Method for quantifying an ultra low-rate speech encoder

Details Method for quantifying an ultra low-rate speech encoder Method for quantifying an ultra low-rate speech encoder

G - Physics

10

L

G10L 19/08 (2006.01)

Patent

CA 2567162

The inventive method for speech encoding and decoding for voice communications uses an ultra-low rate vocoder comprising an analysing section for encoding and transmitting speech signal parameters such as vocalising information by a subband, pitch, gains, LSF special parameters and a synthesis section for receiving and decoding transmitted parameters and reconstructing the speech signal. Said method consists in assembling vocalisation parameters, pitch, gains, LSF coefficients on N consecutive frames for forming a super frame, in carrying out a vector quantification of vocalising information during each super frame by producing a classification using information chain in vocalisation terms existing on two elementary consecutive frames, wherein said vocalising information makes it possible to identify classes of sounds to which assigned rate and associated dictionaries are optimisable and in encoding the pitch, gains and the LSF coefficients by using the previously obtained classification.

Procédé de codage et de décodage de la parole pour les communications vocales utilisant un vocodeur à très bas débit comportant une partie analyse pour le codage et la transmission des paramètres du signal de parole, tels que l'information de voisement par sous-bande, le pitch, les gains, les paramètres spectraux LSF et une partie synthèse pour la réception et le décodage des paramètres transmis et la reconstruction du signal de parole comportant au moins les étapes suivantes : regrouper les paramètres voisement, pitch, gains, coefficients LSF sur N trames consécutives pour former une super-trame, effectuer une quantification vectorielle de l'information de voisement au cours de chaque super-trame en élaborant une classification utilisant les informations sur l'enchaînement en termes de voisement existant sur 2 trames élémentaires consécutives, l'information de voisement permet en effet d'identifier des classes de sons pour lesquels l'allocation du débit et les dictionnaires associés seront optimisés, coder le pitch, les gains et les coefficients LSF en utilisant la classification obtenue précédemment.

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