Method and installation for masked speech transmission over a telephone channel
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United States of America Patent
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-
Feb 12, 1980
Issued Date -
N/A
app pub date -
May 20, 1976
filing date -
Jul 2, 1973
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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