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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. Outside the US, the ISO Sound Reduction Index (SRI) is used.
The Sound Reduction Index is expressed in decibels (dB). It is the weighted sound reduction index for a partition or single component only. This is a laboratory-only measurement, which uses knowledge of the relative sizes of the rooms in the test suite, and the reverberation time in the receiving room, and the known level of noise which can pass between the rooms in the suite by other routes ...
A pair of headphones being tested inside an anechoic chamber for soundproofing. Soundproofing is any means of impeding sound propagation.There are several methods employed including increasing the distance between the source and receiver, decoupling, using noise barriers to reflect or absorb the energy of the sound waves, using damping structures such as sound baffles for absorption, or using ...
ISO 13472 Acoustics – Measurement of sound absorption properties of road surfaces in situ ISO 13472-1:2002 Part 1: Extended surface method; ISO 13472-2:2010 Part 2: Spot method for reflective surfaces; ISO 13473 Characterization of pavement texture by use of surface profiles ISO 13473-1:1997 Part 1: Determination of Mean Profile Depth
Gypsum concrete is a building material used as a floor underlayment used in wood-frame and concrete construction for fire ratings, sound reduction, radiant heating, and floor leveling. [1] It is a mixture of gypsum plaster, Portland cement , and sand .
Part 45 - Materials Part 46 - Visual presentation : Works in combination with part42 and allows to specify how to display 2D or 3D geometric models together with annotation data. The original design intend was that data according to this part could be displayed by computer systems supporting the Graphical Kernel System or PHIGS .
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