Processing speech signals

G - Physics – 10 – L

Patent

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G10L 11/04 (2006.01)

Patent

CA 2445378

A method of processing a speech signal in noise, comprising: determining a frequency spectrum of a frame of the speech signal; determining a value of the pitch of the frame of the speech signal; identifying peakes (12, 14, 16, 22, 28, 32) in the spectrum; and evaluating the peaks individually to determine respective scores for the peaks, the score for a peak being a measure of the likelihood that the peak is a harmonic band of teh speech signal. As a consequence there is: (a) no need for high f0 accuracy as there is no need to predict long sequences of harmonic positions; and (b) no need for an assumption of harmonic integrity at all points.

L'invention concerne un procédé permettant de traiter un signal vocal dans du bruit, lequel procédé consiste à déterminer un spectre de fréquences d'une trame du signal vocal; à déterminer une valeur du pas de la trame du signal vocal; à identifier des crêtes (12, 14, 16, 22, 28, 32) dans le spectre; puis à évaluer les crêtes individuellement afin de déterminer des scores respectifs pour les crêtes, le score d'une crête représentant une mesure de la probabilité que la crête est une bande harmonique du signal vocal. Ainsi, (a) on n'a pas besoin d'une précision f¿0? élevée, la prédiction de séquences longues de positions harmoniques n'étant pas nécessaire; et (b) on n'a pas besoin d'accepter une intégrité harmonique en tous points.

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