Voice activity detection using echo return loss to adapt the...

G - Physics – 10 – L

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G10L 11/02 (2006.01)

Patent

CA 2212658

A voice activity detector (26) comprising an input for receiving an outgoing speech signal transmitted from a speech system (2) to a user and an input for receiving an incoming signal from the user. Both the outgoing and incoming signals are divided into time limited frames. Means (263) are provided for calculating a feature from each frame of the incoming signal and for forming a function of the calculated feature and a threshold. Based on the function, it is determined whether or not the incoming signal includes speech. Means are provided to determine the echo return loss during an outgoing speech signal from the interactive speech system and to control the threshold in dependence on the echo return loss measured.

Détecteur (26) d'activité vocale comprenant une entrée destinée à recevoir un signal vocal sortant, transmis à partir d'un système (2) vocal à destination d'un utilisateur, ainsi qu'une entrée servant à recevoir un signal entrant provenant de l'utilisateur. A la fois les signaux sortants et les signaux entrants sont divisés en trames limitées dans le temps. On a monté des moyens (263) de calcul d'une caractéristique à partir de chaque trame de signal entrant, ainsi que de formation d'une fonction de la caractéristique calculée et d'un seuil. D'après cette fonction, il y a détermination si le signal entrant comporte ou non la parole. On a également monté des moyens pour déterminer l'affaiblissement d'équilibrage d'écho, lors d'un signal vocal sortant, à partir du système de parole interactif, et pour régler le seuil en fonction de l'affaiblissement d'équilibrage d'écho mesuré.

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