France Telecom

André Gilloire

Wolfgang Tager

Gaël Mahe

Valérie Turbin

A technique for correcting the voice spectral deformations introduced by a communication network. Prior to the operation of equalization of the voice signal of a speaker, the constitution of classes of speakers is communicated, with one voice reference per class. Then, for a given speaker, the classification of this speaker is communicated, that is to say his allocation to a class from predefined classification criteria in order to make a voice reference which is closest to his own correspond to him. Then, for that given speaker, communicating the equalization of the digitized signal of the voice of the speaker carried out with, as a reference spectrum, the voice reference of the class to which the speaker has been allocated. This technique applies to the correction of the timbre of the voice in switched telephone networks, in ISDN networks and in mobile networks.

Method and system of correcting spectral deformations in the voice, introduced by a communication network

A device for processing digital data. A module (M, M) produces on a data vector of the frequency domain Z(k), wherein K varies from 0 to N&#x2212;1, a convolution with a function U, convolution which corresponds to a cancellation in the time domain of the samples of the inverse transform of Z(k). The function U is in the form: U(k)=sin c(k&#x2212;k/2.e)&#x2212;j&#x3c0;(&#x3b1;(k&#x2212;k/2.P(k)), wherein Kis a constant integer and P(k) a weighting window symmetrical about k.

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Lannion, France

André Gilloire