- Background noise
In
acoustics and specifically inacoustical engineering , background noise is anysound other than the sound being monitored. Backgroundnoise is a form ofnoise pollution orinterference . Background noise is an important concept in settingnoise regulation s.Examples of background noises are environmental noises such as
waves ,traffic noise,alarms , people talking, bioacoustic noise from animals or birds and mechanical noise from devices such asrefrigerator s orair conditioning ,power supplies or motors.The prevention or reduction of background noise is important in the field of
active noise control . It is an important consideration with the use ofultrasound (e.g. for medical diagnosis or imaging),sonar andsound reproduction .In
astronomy , background noise orcosmic background radiation , iselectromagnetic radiation from the sky with no discernible source.In
information architecture , irrelevant, duplicate or incorrect information may be called background noise.In
physics andtelecommunication , backgroundsignal noise can be detrimental or in some cases beneficial. The study of avoiding, reducing or using signal noise isinformation theory .External links
* [http://www.acoustics.salford.ac.uk/acoustics_info/concert_hall_acoustics/?content=unwanted_sound How low noise levels are achieved in concert halls]
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