TY - JOUR

T1 - Simulation of an adaptive speech communications system applicable to time-varying, narrow-band channels

AU - Thomas, Bryn

AU - Honary, Bahram

PY - 1998/5

Y1 - 1998/5

N2 - 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.

AB - 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.

KW - Digital signal processing

KW - speech processing

KW - codec

KW - channel coder

KW - low bit-rate speech transmission

U2 - 10.1177/003754979807000504

DO - 10.1177/003754979807000504

M3 - Journal article

VL - 70

SP - 291

EP - 303

JO - SIMULATION

JF - SIMULATION

SN - 0037-5497

IS - 5

ER -