Acoustic source range detection system

G - Physics – 01 – S

Patent

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Details

G01S 11/14 (2006.01) G10L 11/00 (2006.01) G10L 15/00 (2006.01)

Patent

CA 2390287

The invention includes a method, apparatus, and computer program to determine whether a sound source is situated near or far from a pair of microphones situated within a reverberant space. A signal detector is applied to the data; only the data that passes the signal detector is processed any further. The signal at the two microphones is compared to obtain the angular distribution of acoustic power. The concentration of acoustic power in the direct path versus reverberant paths is determined and used to compute a direct-to-reverberant ratio. If this ratio is greater than a selected threshold, the sound source is determined to be near the microphones. Otherwise, the sound source is determined to be far from the microphones.

L'invention concerne un procédé, un appareil et un programme informatique permettant de déterminer si une source sonore se situe près ou loin d'une paire de microphones situés dans un espace réverbérant. Un détecteur de signaux est appliqué aux données; seules les données qui passent le détecteur de signaux continuent d'être traitées. Le signal au niveau des deux microphones est comparé afin d'obtenir la distribution angulaire de la puissance acoustique. La concentration de la puissance acoustique dans la voie directe par opposition à la voie réverbérante est déterminée et utilisée afin de calculer un ratio voie directe-voie réverbérante. Si ce ratio est supérieur à un seuil choisi, cela signifie que la source sonore se trouve près des microphones. Dans le cas contraire, la source se trouve loin des microphones.

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