Title :
Envelope and instantaneous phase considerations in speech modelling
Author :
Moreno, Asunción ; Lagunas, Miguel A.
Author_Institution :
ETSI Commun., Barcelona, Spain
Abstract :
The authors present a low-bit-rate coding system where the envelope and instantaneous phase of the residual are used. A time-varying filter (short-delay filter) is excited by a signal composed by a parametric version of the residual, multiplied by a sequence from a codebook. Two alternatives are studied for the design of the codebook: sequences formed by random pulses and sequences formed by random phases to simulate the instantaneous phase of the residual.<>
Keywords :
encoding; filtering and prediction theory; speech analysis and processing; speech synthesis; codebook design; codebook sequences; envelope residual; instantaneous phase considerations; low-bit-rate coding system; parametric version; random phases; random pulses; short-delay filter; speech modelling; time-varying filter; Bit rate; Delay effects; Error analysis; Filters; Fourier transforms; Signal analysis; Signal synthesis; Speech; Telecommunications; Time varying systems;
Conference_Titel :
Circuits and Systems, 1988., IEEE International Symposium on
Conference_Location :
Espoo, Finland
DOI :
10.1109/ISCAS.1988.15228
