These also can cause undo strain on the video compression system. Acoustics Audio quality, as opposed to video quality, is one of the most important contributing factors to a favorable videoconference experience, therefore good acoustics are paramount. One item of particular concern is reverberation - the effect of sound reflecting off of hard surfaces. One of the best ways to minimize the deleterious effects of reverberation is to coat floors, ceilings, and walls with sound absorbing material. In addition to minimizing reverberation it is also important to isolate the room from external noise sources such as fans and duct work from heating and cooling systems, water pipes, office machines, telephones, and street noise.
Microphone placement is also an important factor influencing audio quality.
The first microphone needs to be installed so that it is at least six feet from the system speakers. The second microphone is placed ten feet from the first. A microphone cannot be farther than seven feet from a speaking participant to ensure maximum audio quality and no more than three microphones can be used in a room. The table cannot be wider than 12 feet or longer than 24 feet in order to accommodate the requirements of the microphones and audio-tracking cameras. There cannot be more than 25 feet from the lens of the camera to the farthest participant to ensure visibility and correct functioning of audio-tracking systems.