Thales

Matra Nortel Communications

François Capman

Philip Lockwood

Cédric Le Barz

Erwann Renan

Sandra Marcello

Jean Martinelli

Bertrand Ravera

Edouard Hinard

Stéphane Lubiarz

Marc Padellini

Cédric Richard

Félix Mathieu

Shaheen Acheche

Frédéric Dufaux

Marc Decombas

Régis Lengelle

Sébastien Lecomte

Gaëtan Delorme-Guillon

A method and interactive system for the on-line transmission of a high-resolution video sequence composed of a succession of T images includes a step of selecting relevant images comprising at least the following steps: split each image to be transmitted at the instant t into a number N of zones, for each zone n determined in the previous step, calculate a value representative of the content of said zone, for each image to be transmitted, generate a vector representative of the content of said image containing the values obtained in the previous step, calculate a normalized coefficient of correlation &#x3b1; between the reference vector determined for a previously selected image and that calculated for the current image, make a decision on the selection (or not) of the current image as a function of the value of the normalized correlation coefficient &#x3b1;.

Interactive system and method for transmitting key images selected from a video stream over a low bandwidth network

System and process for audio authentication of an individual or speaker including a processor for decomposing an audio signal received at the sensor into vectors representative of the speaker to be authenticated for transforming the super-vector V of the speaker resulting from the concatenation of the vectors associated with the said speaker into binary data 1001100 . . . 0 taking as an input the mean super-vector M resulting from the mean super-vector, and comparing the super-vector V of the speaker with the mean super-vector M, the said binary data thus obtained being transmitted to a module for extracting the speaker authentication taking as an input the public keys Kpub(l) in order to authenticate the speaker and/or to generate a cryptographic key associated with the speaker.

Method and system to authenticate a user and/or generate cryptographic data

A method for the selection of synthesis units of a piece of information that can be decomposed into synthesis units, comprises at least the following steps for a considered information segment: determining the mean fundamental frequency value F0 for the information segment considered; selecting a sub-set of synthesis units defined as being the sub-set whose mean pitch values are the closest to the pitch value F0; applying one or more proximity criteria to the selected synthesis units to determine a synthesis unit representing the information segment.

Method for the selection of synthesis units

A method of coding and decoding speech for voice communications using a vocoder with very low bit rate includes an analysis part for the coding and the transmission of the parameters of the speech signal and a synthesis part for the reception and the decoding of the parameters transmitted and the reconstruction of the speech signal. The method comprises: grouping together the voicing parameters, pitch, gains, LSF coefficients over N consecutive frames to form a superframe, and performing a vector quantization of the voicing information in the course of each superframe by formulating a classification using the information on the chaining in terms of voicing existing over 2 consecutive elementary frames.

Method for quantifying an ultra low-rate speech coder

The invention concerns a method for detecting voice activity in a digital speech signal, in at least a frequency band, for example by means of a detecting automaton whereof the status is controlled on the basis of an energy analysis of the signal. The control of said automaton, or more generally the determination of voice activity, comprises a comparison, in the frequency band, of two different versions of the speech signal one of which at least is a noise-corrected version.

Method and device for detecting voice activity

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Versailles, France

François Capman