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This paper investigates the performance of CELP speech codecs over different languages. The English language has had a dominating influence in the advance of telecommunications. With many of the major developments coming from primarily English speaking areas there is the risk that these advances may not be linguistically robust. It is noted that quality of a speech produced by voice codecs mainly...
Speech transcoding (coder tandeming) is unavoidable source of transmission quality degradation for ad-hoc or permanently interoperating networks. Test methodology and results of voice transmission quality measurement for transcoded voice in coder tandem arrangement is described. The objective tests have been performed using ITU-T P.862 (PESQ) and P.563 (3SQM) algorithms. The subjective tests results...
The main requirement in the Voice over IP technology is a good quality of received voice signal during communication between subscribers. The signal quality can be influenced by many factors such as packet loss, jitter, packet delay, noise etc. and it can be measured by number of methods. The main purpose of this paper is the investigation of an impact of different noise types and different noise...
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