Microprocessor based voice scrambling techniques

Ismail, Shaik (1985) Microprocessor based voice scrambling techniques. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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Abstract

The memorandum presents an overview as well as the13; microprocessor-based implementation of the generally accepted basic techniques for scrambling the voice signals. Spectrum Inversion, Time Segment Permutation and Reversed Time Segmentation are the analogue techniques implemented. Digital encryption of the voice signals is done by pseudorandom number masking. A Simplex communication system is designed and constructed. The heart of both the transmitter and the receiver is a microcomputer based on an 8-bit microprocessor (Inte1 8085). The PCM technique is used to digitize voice signals. The microprocessor is found to be an ideal device for carrying out the signal processing necessary for scrambling and descrambling. The scrambling techniques discussed here have fixed codes.

Item Type: Monograph (Technical Report)
Uncontrolled Keywords: Voice scrambling;Digia1 encryption;Microprocessor based scrambler
Subjects: ENGINEERING > Quality Assurance and Reliability
ENGINEERING > Electronics and Electrical Engineering
Depositing User: Users 90 not found.
Date Deposited: 27 Nov 2006
Last Modified: 24 May 2010 04:23
URI: http://nal-ir.nal.res.in/id/eprint/3516

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