Conference calling system and method for a wireless...

H - Electricity – 04 – M

Patent

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H04M 3/56 (2006.01) H04Q 7/22 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2265757

A conference calling system for a wireless communications channel. The system is adapted for use with a channel having first, second and third participants communicating via first (34), second (20) and third (20) transmitters and receivers respectively. The system includes a circuit for receiving an encoded signal (144) from at least one of the transmitters. A second circuit determines (62) which of the participants is speaking from the received encoded signal. A third circuit is provided for re-transmitting (66) an encoded signal received from the speaking participant to the other participants. In the illustrated implementation, the encoded signals are variable rate speech vocoded signals in which speech is vocoded at full rate, silence is vocoded at 1/8th rate and the 1/2 and 1/4 rates are used as transitional rates. In the illustrative implementation, the speaker's signal is identified by examining the rate of the receiving vocoded signals. When the speaker's vocoded signal is identified, it is re-transmitted without de- vocoding to the non-speaking participants in the conference call. By re- transmitting the speaker's signal without de-vocoding, the quality of the received signal is preserved.

Système de conférence téléphonique pour une voie de transmission sans fil. Ledit système est conçu pour être utilisé avec une voie comprenant un premier, un deuxième et un troisième participant communiquant respectivement par l'intermédiaire de premiers (34), de deuxièmes (20) et de troisièmes (20) émetteurs et récepteurs. Le système comprend un circuit servant à recevoir un signal codé (144) provenant d'au moins un des émetteurs. Un deuxième circuit détermine (62) lequel des participants est le locuteur à partir du signal codé reçu. Un troisième circuit sert à retransmettre (66) un signal codé reçu à partir du locuteur et destiné aux autres participants. Dans le schéma, les signaux codés sont des signaux vocaux sous forme codée à débit variable dans lequel la parole est codée au débit maximum, le silence est codé à 1/8 du débit et les 1/2 et 1/4 de débits sont utilisés comme débits de transition. Le signal du locuteur est identifié par un examen du débit des signaux codés reçus. Lorsque le signal codé du locuteur est identifié, il est retransmis sans décodage vers les participants de la conférence téléphonique qui ne sont pas non locuteurs. La retransmission sans décodage du signal du locuteur permet de préserver la qualité du signal reçu.

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