Speech signal scrambler

Details Speech signal scrambler Speech signal scrambler

1978-02-03

1979-05-22

Birmiel, Howard A.

1791752C, 179 1SC, 328151, H04K 100

Patent

active

041561074

ABSTRACT:
A method and circuitry are disclosed in a telephone system for rendering an intelligible speech signal irreversibly unintelligible but recognizable as representing speech. Samples of an electrical speech signal are repetitively generated with a sample duration and duty cycle (ratio of sample-on time to the sum of sample-off time plus sample-on time) lying within prescribed ranges. The prescribed durational range of the samples extends from about 100 milliseconds to about 1 second, which is approximately equal to the range of from 1 to 10 times the period of an average syllabic interval. The prescribed duty cycle range extends from about 20% to about 67%. This sampling technique is combined with other signal distorting techniques to render the final scrambled speech signal irreversible, unintelligible and recognizable as representing speech.

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patent: 4022989 (1977-05-01), Hoppough

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