Channel coding for code excited linear prediction (CELP) encoded speech in mobile radio applications
Yaacov Yesha · 1994
type of data.For example, the Code Excited Linear Prediction (CELP) algorithm has been adopted by the Federal Government as Federal Standard (FS) 1016, for use in voice coding [2].Wireless channels generally introduce higher error rates than do wireline channels.Therefore, channel coding is also needed, in order to allow for error detection and correction.It is assumed that the reader has a working knowledge of CELP and is familiar with the mobile radio environment.As part of the benchmarking program at NIST, research is currently being undertaken in which the mobile radio channel effects on CELP encoded speech data are studied.This research uses a mix of software and hardware tools to test the channel encoding algorithms and evaluate their error correction performance; see [3] -[5] for a description of previous work.The approach selected for the current study is based on software simulations on a SUN 2 workstation.At later stages of the research Digital Signal Processing (DSP) hardware should be added in order to increase simulation speeds and to allow real-time simulations.'On Leave from Rafael, Israel 2 Certain commercial equipment, instruments, or materials are identified in this paper in order to specify the experimental procedure adequately.Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that the materials or equipment