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http://dx.doi.org/10.12815/kits.2012.11.3.048

VoIP Receiver Structure for Enhancing Speech Quality Based on Telematics  

Kim, Hyoung-Gook (광운대학교 전파공학과)
Seo, Kwang-Duk (광운대학교 전파공학과)
Publication Information
The Journal of The Korea Institute of Intelligent Transport Systems / v.11, no.3, 2012 , pp. 48-54 More about this Journal
Abstract
The quality of real-time voice communication over Internet Protocol networks based on telematics is affected by network impairments such as delays, jitters, and packet loss. To resolve this issue, this paper proposes a receiver-based enhancing method of VoIP speech quality. The proposed method enables users to deliver high-quality voice using playout control and signal reconstruction, which consists of concealment of lost packets, adaptive playout-buffer scheduling using active jitter estimation, and smooth interpolation between two signals in a transition region. The proposed algorithm achieves higher Perceptual Evaluation of Speech Quality (PESQ) values and low buffering delay than the reference algorithm.
Keywords
Voice over Internet Protocol; Playout Control; Loss Concealment;
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