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Different rooms, locations, regulations, and applications may allow different acceptable noise ratings. In most cases, the goal is that background noise should not interfere with the purpose of the room, e.g. the noise of an office air-conditioning system and consistent noise of traffic outside the building should not interfere with telephone ...
After determining the best dimensions of the room, using the modal density criteria, the next step is to find the correct reverberation time. The most appropriate reverberation time depends on the use of the room. RT60 is a measure of reverberation time. [9] Times about 1.5 to 2 seconds are needed for opera theaters and concert halls.
NIOSH communicates these recommended standards to regulatory agencies (including OSHA) and to others in the occupational safety and health community through the publication and dissemination of Criteria Documents such as the Criteria for A Recommended Standard - Occupational Noise Exposure.
Or roadway noise is measured as ambient sound, prior to introducing a hypothetical noise barrier intended to reduce that ambient noise level. Ambient noise level is measured with a sound level meter. [4] It is usually measured in dB relative to a reference pressure of 0.00002 Pa, i.e., 20 μPa (micropascals) in SI units. [5]
Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound.In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations.
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