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Proceedings Paper

Experimental verification of chaotic encryption of audio using monolithic chaotic modulators
Author(s): M. Delgado-Restituto; Angel Rodriguez-Vazquez; M. Linan
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Paper Abstract

This paper reports the first experimental verification of chaotic encryption of audio signals using integrated circuits. It is based on a gm-C modulator/demodulator analog CMOS IC that implements a 3rd-order nonlinear differential equation. This has been fabricated in 2.4 micrometer double-poly technology and includes on-chip tuning circuitry based on amplitude detection. It is capable of generating controllable continuous-time chaotic signals. Also, measurements demonstrate how to exploit the synchronization between two of them for encrypted transmission. In these experiments, the worst-case signal to noise ratio of the recovered signal is greater than +40 dB (at the low corner of the audio spectrum) with less than -0.2 dB loss of the input signal power. At higher frequencies, the signal-to- noise ratio rises up to +60 dB, while retaining similar losses at the receiver.

Paper Details

Date Published: 1 December 1995
PDF: 5 pages
Proc. SPIE 2612, Chaotic Circuits for Communication, (1 December 1995); doi: 10.1117/12.227890
Show Author Affiliations
M. Delgado-Restituto, CNM (Spain)
Angel Rodriguez-Vazquez, CNM (Spain)
M. Linan, CNM (Spain)

Published in SPIE Proceedings Vol. 2612:
Chaotic Circuits for Communication
Jaafar M. H. Elmirghani, Editor(s)

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