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Definition of speech privacy PDF Print E-mail
Question: Where is the best, most concise definition of speech privacy?

Answer: Speech privacy is succinctly defined in the Glossary of American National Standard T.1-523-2001, a standard maintained by the U.S. Department of Commerce, Natioal Telecommunications and Information Administration, Information Security program (INFOSEC). This standard states that speech privacy means: "methods used to render speech unintelligible to the casual listener." This definition embodies two key concepts:
(a) the measurement of intelligibility/unintellibility, which is a practice familiar to five generations of acoustics professionals since the first work done on the Articulation Index in the 1940's by Leo Beranek and others.
(b) the viewpoint of the "casual listener." That is, this definition of speech privacy does not cover intentional or assisted listening.
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