A Codification of Error Signal by Splines Functions

One possible way of increasing the low-bit rate speech-coders performance is to consider a parametric glottal model as source for voiced sounds and to approach the glottal waveform using trigonometric functions. The main problem of this procedure is how to determine the opening and closure times. This work proposes an alternative method based on an approximation of the glottal signal by spline functions (particularly cubic splines).Another objective is to remove the influence from the non-white glottal source in the estimation of the parameters of the production filter. In the proposed algorithm, this is obtained using conventional predictive analysis.