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 ATT 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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