Method and apparatus for removing noise from speech signals

G - Physics – 10 – L

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G10L 21/02 (2006.01) G10L 11/02 (2006.01) G10L 19/02 (2006.01)

Patent

CA 2416926

A method and system are provided for acoustic noise removal from human speech, wherein noise is removed without respect to noise type, amplitude, or orientation. The system includes microphones and a voice activity detection (VAD) data stream coupled among a processor. The microphones receive acoustic signals and the VAD produces a signal including a binary one when speech (voiced and unvoiced) is occurring and a binary zero in the absence of speech. The processor includes denoising algorithms that generate transfer functions. The transfer functions include a transfer function generated in response to a determination that voicing information is absent from the received acoustic signal during a specified time period. The transfer functions also include transfer functions generated in response to a determination that voicing information is present in the acoustic signal during a specified time period. At least one denoised acoustic data stream is generated using the transfer functions.

La présente invention concerne un procédé et un système de suppression du bruit acoustique dans la voix humaine, quel que soit le type, l'amplitude ou l'orientation du bruit. Le système comporte des microphones et un train de données de détection d'activité vocale couplé à un processeur. Les microphones reçoivent les signaux acoustiques, le détecteur d'activité vocale produisant un signal incluant un UN binaire lorsqu'il y a une modulation vocale (voisée ou non voisée) et un ZÉRO binaire en l'absence de modulation vocale. Le processeur met en oeuvre des algorithmes de débruitage générant des fonctions de transfert. Ces fonctions de transfert interviennent essentiellement en confirmation que l'information de voisage est absente des signaux acoustiques reçus pendant la période de temps définie. Ces fonctions de transfert interviennent également en confirmation que l'information de voisage est présente dans le signal acoustique pendant une période de temps définie. Les fonctions de transfert aboutissent à la production d'au moins un train de données acoustiques débruitées.

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