Time-frequency scrambler

Telegraphy – Systems – Printing

Patent

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Details

179 15R, 178 2204, H04K 104

Patent

active

045515808

ABSTRACT:
Subband signals are formed each corresponding to a portion of an input signal frequency spectrum. The subband signals are partitioned into subband time segments. The subband time segment signals are permuted. The permuted signals are combined to form a scrambled signal.

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patent: 4443660 (1984-04-01), DeLong
Johnston, "A Filter Family Designed for Use in Quadrature Mirror Filter Banks," Proceedings of 1980 International Conference of Acoustics, Speech and Signal Processing, pp. 291-294, Apr. 1980.
MacKinnon, "The Development of Speech Encipherment," The Radio and Electronic Engineer, vol. 50, No. 4, pp. 147-155, Apr. 1980.

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