BibTeX
@MISC{Parhizkar09spatialerror,
author = {Reza Parhizkar},
title = {Spatial error concealment . . .},
year = {2009}
}
Share
 |
 |
 |
 |
||
OpenURL
Abstract
In this work we consider an ad-hoc audio conferensing system based on VoIP services in which the participants connect to the conference using mobile communication devices with wireless connectivity. To overcome possible quality problems in the wireless link in this configuration, we propose improvements to the existing conferencing systems. Some networking modifications are suggested to increase the channel capacity and robustness from the conference server to multiple clients. On the other hand, for the improvement of the uplink quality, we suggest a new spatial error concealment method, where a backup device captures and sends the audio signals to the server together with the primary device. In the server the lost frames from the primary channel are estimated based on the backup signal. Several methods for estimating the primary signal based on the backup signal are studied. The results of the methods are evaluated by a psychoacoustic error metric based on Zwicker’s loudness model. An informal subjective
Keyphrases
ecole polytechnique rale lausanne supervisor backup signal new spatial error concealment method backup device capture informal subjective possible quality problem ad-hoc audio primary device audio signal primary signal uplink quality wireless connectivity psychoacoustic error mobile communication device primary channel conference server wireless link multiple client voip service networking modification channel capacity several method zwicker loudness model
