Noise measurement

In acoustics, noise measurement can be for the purpose of measuring environmental noise 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". When sound levels reach a high enough intensity, the sound, whether it is wanted or unwanted, may be damaging to hearing. Environmental noise monitoring is the measurement of noise in an outdoor environment caused by transport, industry and recreational activities. The laws and limits governing environmental noise monitoring differ from country to country.

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==

Standards

There are a number of standards for noise measurement, each with a different goal or focus, including: • Standard:ITU-R BS 468 widely used in Broadcasting and professional Audio. • Standard:IEC A-weighting is widely used in Environmental Noise measurement. • Standard:CCIR recommendation 468-4 is now maintained as ITU-R BS 468 • Standard:CCITT 0.41 refers to 'Psophometric weighting' used on telephone circuits. • Standard:CCITT P53 is now continued as CCITT0.41 • Standard:BS 6402:1983 specifies Personal sound exposure meters. • Standard:BS 3539:1968 specifies Sound level meters for motor vehicle noise. • Standard:BSEN 60651 supersedes BS 5969:1981 Sound level meters ==See also==

Source: Wikipedia ↗

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