|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.
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:
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.
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
Last updated 24-Dec-2014.
Web Site by Point & Click