Sixth European Conference on Speech Communication and Technology

Budapest, Hungary
September 5-9, 1999

Backward Adaptive RBF-Based Hybrid Predictors for CELP-type Coders at Medium Bit-Rates

C. Peláez-Moreno, F. Díaz-de-María

Dpto. Tecnologías de las Comunicaciones, Universidad Carlos III de Madrid, Leganés (Madrid), Spain

Nonlinear prediction is a natural way to increase the quality of speech coders. Several approaches have been recently proposed in this direction ([1,2,3,4] are some examples) and most of them use neural networks as predictors. Nevertheless, the computational cost due to the network training is very high, since it usally involves a gradient descent-based nonlinear optimization process. In this paper we propose some improvements of our previous work reported in [3], all of them aiming at reducing the computational cost. Our predictor can be used in CELP-type coders and provides a 0.6 dB increase of the SEGSNR with respect to conventional CELP coders.

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Bibliographic reference.  Peláez-Moreno, C. / Díaz-de-María, F. (1999): "Backward adaptive RBF-based hybrid predictors for CELP-type coders at medium bit-rates", In EUROSPEECH'99, 1475-1478.