France Telecom

France Telecom Sa

Franck Bouteille

Pascal Scalart

David Deleam

Grégoire Le Tourneur

Christophe Beaugeant

The digital data packets received contain data describing successive time segments of a signal stream to be restored, for example audio. Elements obtained from the packets received are recorded in a buffer memory organized in first-in first-out mode. A burst of packets fulfilling a certain burst size condition is detected a priori, on the basis of a reception delay evaluated in response to the reception of a first packet of the burst. The content of the buffer memory is controlled by accounting for the detection of the burst fulfilling the size condition.

Method of processing data packets received on asynchronous networks, and device for implementing the method

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.

Echo canceller in a communication system at a terminal

The device receives an input signal xand an observation signal y, one component of which is the response of a system to the input signal. It determines an error signal eat an instant t in accordance with the equation e=y&#x2212;XH, where His a vector made up of L coefficients of an identification filter having a finite impulse response representative of the impulse response of the system and X=(x, x, . . . , x). A predictive analysis of the input signal is performed by a computation applied to frames of the input signal. The L coefficients of the identification filter are adapted by adding to the vector Ha vector proportional towhere Uis a vector made up of the L values of a prediction residue of the input signal at the instant t and at the preceding L&#x2212;1 instants, and &#x3bb; is a positive or zero coefficient.

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Trebeurden, France

Franck Bouteille