Method of and apparatus for echo reduction in a hands-free...

Details Method of and apparatus for echo reduction in a hands-free... Method of and apparatus for echo reduction in a hands-free...

H - Electricity

04

M

H04M 1/20 (2006.01) H04M 9/08 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2210313

A method and apparatus for reducing the echo in a hands-free digital cellular communication system are presented. Acting upon speech signals being presented in the downlink, uplink speech frames generated by the hands-free communication device are attenuated to prevent the downlink speech signals from being transmitted at full volume back on the uplink as an echo. Added to the attenuated uplink speech frame is a noise frame generated by the hands-free communication device, which provides a consistent level of background noise to the person at the other end of the call. The noise codeword is further randomly ordered to prevent any modulative effects from the process.

La présente invention concerne un procédé et un appareil permettant l'atténuation de l'écho dans un système numérique de radiocommunication cellulaire à mains libres. Lorsque des signaux de parole sont présents dans la transmission descendante, les trames de signaux de parole que génère le dispositif de communication à mains libres sont atténuées de sorte que les signaux de parole descendants ne soient pas retransmis comme écho dans le sens montant à pleine puissance. On ajoute à la trame de signaux de parole ascendante atténuée une trame de bruit créée par le dispositif de communication à mains libres, ce qui assure un niveau cohérent de bruit de fond au correspondant de l'appel. Le mot de code représentant le bruit est en outre ordonné de manière aléatoire pour éviter que ce processus ne crée un quelconque effet modulateur.

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