The article contains the results of investigations on the objective assessment of speech transmission quality, done at the Institute of Telecommunication and Acoustics of Wroclaw University of Technology. These investigations are continuation and development of previous ones. Their results were presented at OSA Conferences during the period 1996 to 2000. The system enabling objective evaluation of speech intelligibility according to the subjective measurements results for digital telecommunication channel is presented. PSQM perceptual processing module was added to the system in order to obtain the results consistent with the subjective measurements.
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