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Simulation of an adaptive speech communications system applicable to time-varying, narrow-band channels

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
<mark>Journal publication date</mark>05/1998
<mark>Journal</mark>SIMULATION
Issue number5
Volume70
Number of pages13
Pages (from-to)291-303
Publication StatusPublished
<mark>Original language</mark>English

Abstract

An adaptive speech and channel coding scheme is described, applicable to the communication of intelligible speech over very narrowband, noisy channels. A fixed- channel bit rate of 1200 bits per second (b/s) is assumed and the channel Eb/N o can drop below 3 decibels. A family of speech coders, derived from a parent coder operating at 1200 b/s, is described which, when combined with a variable rate (punctured) convolutional code, yields an adaptive system capable of operating over a range of channel conditions. The locations of the channel Eb /No threshold points between the various schemes were derived through simulation.