Patent
1978-01-03
1980-03-25
Birmiel, Howard A.
179 15R, H04K 104
Patent
active
041952022
ABSTRACT:
A voice privacy system enhances the privacy of a transmission by disguising the amplitude characteristics and cadence content of transmitted voice signals. Encoding apparatus first divides a voice signal to be transmitted into two or more frequency bands. One or more of the frequency bands is frequency inverted, delayed in time relative to the other frequency bands and then recombined with the other frequency bands to produce a composite signal for transmission to a remote receiver. By selecting the magnitude of the delay to approximate the time constants of the cadence, or intersyllabic and phoneme generation rates, of the speech to which the voice signal corresponds, the amplitude fluctuations of the composite signal are substantially lessened and the cadence content of the signal is effectively disguised. It thus becomes extremely more difficult for unauthorized listeners to extract cadence information from the signal as a means of extracting intelligence from the signal. Decoding apparatus at the receiver reconstitutes the original voice signal.
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patent: 1921063 (1933-08-01), Affel
patent: 2411683 (1946-11-01), Guanella
patent: 3201517 (1965-08-01), Gannett
patent: 3723878 (1973-03-01), Miller
patent: 3879578 (1975-04-01), Wildi
patent: 4068094 (1978-01-01), Affel
patent: 4099027 (1978-07-01), Whitten
Birmiel Howard A.
Technical Communications Corporation
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