi-level signal21. A modulator section114modulates the converted multi-level signal21and outputs a modulated signal14.

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patent: 7471790 (2008-12-01), Yoshida et al.
patent: 7813433 (2010-10-01), Moffatt
patent: 2006/0280307 (2006-12-01), Ikushima et al.
patent: 2008/0095544 (2008-04-01), Fuse et al.
patent: 2005-057313 (2005-03-01), None

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