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Noiseology 101
noise•o•lo•gy [noiz-ol-uh-jee]
the art of noise control


A-Weighted dosimeter

The human ear does not respond to all frequencies equally. By reducing the effects of the low and high frequencies with respect to the medium frequencies, a better representation of the human ear's response to sound is obtained. The resultant sound level is said to be A-weighted.

Absorption
ab-sorp-tion [ab-sawrp-shuhn]

The process by which the intensity of sound is diminished by the conversion of the energy of the sound wave into heat.  Reduces reflected sound off of a surface.

Acoustics
a-cous-tics [uh-koo-stiks]
Acoustics is the science of sound, focusing on its production, transmission, reception, and effects.
Architectural Acoustics
ar-chi-tec-tur-al a-cous-tics [ahr-ki-tek-cher-uhl uh-koo-stiks]

The science of noise control applied within a building to adequately support the primary acoustic function within the space and its effect on the occupants.  A space with high acoustics has a lot of reflective surfaces and hard materials.

Baffle
baf-fle [bahf-uhl]
A free hanging acoustical sound absorbing unit. Suspended vertically in a variety of patterns to introduce absorption into a space to reduce reverberation and noise levels.
Decibel
dec-i-bel [des-uh-bel]
A dimensionless unit which denotes the ratio between two quantities that are proportional to power, energy or intensity. One of these quantities is a designated reference by which all other quantities of identical units are divided.
Frequency
fre-quen-cy [free-kwuhn-see]
The number of oscillations or cycles per unit of time. Acoustical frequency is usually expressed in units of Hertz (Hz) where one Hz is equal to one cycle per second.
Hearing Impairment
hear-ing im-pair-ment [heer-ing im-pair-ment]
A degree of hearing loss, temporary or permanent, due to many causes. Hearing loss can be caused by illness, disease or exposure to excessively high noise levels. Hearing impaired persons are particularly adversely affected by long reverberation times.
Hearing Range
hear-ing range [heer-ing reynj]

600 - 4000 Hz (Speech Intelligibility Range)
20 -  20000 Hz (Primary Human Hearing Range)
250 - 2500 Hz (Typical small table radio)

Reverberant Noise
re-ver-ber-ant [ri-vur-buh-rant]

The persistence of sound in a space after the source is removed. Common in large spaces where rigid building materials are present.

Sound Level Meter
A noise monitoring tool that measures noise levels and displays them instantly. A sound level meter is specific to the immediate area where the measurement is being taken. These measurements are also referred to as area sampling.
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