Room and Electro-Acoustical Conditions in Video Conferencing Rooms
Doctoral thesis
Permanent lenke
http://hdl.handle.net/11250/278471Utgivelsesdato
2014Metadata
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Sammendrag
Video conferencing (VC) has gained popularity due to the huge progress in the field of
telecommunications and networking, leading to better audio and video signal quality, besides its major
advantages in saving travel time and cost leading to better environment. Current research trends in VC
include studies of how to increase the Quality of Experience (QoE), i.e. the quality of transmitted,
coded, and received audio and video signals from one end to another. The QoE depends on many factors
such as the quality of the sending and receiving equipment (Microphones, cameras, loudspeakers), the
audio/video coders, the network conditions, etc. However an often overlooked factor is the room
acoustical conditions. Poor room acoustical conditions can easily ruin the perceived audio quality even
if high quality equipment is used.
Room acoustical conditions can be predicted by accurate computer programs and simulations, which
require much detailed input data and complex computations, or by simple predictions models, which
are less accurate but require much less input data. Such simple models are very useful since they can
directly illustrate and explain the relations of a few main system parameters. These predictions models
exist since a long time ago for single rooms but VC involves two rooms, which makes these classical
predictions models not valid for studying VC.
The scope of the research in this thesis is how to predict room acoustical parameters using such simple
but efficient models that can facilitate parametric studies of the total audio transmission in a VC
scenario.