Optimizing Voice-over-IP Speech Quality Using Path Diversity

Abstract — In last few years, voice over Internet protocol (VoIP) has been gaining popularity as an alternative to traditional telephone by transmitting voice signals as packets over the Internet and private IP-based networks. However, voice packets experience loss, delay, and delay variation, which requires buffer-ing, playout scheduling and loss concealment at the receiver. In this paper, we give an overview of a VoIP application and show how playout scheduling and loss concealment are jointly used to optimize perceived speech quality. We use this optimization cri-terion to design a histogram-based playout scheduling algorithm. Then, we identify the limitations of the VoIP application for this scheme and propose improvement using path diversity approach that can be implemented via a Service Overlay Network (SON). We present simulations results that show significant improvement of VoIP quality by using this approach. I

Origin of the resonant optical Kerr nonlinearity in Cd(S, Se)-doped glasses and related topics

International audienc