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Conversational Quality Measurement System for Mobile VoIP Speech Communication  

Cho, Jae-Man (광운대학교 전자융합공학과)
Kim, Hyoung-Gook (광운대학교 전자융합공학과)
Publication Information
The Journal of The Korea Institute of Intelligent Transport Systems / v.10, no.4, 2011 , pp. 71-77 More about this Journal
Abstract
In this paper, we propose a conversational quality measurement (CQM) system for providing the objective QoS of high quality mobile VoIP voice telecommunication. For measuring the conversational quality, the VoIP telecommunication system is implemented in two smart phones connected with VoIP. The VoIP telecommunication system consists of echo cancellation, noise reduction, speech encoding/decoding, packet generation with RTP (Real-Time Protocol), jitter buffer control and POS (Play-out Schedule) with LC (loss Concealment). The CQM system is connected to a microphone and a speaker of each smart phone. The voice signal of each speaker is recorded and used to measure CE (Conversational Efficiency), CS (Conversational Symmetry), PESQ (Perceptual Evaluation of Speech Quality) and CE-CS-PESQ correlation. We prove the CQM system by measuring CE, CS and PESQ under various SNR, delay and loss due to IP network environment.
Keywords
Mobile VoIP QoS; perceptual evaluation of speech quality; conversational efficiency; conversational symmetry;
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  • Reference
1 M. Liem, H.-G. Kim and O. Manck, "Algorithm of a single chip acoustic echo canceller using cascaded cross spectral estimation," International Workshop on Acoustic Echo and Noise Control (IWAENC 2003), pp.187-189, Sep. 2003.
2 "Perceptual evaluation of speech quality (PESQ): An objective method for end-to-end speech quality assessment of narrow-band telephone networks and speech codecs," ITU-T Recommendation P.862, Feb. 2001.
3 "Methods for subjective determination of transmission quality," ITU-T Recommendation P.800, Aug. 1996.
4 B. W. Wah and B. Sat, "Analyzing voice quality in popular VoIP applications," IEEE Multimedia archive, vol.16, no.1, pp.46-59, Mar. 2009.   DOI
5 B. W. Wah and B. Sat, "The design of VoIP system with high perceptual conversational quality," Academy publisher Journal of Multimedia, vol. 4, no. 2, pp.49-62. Apr. 2009.
6 K. sakhnov, E. Verteletskaya and B. Simak, "Approach for energy-based voice detector with adaptive scaling factor," IAENG International Journal of Computer Science, vol. 36, no. 4, Nov. 2009.