In acoustics, noise measurement can be for the purpose of measuring environmental noise[1] or measuring noise in the workplace. Applications include monitoring of construction sites, aircraft noise, road traffic noise, entertainment venues and neighborhood noise. One of the definitions of noise covers all "unwanted sounds".[2] When sound levels reach a high enough intensity, the sound, whether it is wanted or unwanted, may be damaging to hearing.[3] Environmental noise monitoring is the measurement of noise in an outdoor environment caused by transport (e.g. motor vehicles, aircraft, and trains), industry (e.g. machines) and recreational activities (e.g. music). The laws and limits governing environmental noise monitoring differ from country to country.
Various interventions are available to combat environmental noise. Roadway noise can be reduced by the use of noise barriers,[15] limitation of vehicle speeds,[16] alteration of roadway surface texture, limitation of heavy vehicles, use of traffic controls that smooth vehicle flow to reduce braking and acceleration, and tire design.[17] Aircraft noise can be reduced by using quieter jet engines,[18][19][20] altering flight paths and considering the time of day to benefit residents near airports.[21]Industrial noise is addressed by redesign of industrial equipment, shock mounted assemblies and physical barriers in the workplace.[22]
Noise may be measured using a sound level meter at the source of the noise.[23][24][25] Alternatively, an organization or company may measure a person's exposure to environmental noise in a workplace via a noise dosimeter.[26] The measurements taken using either of these methods will be evaluated according to the standards below.
Audio Systems and Broadcasting
Noise measurement can also be part of a test procedure using white noise, or some other specialized form of test signal. In audio systems and broadcasting, specific methods are used to obtain subjectively valid results in order that different devices and signal paths may be compared regardless of the inconsistent spectral distribution and temporal properties of the noise that they generate. In particular, the ITU-R 468 noise weighting was devised specifically for this purpose and is widely used for professional audio and broadcast measurements.
Standards
There are a number of standards for noise measurement, each with a different goal or focus, including:
