France Telecom

France Telecom Sa

Orange

Jean-Philippe Thomas

Marc Emerit

Monique Auvray

Georges Buchner

Yannick Mahieux

David Deleam

Grégory Pallone

Grégoire Le Tourneur

Alain Saliou

Alain Leyreloup

Olivier Durand

A method for switching from a first communication interface to a second communication interface on a terminal in the process of communication. This method includes the following steps: detecting a number of commands to implement a process of replacing missing samples while audio of the communication is being decoded; and switching to a second communication interface when the number of commands exceeds a threshold. Also disclosed are a device and communication terminal implementing the method as described.

Switchover from a first communication interface to a second in order to improve the perceived quality of the communication

A conference bridge of a conference system having a plurality of conference stations, the bridge comprising: reception means for receiving dual-channel audio signals coming from the conference station; determination means for determining at least one processing function per conference station of the conference system; application means for applying respective weighing functions to the received dual-channel signals; build-up means for building up one hybrid dual-channel signal for forwarding per conference station by means for summing a portion of the process dual-channel audio signals; and forwarding means for forwarding the respective hybrid dual-channel audio signal to each of the various conference stations of the conference system. A method of forwarding a spatialized audio scene and implemented by a conference bridge is also disclosed.

Forwarding an audio signal in an immersive audio conference system

The invention relates to processing signal for improving a sound pick-up in telephone and/or videophone units. The inventive method consists in comparing () a signal transmitted by a unit microphone (Mic) with a threshold low value (THR_LOW) and in amplifying () said microphone-transmitted signal when it is less than the threshold low value. However, said steps depend on the test () carried out on a signal used for feeding the loud speaker (HP), in particular consisting in controlling said last signal (crete_HP) of a background noise order (BDF) in such a way that the background noise is not amplified by an acoustical coupling between the microphone (Mic) and the loud speaker (HP).

Sound pick-up method and device, in particular for handsfree telephone terminals

A method of comparison between pieces of information characterizing reference values and pieces of information characterizing current values of sound-reproducing systems of a system of (n) microphones mand (p) speakers hpfor the control of said sound-reproducing systems characterized in that: A: for each speaker hp, at least one sound signal S is sent on the speaker hp, for each microphone m, a piece of information hpmis retrieved, this piece of information characterizing the sound-reproducing system comprising the speaker hpand the microphone m, B: a reference matrix Qis saved, this reference matrix being constituted by all the pieces of reference information hpmobtained following the sending of the sound signal S, C: as soon as a comparison is to be made, the step A is run with a sound signal S' to obtain current information on a matrix Q, D: the matrices Q and Qare compared.

Method and device for comparing signals to control transducers and transducer control system

The invention concerns a method and device for processing echo between at least two communication devices in order to attenuate, in a picked-up signal of a communication device comprising at least one microphone, the components of the signal broadcasted by at least one other communication device comprising at least one loudspeaker, characterised in that the echo processing device comprises:

Echo processing method and 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

An audio-visual system is provided for bringing together a local scene and a remote scene. The audio-visual system includes several concatenated audio-visual modules, and feedback control and control means between the various modules. Each audio-visual module comprises an image sensing device and a sound pickup device of the local scene, and an image and sound recovery device of the remote scene in an image plane. The audio-visual modules are connected to a transmission network. The feedback control and control means ensures image and sound quality continuity on the image plane when the people being filmed or recorded pass in front of the various image and sound pickup devices of the scene concerned.

Modular audio-visual system to bring together a local scene and a remote scene

In order to reduce acoustic echo and restore stereophonic sound in a digital transmission system of sound signals on multiple transmission channels, between a local site and one or several remote sites, comprising several microphones and loudspeakers, the method consists in the following steps: computing a weighting factor to be applied to each microphone signal before emitting, based on two attenuation factors computed from the microphone and loudspeaker signals; transmitting on each transmission channel the linear combination of weighted microphone signals; computing a weighting factor to be applied to each loudspeaker signal; and emitting on the loudspeaker the linear combination of transmitted, weighted signals.

Growing community of inventors

Trevou Treguignec, France

Jean-Philippe Thomas