Process for interception-protected frequency band compressed tra

Details Process for interception-protected frequency band compressed tra Process for interception-protected frequency band compressed tra

1982-07-23

1985-10-29

Cangialosi, Salvatore

Telegraphy

Systems

Printing

179 15FS, 178 2217, H04K 100, H04L 900

Patent

active

045502226

ABSTRACT:
In order to achieve a good masking, together with minimum bandwidth requirement of sample values of spectral channels which are to be transmitted in the timing of consecutive analysis intervals in a time division multiplex sum signal, and of other predetermined speech parameters which likewise represent sample values, including at least one item of synchronizing information, at the transmitting end, the time-wise overlap of the sample values and of the synchronizing information are effected pseudo-randomly within consecutive frames of the sum signal and the analog sum signal obtained in this manner is transmitted across a shaping network to the receiving end, either directly in its base frequeny, or in a desired higher frequency position, or else indirectly by modulation onto a carrier.

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patent: 4383322 (1983-05-01), Halpern et al.
S 7471 0137H, 27th Annual Conf. IEEE Vehicular Tech. Group, Orlando, Fla., (3/77), pp. 8-11, Bailey "Digitally Encoded Voice Encryption Sytem".
Guanella, G., "Verfahren Zur Automatischen Sprachverschleierung", Brown Boveri; Miheilungen, Dec. 1941, pp. 397-408.

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