Abstract
In 1984, the U.S. DoD launched a program to develop a third-generation secure telephone unit (STU-III) capable of providing secure voice communications to all segments of the Federal Government and its contractors. In 1988, the DoD conducted a survey of 4800 bit per second (bps) voice coders to select a standard for use in an upgrade of the STU-III to supplement its 2400 bps LPC-10e vocoder. A code excited linear predictive (CELP) coder, jointly developed by the DoD and AT&T Bell Laboratories, was selected in this survey [1]. Listening tests and Dynastat’s diagnostic rhyme test (DRT) and diagnostic acceptability measure (DAM) show this revolutionary coder outperforming all U.S. Government standards operating at rates below 16,000 bps; it’s even comparable to 32,000 bps continuously variable slope delta modulation (CVSD) and is robust in acoustic noise, channel errors, and tandem coding conditions.
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References
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© 1991 Springer Science+Business Media New York
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Campbell, J.P., Tremain, T.E., Welch, V.C. (1991). The Dod 4.8 Kbps Standard (Proposed Federal Standard 1016). In: Atal, B.S., Cuperman, V., Gersho, A. (eds) Advances in Speech Coding. The Springer International Series in Engineering and Computer Science, vol 114. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3266-8_13
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DOI: https://doi.org/10.1007/978-1-4615-3266-8_13
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