Technique for reducing echoes in conference communications

Details Technique for reducing echoes in conference communications Technique for reducing echoes in conference communications

H - Electricity

04

B

H04B 3/20 (2006.01) H04M 3/00 (2006.01) H04M 3/56 (2006.01) H04M 3/40 (2006.01)

Patent

CA 2102857

Distortion and instability due to echoes in conference communications is reduced through the use of an echo canceller disposed in a conference bridging circuit. This circuit includes a signal combiner which receives information signals from each of the parties in the conference communications and provides an outputsignal which is a combination of the received information signals and an echo compensation signal. The echo canceller provides this echo compensation signal in response to the combiner output signal. Advantageously, the echo canceller can be fixed or adaptive. In the latter case, the adaptation can be in response to the received information signals or to training sequences.

L'invention est un éliminateur d'échos pour circuit de pontage conférentiel qui réduit la distorsion et l'instabilité dans les communications de conférence. Ce circuit de pontage comprend un combinateur de signaux qui reçoit des signaux d'information de chacun des participants à la conférence et produit un signal qui est une combinaison de ces signaux d'information et d'un signal de correction des effets dus aux échos. L'éliminateur d'échos de l'invention produit ce signal de correction en réponse au signal de sortie du combinateur. Fort heureusement, l'éliminateur d'échos peut être fixe ou adaptatif. Dans ce dernier cas, l'adaptation peut se faire en réponse aux signaux d'information reçus ou aux séquences d'apprentissage.

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