France Telecom

Deutschetelekom Ag

Orange

Vincent Barriac

Alexander Raake

Sebastian Moeller

Patrick Losquin

Nicolas Cote

Marcel Waeltermann

Jean-Yves Le Saout

Ulrich Heute

Valerie Gautier-Turbin

Kirstin Scholz

Marcel Wältermann

Valérie Gautier-Turbin

Marcel Dipl-Ing Wältermann

Sebastian Prof Dr-Ing Möller

Alexander Dr-Ing Raake

Nicolas Côté

Sebastian Möller

A method for determining a speech quality measure of an output speech signal with respect to an input speech signal, wherein the input signal passes through a signal path of a data transmission system resulting in the output signal, includes the steps of pre-processing the output signal; determining at least one of an interruption rate of the pre-processed output signal and a measure for an intensity of musical tones present in the pre-processed output signal; and determining the speech quality measure from at least one of the interruption rate and the measure for the intensity of the musical tones.

Method and system for the integral and diagnostic assessment of listening speech quality

A method for evaluating the processing delay of a speech signal contained in data packets received in a receiver terminal having a telephony module during a voice call to a terminal sending the data packets over a packet-switched network. The method includes the step of obtaining from the received data packets a stream of audio packets containing the speech signal. Within a predetermined decoding time, the stream of obtained audio packets is decoded and a first reconstituted speech signal is created. At least a portion of the speech reconstituted by the telephony module is duplicated to create a second reconstituted speech signal. The time difference between the first and the second reconstituted speech signals is determined. The processing delay of the speech signal in the receiver terminal is calculated from at least the determined time difference between the reconstituted first and second speech signals and the predetermined decoding time.

Method and devices for evaluating transmission times and for processing a voice signal received in a terminal connected to a packet network

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Trelevern, France

Vincent Barriac