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Background noise
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<h2 id="other-uses">Other uses</h2> <p>In <a href="/facts/Astronomy/0ArJVM1p">astronomy</a>, background noise or <a href="/facts/Cosmic_background_radiation/NxByCI8f">cosmic background radiation</a> is <a href="/facts/Electromagnetic_radiation/Ynx7ujCW">electromagnetic radiation</a> from the sky with no discernible source. </p><p>In <a href="/facts/Information_architecture/xhAHVzA7">information architecture</a>, irrelevant, duplicate or incorrect information may be called background noise. </p><p>In <a href="/facts/Physics/a7aH2y08">physics</a> and <a href="/facts/Telecommunication/vxoj1cxR">telecommunication</a>, background <a href="/facts/Signal_noise/Izbv38Rr">signal noise</a> can be detrimental or in some cases beneficial. The study of avoiding, reducing or using signal noise is <a href="/facts/Information_theory/qNLH3U5P">information theory</a>. </p><p>In <a href="/facts/Telephony/2GwTTepw">telephony</a>, artificial <a href="/facts/Comfort_noise/3IvEmfKA">comfort noise</a> is used as a substitute for natural background noise, to fill in artificial silence created by <a href="/facts/Discontinuous_transmission/boTbwXJK">discontinuous transmission</a> systems using <a href="/facts/Voice_activity_detection/qbCG12fE">voice activity detection</a>. Background noise can also affect concentration. </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/4%2733%22/XtuKtPzJ">4'33"</a></li> <li><a href="/facts/Ambient_noise_level/0zDawBS7">Ambient noise level</a></li> <li><a href="/facts/Electronic_noise/Izbv38Rr">Electronic noise</a></li> <li><a href="/facts/The_Hum/8B66dGKT">The Hum</a></li> <li><a href="/facts/Colors_of_noise/q2v4WmXe">Colors of noise</a></li> <li><a href="/facts/Sound_masking/7uGdFfW2">Sound masking</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="http://www.acoustics.salford.ac.uk/acoustics_info/concert_hall_acoustics/?content=unwanted_sound">How low noise levels are achieved in concert halls</a></li> <li><a href="https://web.archive.org/web/20160811093157/https://goanimate.com/videos/0Olor_gMSsb4">Background noise in acoustics (demo)</a></li></ul>