Background noise


Background noise

In acoustics and specifically in acoustical engineering, background noise is any sound other than the sound being monitored. Background noise is a form of noise pollution or interference. Background noise is an important concept in setting noise regulations.

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 as refrigerators or air 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 of ultrasound (e.g. for medical diagnosis or imaging), sonar and sound reproduction.

In astronomy, background noise or cosmic background radiation, is electromagnetic radiation from the sky with no discernible source.

In information architecture, irrelevant, duplicate or incorrect information may be called background noise.

In physics and telecommunication, background signal noise can be detrimental or in some cases beneficial. The study of avoiding, reducing or using signal noise is information 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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Look at other dictionaries:

  • background noise — background ,noise noun count or uncount noise that can be heard in addition to the main thing you are listening to …   Usage of the words and phrases in modern English

  • Background Noise —   [dt. »Hintergrundrauschen«], Rauschen …   Universal-Lexikon

  • background noise — noun extraneous noise contaminating sound measurements that cannot be separated from the desired signal • Syn: ↑ground noise • Hypernyms: ↑background, ↑background signal • Hyponyms: ↑surface noise * * * background noise UK US …   Useful english dictionary

  • background noise — UK / US noun [countable/uncountable] Word forms background noise : singular background noise plural background noises noise that can be heard in addition to the main thing you are listening to …   English dictionary

  • background noise — fono triukšmas statusas T sritis fizika atitikmenys: angl. background noise; hum noise vok. Grundrauschen, n rus. фоновый шум, m pranc. bruit de fond, m …   Fizikos terminų žodynas

  • background noise — /bækgraʊnd ˈnɔɪz/ (say bakgrownd noyz) noun 1. the accumulated noise which is always present in a normal environment. 2. irritating interruptions to one s mental processes coming from external sounds or from one s own random thoughts …   Australian English dictionary

  • background noise —    Any unwanted signal that enters a line, channel, or circuit; for example, electrical interference on a telephone circuit.    See also noise …   Dictionary of networking

  • background noise —    The level of intensity of signals due to normal activities other than the specific signal emission [16] …   Lexicon of Cave and Karst Terminology

  • background noise — random signals which interfere with information transfer …   English contemporary dictionary

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