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Teleconference Room Design
   In Teleconferencing asa well as Videoconferencing, the acoustical environment of the room  that you use for it is critical. Any reverberation (echoing) and any HVAC or traffic noise background (ambient) will seriously undermine the success of its use. This can be frustrating, and these interference's must be cured.

  We have provided teleconference room design and remediation services on several occasions. There are usually two problems that arise when the acoustics of that space is not understood. The first is that the room selected for that service is too noisy due to HVAC noise or excess reverberation due to insufficient installed sound absorption. The ambient noise (no one talking) should not exceed NC-25 (30 dBA). The reverberation time (RT60) should not exceed 1/2 second. The second is that the microphones are located too far away from the persons that do the talking. Ideally microphones are locted less than 6" from the talker's lips

    The main challenge in teleconference space siting and design is to provide a quiet space  and with minimal reverberance. The former requires our expert knowledge of high sound transmission loss wall design against interfering exterior noises as well as our extensive expertise in HVAC quieting. The latter requires our routine measurement of vital room acoustics parameters.

    We routinely measure room background sound and RT60 ("reverberation time") in octave bands, as well as modern measures of C80 (clarity), D50 (intelligibility), EDT (early delay time) and TCT (central time). All these data provide state-of-the art design parameters that allow us to optimize your individual spaces for your appointed uses.

The quantitative values that should not be exceeded are:

1-    Reverberation time must me less that 0.6 seconds at speech frequencies (100Hz--5,000 Hz).  This is assured by having a high NRC (0.9 or more) acoustical tile ceiling and sound absorbing side wall panels.

2-    The ambient noise level should be less than NC-25 (30 dBA). This is assured by having a quiet air supply system and high STC windows; (STC30+) in high noise locations.

    Installed excesses beyond these make the room undesirable.

    Interestingly these criteria developed over two decades were then found to be equally vital and effective for  school classooms. 

See also "Classroom Acoustics".

Last updated 24-Dec-2014.
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