Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2006-03-28
2006-03-28
Peeso, Thomas R. (Department: 2132)
Cryptography
Video cryptography
Video electric signal modification
C380S236000, C713S152000, C713S152000
Reexamination Certificate
active
07020286
ABSTRACT:
A system for modulating and demodulating signals that provides a new class of signal modulators and their corresponding demodulators. The modulation scheme embeds in an information signal a carrier signal by modulating the oscillatory rate of the carrier signal. The invention generalizes the possible carrier signals to any signal which can be generated by a dynamical system that have a known exponentially convergent observer, as in certain chaotic systems.
REFERENCES:
patent: 5402334 (1995-03-01), Pecora et al.
“Synchronization of Lorenz-Based Chaotic Circuits with Applications to Communications,” Cuomo et al. IEEE Transactions on Circuits and Systems. Oct. 1993. vol. 40, No. 10.
“Multi-User Communication using Chaotic Frequency Modulation,” Volkovskii et al. IEEE Transactions on Circuits and Systems. 2001.
“Synchronization and Communication Using Chaotic Frequency Modulation,” Volkovskii et al. Institute for Nonlinear Science. Mar. 23, 1999.
“Current Problems for the Transmission of Information Using a Chaotic Signal,” Martin Hasler. Swiss Federal Institute of Technology. 1997.
Oppenheim Alan V.
Rosales Rodolfo R.
Torres Wade P.
Massachusetts Institute of Technology
Peeso Thomas R.
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