Sixth European Conference on Speech Communication and Technology

Budapest, Hungary
September 5-9, 1999

Study of the Influence of Noise Pre-Processing on the Performance of a Low Bit Rate Parametric Speech Coder

Gwénaél Guilmin (1,2), Régine Le Bouquin-Jeannès (2), Philippe Gournay (1)

(1) Thomson-CSF Communications, Gennevilliers, France
(2) Laboratoire de Traitement du Signal et de l’Image, Université de Rennes, Campus de Beaulieu, Rennes, France

This paper describes a prospective study of the contribution of a single-sensor noise pre-processing method, prior to coding, to the performance of a parametric low bit rate speech coder in adverse conditions. The 2.4kbits/s vocoder we use estimates four parameters: fundamental frequency, voicing, linear prediction coefficients and energy. Firstly, we study the influence of different noise levels on the estimated parameters with and without noise reduction system. Secondly, we measure the contribution of (i) each speech coder parameter and (ii) the speech enhancement system to the global output intelligibility. Finally, results show the interest of such a speech enhancement system for low bit rate parameter estimation and underline the interest to adapt different pre-processing techniques for each parameter estimation.

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Bibliographic reference.  Guilmin, Gwénaél / Bouquin-Jeannès, Régine Le / Gournay, Philippe (1999): "Study of the influence of noise pre-processing on the performance of a low bit rate parametric speech coder", In EUROSPEECH'99, 2367-2370.