Dynamic optimization of handsfree microphone gain

H - Electricity – 04 – M

Patent

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H04M 1/60 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2263540

A system and method for dynamically optimizing the analog gain for a microphone in a telephone terminal operable in handsfree mode. The system makes use of a process whereby a relatively inexpensive analog to digital converter is used to meet gain requirements so as to accommodate the loudest echo through transmit path while maintaining an acceptable signal to noise ratio for the quietest talker. The system digital signal processor in conjunction with speech activity detection means is used to provide an optimum microphone gain under all circumstances.

Système et procédé servant à effectuer l'optimisation dynamique du gain analogique d'un micro dans un poste téléphonique pouvant être utilisé en mode mains libres. Ce système est basé sur un processus d'utilisation d'un convertisseur analogique en numérique relativement économique servant à répondre à la demande d'amplification, de manière à absorber l'écho le plus fort par l'intermédiaire d'un trajet de transmission, tout en maintenant un rapport acceptable entre signal et bruit pour l'interlocuteur parlant le plus doucement. On utilise le processeur de signaux numériques du système en combinaison avec des moyens de détection d'une activité de parole, dans le but de créer une amplification micro optimisée en toutes circonstances.

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