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Variable rate CELP speech coding using widely variable parameter updates
Variable rate code-excited linear prediction speech coding using widely variable parameter updates
by this research. The evaluation CELP coder developed in
CELP parameter update techniques are then developed in
characteristics of the input speech for variable rate CELP
Code-excited, linear prediction (CELP) has become an accepted
detail. Various experiments are run to determine the
develops new techniques, referred to as widely variable CELP
frequency of the CELP spectral parameters to the
frequency through the use of thresholds. New CELP parameter
general CELP coding concepts and several specific fixed and
increased interest in variable rate techniques to provide
interpolation techniques were developed which facilitated
lower average bit rates for a given quality level. This work
measures were developed to vary the parameter transmit
method for low bit rate, high quality coding of digital
parameter updates, which dynamically adapt the transmit
performance of the developed techniques in terms of coding
rate and speech quality. Three key contributions are provided
speech coding. After a presentation of speech coding basics,
speech. The success of fixed rate CELP schemes has led to
this work is the first known CELP configuration to utilize a
variable frame rate. Formant and pitch parameter distortion
variable rate CELP coders are described. The widely variable
widely variable parameter updates and provided a means for
"Major subject: Electrical Engineering".
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