Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, VOL. 5, NO. 2, MARCH 1997 131 A Perceptually Based Embedded
 

Summary: IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, VOL. 5, NO. 2, MARCH 1997 131
A Perceptually Based Embedded
Subband Speech Coder
Benjamim Tang, Member, IEEE, Albert Shen, Member, IEEE,
Abeer Alwan, Member, IEEE, and Gregory Pottie, Member, IEEE
Abstract-- A new scheme for robust, high-quality, embedded
speech coding based on subband decomposition and percep-
tually optimized bit allocation and prioritization is presented.
An infinte impulse response (IIR) quadrature mirror filterbank
(QMF) performs subband decomposition. A perceptual model,
computed using subband spectral analysis, optimizes the coder's
perceptual quality. Dynamic bit allocation and prioritization is
combined with embedded quantization resulting in little perfor-
mance degradation relative to a nonembedded implementation.
The coder output is scalable from high quality at higher bit rates
to lower quality at lower bit rates, supporting a wide range of
service and resource utilization. The lower bit-rate representation
is obtained simply through truncation of the higher bit-rate rep-
resentation. Since source-rate adaptation is performed through
truncation of the encoded stream, interaction with the coder is

  

Source: Alwan, Abeer - Electrical Engineering Department, University of California at Los Angeles

 

Collections: Computer Technologies and Information Sciences