Method for executing automatic evaluation of transmission...

G - Physics – 10 – L

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G10L 19/00 (2006.01)

Patent

CA 2334906

A source signal (e.g. a voice test) is processed by a voice coder or transmitted and converted into a receive signal (coded voice signal). The source and receive signals are separately subjected to preprocessing and to psycho-acoustic modeling, followed by internal calculation to evaluate the similarity of the signals. Finally, MOS calculation is carried out to obtain a result that can be compared with human evaluation. According to the invention, a spectral similarity value is determined for evaluating transmission quality, which is based on calculating the covariance of the spectra source and receive signals and dividing the covariance by the standard deviation of the above mentioned spectra. The inventive method enables objective evaluation (voice quality forecast) while taking into account the human hearing process.

Un signal source (par exemple un échantillon vocal) est traité ou transmis par un codeur vocal (1) et transformé en un signal de réception (signal vocal codé). Le signal source et le signal de réception sont soumis séparément à un prétraitement (2) et à une modélisation psychoacoustique (3). Ces opérations sont suivies d'un calcul d'écart (4) qui évalue la similitude des signaux. Enfin, un calcul de note d'opinion moyenne (NOM) est effectué, lequel permet d'obtenir un résultat pouvant être comparé avec l'évaluation humaine. Selon l'invention, une valeur de similitude spectrale est définie pour l'évaluation de la qualité de transmission, cette valeur reposant sur un calcul de la covariance des spectres du signal source et du signal de réception et d'une division de la covariante par l'écart type des deux spectres mentionnés. Ce procédé permet une évaluation objective (prédiction de la qualité vocale) tenant compte du processus d'écoute humain.

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