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Effects of Intentional Interference with Speech Intelligibility

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The first portion of the paper describes the effects on speech intelligibility of selected noise spectra. It is found that there is a -most efficient- noise spectrum for the intentional destruction of intelligibility, for example to combat eavesdropping. A device called the Vocepter designed specifically to defeat eavesdropping is introduced.

JAES Volume 17 Issue 1 pp. 42-48; January 1969
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AES - Audio Engineering Society