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Virtual Audio Chat User Interaction and Audio Quality Evaluation Abstract
Virtual Audio Chat: User Interaction and Audio Quality Evaluation
Lea Skorin-Kapov* and Saška Mateša**
*Ericsson Nikola Tesla
Krapinska 45, 10000 Zagreb, Croatia
**Zagrebačka Banka
Paromlinska 2, 10000 Zagreb, Croatia
e-mail: lea.skorin-kapov@etk.ericsson.se, saska.matesa@zaba.hr
Abstract
Virtual Audio Chat is an interactive Virtual Reality (VR)/Web application that enables real-time
audio streaming between multiple Internet users. Users join the audio chat using a VR interface designed
as a Virtual Reality Modeling Language (VRML) model of a mobile phone. Various interactions
implemented using VRML allow users to choose the color/textures applied to the mobile phone and the
audio codec used during the audio streaming session.
In this paper we address the developed application in terms of user interactions with the VR
interface and evaluation of audio quality. Our primary focus is to evaluate and compare audio quality for
different audio coders. Overall speech quality and network requirements depend in great deal on the type
of codec being implemented. Different coders result in different data rates and Mean Opinion Scores
(MOS) relating to subjective quality. We performed measurements of network throughput and subjective
speech quality for three different coders: PCM, GSM, and G.723.1. Two sets of measurements were
performed: the first set using previously recorded speech and music, and the second set during a live chat
between two participants. Results have been analyzed and the coders have been compared in terms of
network throughput
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