Thomas, Bryn and Honary, Bahram (1998) Simulation of an adaptive speech communications system applicable to time-varying, narrow-band channels. SIMULATION, 70 (5). pp. 291-303. ISSN 0037-5497
Full text not available from this repository.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.