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This paper deals with problems of speech transmission quality measurement in TCP/IP networks. It focuses on problems caused by the inaccuracy of current methods for measuring the quality degradation caused by packet loss and jitter. The proposed solution is to use longer samples for listening tests. This article compares three evaluation methods for listening tests.
The main goal of this experiment is to evaluate performance of ITU-T P.863 POLQA in case of low-bitrate coders, namely MELPe, and Chinese language. Performance of POLQA is compared to its predecessor ITU-T P.862 PESQ.
This paper deals with analysis of relation between packet delay variations (jitter), length of jitter buffer and final voice transmission quality. For adjusting of IP channel network emulator NISTNet is used. For adjusting of buffer length VoIP client Linphone is used. Criterion of transmission quality is a MOS parameter investigated with an algorithms ITU-T P.862 PESQ and P.863 POLQA.
The paper presents new results of speech transmission quality measurements obtained by a recently developed algorithm POLQA — ITU-T P.863 [1]. Even though the algorithm is declared by its authors as not intended for coding technologies under 4kbit/s, our research shows acceptable accuracy for databases containing significant portion of low bit-rate coded samples, namely by MELPe 2.4 kbit/s. The POLQA...
This paper describes the design and verification of algorithm for voice transmission quality measurements in the environment of non-native listeners; it means the communication language differs from the mother tongue of the expected communication service user. The algorithm is based on existing ITU-T P.862 (PESQ) enhanced by newly developed non-nativity emulation block. The calculations in this block...
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