A-weighted sound level

A-weighted sound level

The sound level measured with a sound-level meter using A-weighting, which alters the sensitivity of the sound-level meter with respect to frequency so that the sound-level meter is less sensitive at frequencies where the ear is less sensitive; usually used in specifying permissible sound levels in buildings.
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One of the reasons of this--noise calculation software and methods used by environmental assessment professionals in transport infrastructure projects are adapted for calculating merely the overall A-weighted sound levels.