Details to Assist in Implementation of Federal Standard 1016 CELP
NATIONAL COMMUNICATIONS SYSTEM WASHINGTON DC
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The 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. They conducted a survey of 4,800 bits voice coders to select a standard for use in an upgrade of the STU-III to supplement its 2,400 bits LPC-10e vocoder. A code excited linear predictive CELP coder, jointly developed by the DoD and ATT Bell Laboratories, was selected in this survey. Listening tests and Dynastats 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 bits it is even comparable to 32,000 bits continuously variable slope delta-modulation CVSD and is robust in acoustic noise, channel errors, and tandem coding conditions. Code Excited Linear Prediction.
- Computer Systems Management and Standards
- Military Forces and Organizations
- Civil Defense