Wideband speakerphone

Details Wideband speakerphone Wideband speakerphone

H - Electricity

04

M

H04M 1/20 (2006.01) H04B 3/23 (2006.01) H04M 1/60 (2006.01)

Patent

CA 2737961

Processing requirements for acoustic echo cancellation in voice communications are significant and are even more so as the bandwidth of the communication increases. Whilst voice communication occupies a relatively narrow band of frequencies the processing requirements and so forth for wideband communication render acoustic echo cancellation difficult to achieve in a cost effective manner. The invention provides for acoustic echo cancellation within wideband communications by dividing the communications into sub-bands and applying acoustic echo cancellation to some sub-bands whilst processing other sub-bands according to the status of the communications. Additional sub-bands are transmitted at either full-duplex or half-duplex.

Les exigences de traitement pour une annulation d'écho acoustique dans des communications vocales sont importantes et le sont d'autant plus que la largeur de bande de la communication augmente. Tandis qu'une communication vocale occupe une bande de fréquences relativement étroite, les exigences de traitement et ainsi de suite pour une communication large bande rendent l'annulation d'écho acoustique difficile à réaliser d'une manière rentable. A cet effet, l'invention porte sur une annulation d'écho acoustique dans des communications large bande par division des communications en sous-bandes et application d'une annulation d'écho acoustique à certaines sous-bandes simultanément au traitement d'autres sous-bandes selon l'état des communications. Des sous-bandes supplémentaires sont transmises soit en bidirectionnel simultané soit en bidirectionnel à l'alternat.

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