Expanded partial response processing for analog signal encipheri

Details Expanded partial response processing for analog signal encipheri Expanded partial response processing for analog signal encipheri

1985-06-24

1988-06-28

Cangialosi, Salvatore

Cryptography

Communication system using cryptography

Circuit switched network

380 6, H04L 900

Patent

active

047544813

ABSTRACT:
Partial response signal processing is applied to samples of an analog signal quantized in an amplitude range having a sufficient number of levels that a sample amplitude error of a small percentage of the total levels of the range is not readily perceptible to the human auditory function and that it exhibits tolerable quantizing noise. Samples received into the processing in a transmitting station are sample masked for privacy enciphering. Complementary processing is employed for a receiving station.

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patent: 4283602 (1981-08-01), Adams et al.
patent: 4398062 (1983-08-01), McRae et al.
"Secure Voice-Bandwidth Modem", 1982 Carnahan Conference on Security Technology, R. J. Cosentino, 5/12/82, pp. 1-14.
"Sampling-Based Techniques For Voice Scrambling," ICC '80 Conference Record, S. B. Weinstein, 1980, vol. 1, pp. 16.2.1-16.2.6.
"An Effecient Technique for Sample-Masked Voice Transmission," IEEE Journal on Selected Areas in Communications, R. J. Cosentino, May 1984, vol. SAC-2, No. 3, pp. 426-433.
"Correlative (Partial Response) Techniques and Applications to Digital Radio Systems," Digital Communications: Microwave Applications, Chapter 7, K. Feher, pp. 144-182.

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