Conference terminal with echo reduction for a voice...

H - Electricity – 04 – M

Patent

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H04M 9/08 (2006.01)

Patent

CA 2572890

A conference terminal for a digital voice conference system comprises a first sound transducer means (56), which is implemented to generate a microphone signal from an acoustic signal, a second sound transducer means (60), which is implemented to generate an acoustic signal from a loudspeaker signal, a connecting means (64), which is implemented to enable a connection between conference terminal (50) and a conference central unit, to receive a composite conference signal from the conference central unit, and a means (52) for echo suppression, which is implemented to combine the microphone signal or a signal derived therefrom in a noise suppression means with a composite conference signal in a listening operation of the conference terminal, such that a loudspeaker signal results, in which the acoustic signal, on which the microphone signal is based, is reduced. Such a conference terminal allows the suppression of a remote own echo and a remote foreign echo, whereby digital wireless voice conference systems can be realized, which ensure high voice quality and noise immunity with minimum wiring effort.

L'invention concerne un terminal de conférence pour un système numérique de conférence, ce terminal comprenant un premier dispositif transducteur acoustique (56) conçu pour générer un signal de microphone à partir d'un signal acoustique, un deuxième dispositif transducteur acoustique (60) conçu pour générer un signal acoustique à partir d'un signal de haut-parleur, un dispositif de communication (64) conçu pour établir une liaison entre le terminal de conférence (50) et une unité centrale de conférence afin de recevoir de cette unité centrale de conférence un signal de conférence de somme, et un dispositif (52) de suppression d'écho conçu pour combiner le signal de microphone ou un signal dérivé dans un dispositif de suppression d'écho avec le signal de conférence de somme, le terminal de conférence fonctionnant en mode d'écoute, de façon à obtenir un signal de haut-parleur dans lequel le signal acoustique servant de base au signal de microphone est réduit. Un terminal de conférence de ce type permet de supprimer un écho propre éloigné et un écho étranger éloigné, d'où la possibilité de réaliser des systèmes numériques de conférence sans fil de haut niveau en termes de qualité sonore et d'insensibilité aux parasites pour un câblage minimal.

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