26 Acoustical Absorption

acoustical absorption

Acoustical absorption is used in a wide array of settings and applications.  It is used to control echo, reduce the noise level in a space, make it easier to understand speach, and control focusing.  We now offer a Free Room Acoustics Analysis (noiseexpert.com/free-room-analysis/).  Just enter your project informaton and we will get back to you with an evaluation of the room dimentions, room finishes, reverberation time, direct and reflected noise paths, and the location of acoustical treatment.

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23 Noise Control Basics & Acoustical Product Directory eBook

Our eBook – Noise Control Basics & Acoustical Product Directory eBook is now available on at Amazon for $2.99.

If you get the book please let me know if you have any comments or questions. I would like to build on this each year and make it a practical resource so that people can solve many of their own acoustical problems.

Here is the table of contents:

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22 T60 Reverberation Time

While analyzing an area containing an excessive amount echo or the noise buildup that is too high, reverberation time analysis is often used. Reverberation time is a measure of the time noise remains in a space soon after it is produced. Particularly, reverberation time pertains to the time needed for noise in a space to fall 60 dB following it being turned off.

The preferred reverberation time in a space depends upon its size, together with its use. For example, with talking, a short reverberation period is desired. Should the reverberation period be too long, a person listening will hear noise from more than one word at the same time and the speech will be garbled and not easily understood. Alternatively, for music in a space with a prolonged reverberation period, the musical notes blend collectively which is much more pleasing than dried lifeless noise. So how the area is used has a great deal to do with what reverberation period is most attractive.

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19 Theatre Acoustics

Noise Expert (acoustical engineers) recently completed an evaluation of a theatre located in Prescott, Arizona.  The challenge was that they wanted to preserved a barrel vaulted ceiling.  The ceiling is not steeply sloped – the focal point is several feet below the floor.

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6 Indoor Theme Parks

Noise Expert has evaluated the noise at several indoor attractions including: Sea Life and Lego Land.  The primary noise issues that we addressed was sound isolation between display areas (where walls do not go to the structure) and the room acoustics in various spaces.  Our study included predictions and measurements.

2 Scottsdale Call Center Speech Privacy

A call center in Scottsdale, Arizona asked Noise Expert to evaluate speech privacy at their open office facility.  They currently use a masking system that had inconsistent coverage to improve speech privacy.  The noise between workstations travels by several paths, including, diffracting over the partitions, through the partitions, around the partitions, reflected off of the ceiling, reflected off of the walls, and reflected within the workstation walls to other workstations.

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