Accelerated convolution noise elimination

Details Accelerated convolution noise elimination Accelerated convolution noise elimination

G - Physics

10

L

G10L 21/02 (2006.01) G10L 15/20 (2006.01)

Patent

CA 2278231

A method and apparatus for removing convolution noise from a signal such as one carrying speech information. The signal is transformed into a log-spectral domain where a smoothed model is fitted to the log-spectrum subject to constraints of concavity and an overall bandpass shape. The smoothed model has quadratic segments of negative curvature and linear segments, the segments being smoothly joined at breakpoints. The model, which may be recursively updated, is substracted from each log-spectral data vector.

L'invention concerne un procédé et un appareil pour éliminer le bruit de convolution d'un signal tel qu'un signal portant des informations vocales. Le signal est transformé en un domaine spectral logarithmique où un modèle lissé est adapté au spectre logarithmique sous réserve des contraintes de concavité et d'une forme de bande passante totale. Ce modèle lissé présente des segments quadratiques de courbure négative et des segments linéaires, les segments étant réunis de manière lissée au niveau des points de rupture. Ce modèle, qui peut faire l'objet d'une actualisation récurrente, est soustrait de chaque vecteur de données spectrales logarithmiques.

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