Cryptography – Communication system using cryptography – Circuit switched network
Patent
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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"Secure Voice-Bandwidth Modem", 1982 Carnahan Conference on Security Technology, R. J. Cosentino, 5/12/82, pp. 1-14.
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"Correlative (Partial Response) Techniques and Applications to Digital Radio Systems," Digital Communications: Microwave Applications, Chapter 7, K. Feher, pp. 144-182.
Atlantic Telephone and Telegraph Company, AT&T Bell Laboratories
Cangialosi Salvatore
Cubert Jack S.
Lewis Aaron J.
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