Method and apparatus for objective speech quality...

H - Electricity – 04 – B

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H04B 17/00 (2006.01) G10L 19/00 (2006.01) H04B 1/66 (2006.01) H04M 1/24 (2006.01) H04M 3/22 (2006.01)

Patent

CA 2137005

A telecommunications testing apparatus comprising a signal generator (7) which generates a speech-like synthetic signal, which is supplied to the input of a telecommunication apparatus (1) to be tested. The distorted output of the telecommunications apparatus (1) is supplied to an analysis means (8), which derives, for both the undistorted test signal and the distorted signal from the telecommunications apparatus (1), a measure of the excitation of the human auditory system generated by both signals, taking into account both spectral masking and temporal masking phenomena. The difference between the two excitations is then calculated, and a measure of the loudness of the difference is derived which is found to indicate to a high degree of accuracy the human subjective response to the distortion introduced by the telecommunications system.

L'appareil de test d'appareils de télécommunication selon l'invention se compose d'un générateur de signaux (7) qui produit un signal synthétique quasi-vocal qui est envoyé à l'entrée d'un appareil de télécommunication (1) à tester. La sortie déformée de l'appareil de télécommunication (1) est envoyée à un moyen d'analyse (8) qui déduit, pour le signal test non déformé et le signal déformé en provenance de l'appareil de télécommunication (1), une évaluation de l'excitation du système auditif humain produite par les deux signaux, en tenant compte des phénomènes de masquage spectral et temporel. La différence entre les excitations est ensuite calculée, et l'intensité sonore qui indique avec une grande précision la réponse humaine subjective à la distorsion provoquée par le système de télécommunication est dérivée.

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