Simulation Of An Adaptive Speech Communications System Applicable To Time-Varying, Narrowband Channels  

Oleh:

Thomas, Bryn ; Honary, Bahram

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Simulation vol. 70 no. 5 (May 1994), page 291-303.
Topik: Digital signal processing; speech processing; codec; channel coder; low bit-rate speech transmission
Fulltext: 291.pdf (934.06KB)

Isi artikel

An adaptive speech and channel coding scheme is described, applicable to the communication of intelligible speech over very narrowband, noisy channels. A fixedchannel 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/N o threshold points between the various schemes were derived through simulation.

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