Full-duplex audio communication terminal

摘要

A full duplex audio communication terminal (100) comprises a noise attenuation module (4) arranged on a transmission path of the terminal. The noise attenuation module comprises two activation thresholds, which are respectively intended to be adjusted above a noise level and above an echo level of transmission signals (TC) produced by the terminal. The first or the second activation threshold is selected as a function of the detection of signals (R) received by said terminal. An improvement to the suppression in the transmission signals of echoes from received signals is thus obtained which is compatible with the principle of full duplex communication. Preferably, the noise attenuation module processes transmission signals which are produced by an echo compensator (2). Residual echo still present in the transmission signals already processed by the echo compensator is thus further reduced.

主权项

1. A communication terminal adapted to operate in a full-duplex audio communication mode, comprising:
a detector of signals received by the terminal, adapted to produce a reception detection signal indicating a presence or absence of received signals; and a noise attenuation module arranged to attenuate transmission signals produced by the terminal when a level of said transmission signals is less than an activation threshold, the noise attenuation module is additionally adapted to select a value for the activation threshold in a manner which varies according to the reception detection signal, with a first value selected when received signals are absent, which is less than a second value selected when received signals are present, the terminal additionally being adapted to determine the first and the second values selected for the activation threshold so that said first and second values are additionally and respectively greater than a noise level of the transmission signals and greater than a level of a contribution from received signals which is present in said transmission signals.