In acoustics and specifically in acoustical engineering, background noise or ambient noise is any sound other than the sound being monitored (primary sound). Background noise is a form of noise pollution or interference. Background noise is an important concept in setting noise regulations. See noise criteria for cinema/home cinema applications. E...
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http://en.wikipedia.org/wiki/Background_noise
Related to actual sound, background noise adds atmosphere and realism to a given scene. It is often recorded at the same time that the film is being shot (as in location shots) or, can be added by the foley artist. (See `actual sound` and `foley artist.`)
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http://www.allmovie.com/glossary/term/background+noise
T The total noise floor from all sources of interference in a measurement system, independent of the presence of a data signal
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The noise level in a space, which is a composite of sound from HVAC, equipment, activity noises, etc., from both near and far, but excluding specific sources of interest such as a person talking in an adjacent space (which would be considered the signal)
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http://www.armstrong.com/commceilingsna/article22542.html
An unwanted, randomly fluctuating signal superimposed on the signal from a cosmic radio source.
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http://www.daviddarling.info/encyclopedia/B/background_noise.html
noise appearing at the output of a given equipment in the presence of the wanted signal NOTE - The term 'hiss' applies particularly to the case of an audible continuous noise.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=702-08-15
total of interference from all sources in a system used for the production, transmission, detection, measurement, or recording of a signal
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unwanted signals present at the output of a transmission channel in the absence of the wanted signal, when the channel is in normal operation
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In electronics, background noise is the aggregate of random noise in a sound-reproducing system, arising from such causes as radio interference, valve and other circuit noise, record scratch, etc. and not from the signal being reproduced.
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http://www.probertencyclopaedia.com/browse/GB.HTM
[
n] - extraneous noise contaminating sound measurements that cannot be separated from the desired signal
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http://www.webdictionary.co.uk/definition.php?query=background%20noise
Noise from all sources unrelated to a particular sound that is the object of interest. Background noise may include airborne, structureborne, and instrument noise.
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https://www.encyclo.co.uk/local/20687
ground noise noun extraneous noise contaminating sound measurements that cannot be separated from the desired signal
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