France Telecom

France Telecom Sa

Orange

Grégoire Le Tourneur

David Deleam

Jean-Philippe Thomas

Pascal Scalart

Franck Bouteille

Monique Auvray

Christophe Beaugeant

A divergence detection device for an adaptive system comprising means for calculating the energy of an input signal of the system, means for calculating the energy of an output signal of the system and means for analysing the energy of the input signal and the energy of the output signal so as to detect a rise in the energy of the output signal, relative to the energy of the input signal, in case of divergence of the system.

Device and method for detecting a divergence of an adaptive system and use of such a device for the detection of a divergence of a digital filter

This device for processing audio signals for telecommunication equipment comprises automatic gain control means () acting on the level of the received audio signal (Sr) by amplifying and attenuating the signal as a function of the level of the received signal and echo cancelling means (). The automatic gain control means () comprise amplification means (-) and attenuation means (-) for separately amplifying and attenuating the received signal downstream and upstream of the echo cancelling means (), when considering the propagation direction of the received signal.

Device and method for processing audio signals and telecommunication set equipped with such a processing device

An echo processing technique for attenuating echo components of a direct signal Xin a return signal Y. A receive gain Grand a send gain Geare calculated. The receive gain Gris applied to the direct signal and an input signal Xis produced and emitted into an echo generator system. The send gain Geis applied to an output signal Yfrom the echo generator system and the return signal Yis produced. A coupling variable COR is calculated which is characteristic of the acoustic coupling between the direct signal Xor the input signal Xand the output signal Y. The receive gain Grand the send gain Geare calculated on the basis of the coupling variable.

Echo processing devices for single-channel or multichannel communication systems

A terminal in a communication system includes emitting and receiving transducers and an echo processor having an adaptive echo canceler that processes a residual echo output from the adaptive echo canceler.

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St Quay-Perros, France

Grégoire Le Tourneur