ISSN : 1796-2048
Volume : 1    Issue : 6    Date : September 2006

Speech Quality Measurement Methods with Applying PLC Algorithms on Real-time Transmission
Control Scheme for VoIP Service
Jinsul Kim, Hyun-Woo Lee, Won Ryu, Byung Sun Lee, Seung Ho Han and Minsoo Hahn
Page(s): 46-53
Full Text:
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According to the discovery of available and suitable audiovisual services over IP, researches on the
Quality of Service (QoS) for various multimedia application services are required. This paper
presents evaluation of speech quality applying improved Packet Loss Concealment (PLC)
algorithms with an end-to-end bidirectional transmission control scheme. We propose real-time
transmission control scheme to perform better quality monitoring of VoIP service. In order to
evaluate the newly proposed RTCP-XR scheme for VoIP services, we measure in real-time the
quality degree of the received speech signal while applying our improved Packet Loss Concealment
(PLC) algorithms in G.711 and G.729A codecs using an implemented Session Initiation Protocol
(SIP)- based SoftPhone and a 1-port gateway systems. Overall, for the evaluation with scientific
exactitude of speech quality applied our PLC algorithms we examine with made phone-calls
through the heterogeneous network systems. The experimental results confirm the applied PLC
algorithms for improvement of speech quality over IP in real environments with the QoSfactor
transmission control mechanism.

Index Terms
VoIP, QoS, Speech Quality, RTCP-XR, PLC, PESQ, E-Model, SIP, BcN services