bgutili conference room


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Activity

A conference room isimportant in terms of

communication, both internally

and externally. The design of

the conference room can

effectively communicate thecompany's values. A

conference room hosts

meetings where everyone

around the table must be able

to hear and be heard, making

speech clarity a crucial

element. Good sound

insulation is also necessary in

order to achieve privacy.


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A conference room is designedfor two acoustic purposes

Confine sound within the walls so peopleon the outside cannot hear what is said

inside.

Create a good environment forconversations, both those made withinand those made through a

speakerphone or similar.


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Acoustics in Conferencerooms

When designing a room for speech it is importantto give consideration to how the room will sound at

the early design stage on order to optimize speechintelligibility.

The acoustic design should give consideration tothe following factor:

Indoor ambient noise levels/ sound isolation Reverberation time and hence, room size and

acoustic absorption required.

Room geometry reflections

HVAC System


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INDOOR AMBIENT NOISE LEVELS

This is one of the most critical elements inroom design as the speakers voice needs to beclearly heard above the background noise. Thiswill assist with speech intelligibility but alsoprevent undue strain to the speaker and will

minimize distraction. Background noise cancome from a number of sources:

External traffic, planes and trains etc. entering

via external walls and windows.

Noise from circulation corridors, foyers, toilets

within the same or adjacent development.

Air conditioning and mechanical plant serving

the room.


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Sound Isolation

Sound isolation means exactly what the termimpliesthat the room needs to be acousticallyisolated from outside noise, and that it needs tostop private conversations from being heard

outside the room. It is important that soundgenerated from outside the Conference Roomnot be transmitted into the room. External soundscan come from any direction, so floors, walls andceilings all play a major role in isolating the room

from sound disturbances. Generally speaking, thehigher the Sound Transmission Class (STC) rating ofa surface, the better that surface is for isolatingexternal sounds.


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Sound Isolation

Initially, the designer should review at the site

layout. If possible, position the room away

from busy roads or other noisy areas. Forinstance, allow for a circulation corridor or

storeroom between the lecture room and

another noisy space like a canteen.

Appropriate placement on architectural

plans during the design phase can provide asignificant saving in noise control treatment

during construction.


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REVERBERATION TIME

Speech intelligibility is also a function of theReverberation Time (RT). RT is a parameter thatobjectively describes the echoic quality of a room.

This means that the walls should be thick and rigidnot letting much sound through and thus the sound

is trapped inside in the form of echoes orreverberations. These echoes pollute the acousticenvironment on the inside and must therefore beeliminatedsomething which is best done by soundabsorption. Since the conversation that createdthese echoes consists of both high and lowfrequencies then the echoes also consists of bothhigh and low frequencies. Because of this both highand low frequencies alike need to be removed, orabsorbed, and preferably equally much of each.


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Room Geometry The shape of the room, the location of its surfaces

and whether these surfaces are absorptive orreflective, all determine the loudness of thespeech signal and contribute to its intelligibility.

As the room size increases, the greater thereliance on the room geometry to provide anappropriate environment. Communication isfurther compromised if the boardroom is

excessively reverberant, impacting not onlycommunication within the room but also thesound quality at the other end of ateleconference or video conference.


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Sound Reflection

1. Direct sound; reflections by: 2. ceiling; 3.

walls; 4. floors; 5. smooth surfaces (windows)


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HVAC Systems

Heating, ventilation and air conditioning systemsare often a source of undesirable sound in aConference Room. A designer should payattention to a few basic rules:

1. Mechanical equipment, VAV boxes and fancoilunits should not be located above,

below or adjacent to a Conference Room.2. Use air handlers with low soundlevel ratings.3. Size air ducts large enough to permit low air

velocities. Diffusers should have a NCrating of 25 or less.

4. Use sound

absorbing duct liner. This will reduce theinside area of the duct, so upsize the ductaccordingly to compensate.


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THANK YOU!

bgutili conference room

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