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Designing Audio Conferencing
Systems
Reprinted from the BICSI AV Design Reference Manual, the following audio
conferencing design material is authored by Craig H. Richardson, copyright 2006.
The goal of audio conferencing is to enable two geographically separated
groups of people, referred to as the local and remote talkers respectively, to
communicate as if they are in the same room together with fast interation and
allowing both parties to speak and be heard at the same time.
The following figure shows a typical solution for audio conferencing (or audio
for video conferencing) that consists of local microphones and loudspeakers,
an acoustic echo canceller and noise canceller, automatic microphone mixers,
matrix mixers, telephony interfaces, video codecs and possibly some program
audio (such as CD's, DVD's, or video tapes). The rest of this chapter will
explore the different aspects of the following figure in more detail. This type
of configuration would be installed in each of the rooms that are conferenced
together.
Matrix
NC
Auto
Mixer
NC
NC
Program Audio
Source 1
Program Audio
Source 2
Recorder
Video Codec
AMP
Telephone
Interface
AEC
AEC
AEC