Method and installation for masked speech transmission over a te

Details Method and installation for masked speech transmission over a te Method and installation for masked speech transmission over a te

1976-05-20

1980-02-12

Birmiel, Howard A.

179 15S, H04K 100, H04K 104

Patent

active

041885066

ABSTRACT:
A method and an installation for masked or scrambled speech transmission utilize a time-scrambling unit for dividing the speech band into at least two sub-bands, for delaying the one sub-band with respect to the other, and for forming an aggregate signal, and a frequency-scrambling unit for dividing the aggregate signal into at least two second sub-bands of variable band-width, for their cyclic interchanging, and for forming a transmission signal capable of being transmitted over a transmission channel, in order to mask not only the sound character of the speech signals but also the speech rhythm, thus ensuring increased privacy of transmission with high code-changing speed and low sensitivity to distortion.

REFERENCES:
patent: 1542566 (1925-06-01), Mathes
patent: 1819614 (1931-08-01), Mathes
patent: 2411206 (1946-11-01), Guanella
patent: 2510338 (1950-06-01), Guanella
patent: 3124748 (1964-03-01), Webb, Jr.
patent: 3133991 (1964-05-01), Guanella

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