Background noise

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Term background noise
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Definition

The combined noise present in a measurement system from sources other than the test aircraft, which can influence or obscure the aircraft noise levels being measured.

Definition Source

ICAO (2005) Official definition, ANNEX 16/I Environmental Protection — Aircraft Noise 2005, 4th ed., App 2-3 (3.1)

Note

Typical elements of background noise include (but are not limited to): ambient noise from sources around the microphone site; thermal electrical noise generated by components in the measurement system; magnetic flux noise (“tape hiss”) from analog tape recorders; and digitization noise caused by quantization error in digital converters. Some elements of background noise, such as digitization noise, can obscure the aircraft noise signal, while others, such as ambient noise, can also contribute energy to the measured aircraft noise signal.