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1. (WO2001035393) NON-INTRUSIVE SPEECH-QUALITY ASSESSMENT

Pub. No.:    WO/2001/035393    International Application No.:    PCT/GB2000/004145
Publication Date: Fri May 18 01:59:59 CEST 2001 International Filing Date: Fri Oct 27 01:59:59 CEST 2000
IPC: G10L 19/00
Applicants: BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
GRAY, Philip
HOLLIER, Michael, Peter
Inventors: GRAY, Philip
HOLLIER, Michael, Peter
Title: NON-INTRUSIVE SPEECH-QUALITY ASSESSMENT
Abstract:
This invention relates to non-intrusive speech-quality assessment using vocal-tract models, in particular for testing telecommunications systems and equipment. This process requires the reduction of the speech stream under assessment into a set of parameters that are sensitive to the types of distortion to be assessed. Once parameterised, the data is used to generate a set of physiologically-based rules for error identification, using a parametric modelling of the shape of the vocal tract itself, by comparison between derived parameters and the output of models of physiologically realistic forms for the vocal tract, and the application of physical constraints on how these can change over time.