An elevation of 4800 bps voice coders

Abstract

In May 1987 the US Department of Defense announced a survey of 4800-b/s voice coders and invited any interested parties to submit voice-coding algorithms for evaluation. The goals of the survey were to identify a 4800-b/s coder suitable for use in digital secure telephones and to provide a snapshot of the current state of voice-coding technology at that rate. Ten candidate algorithms were submitted by university, commercial, and government organizations. They were extensively tested for intelligibility, voice quality, and robustness, and rated on a set of criteria including complexity, error tolerance, coding delay, maturity, and expandability. A description is given of the evaluation process, and the results are presented.

Keywords

This publication has 7 references indexed in Scilit:

Quality comparison of low complexity 4800 bps self excited and code excited vocoders
Published by Institute of Electrical and Electronics Engineers (IEEE) ,2005
An expandable error-protected 4800 bps CELP coder (US Federal Standard 4800 bps voice coder)
Published by Institute of Electrical and Electronics Engineers (IEEE) ,2003
Improved speech quality and efficient vector quantization in SELP
Published by Institute of Electrical and Electronics Engineers (IEEE) ,2003
Strategies for improving the performance of CELP coders at low bit rates (speech analysis)
Published by Institute of Electrical and Electronics Engineers (IEEE) ,2003
Computationally efficient sine-wave synthesis and its application to sinusoidal transform coding
Published by Institute of Electrical and Electronics Engineers (IEEE) ,2003
A 4.8 kbps multi-band excitation speech coder
Published by Institute of Electrical and Electronics Engineers (IEEE) ,2003
Experiments with a high quality, low complexity 4800 bps residual excited LPC (RELP) vocoder
Published by Institute of Electrical and Electronics Engineers (IEEE) ,2003