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1 December 1995 Experimental verification of chaotic encryption of audio using monolithic chaotic modulators
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Proceedings Volume 2612, Chaotic Circuits for Communication; (1995)
Event: Photonics East '95, 1995, Philadelphia, PA, United States
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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Delgado-Restituto, Angel Rodriguez-Vazquez, and M. Linan "Experimental verification of chaotic encryption of audio using monolithic chaotic modulators", Proc. SPIE 2612, Chaotic Circuits for Communication, (1 December 1995);

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