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Encyclopedia > Ambient noise level

In telecommunication, ambient noise level or room noise level is the level of acoustic noise existing at a given location, such as in a room, in a compartment, or at a place out of doors. Ambient noise level is measured with a sound level meter. It is usually measured in dB above a reference pressure level of 0.00002 Pa, i.e., 20 μPa (micropascals) in SI units. A pascal is a newton per square meter. the centimeter-gram-second system of units, the reference level for measuring ambient noise level is 0.0002 dyn/cm2.


Source: from Federal Standard 1037C and from MIL-STD-188




  Results from FactBites:
 
NPC Law Library: Los Angeles Noise Ordinance (3302 words)
At certain levels noises are detrimental to the health and welfare of the citizenry and in the public interests shall be systematically proscribed.
Ambient noise shall be averaged over a period of at least 15 minutes at a location and time of day comparable to that during which the measurement is taken of the particular noise source being measured.
The ambient noise level and the level of a particular noise being measured shall be the numerical average of noise measurements taken at a given location during a given time period.
System Noise Level (729 words)
System-noise level includes self noise generated by the vessel, ambient noise that exists in the water, and reverberation noise which is a function of the propagation paths and configuration of the acoustic system.
Ambient noise is that background noise level that exists in the ocean due mainly to marine life and man-made noise.
The significance of the noise levels shown in Figure 1 is that the dominant noise level (self noise) that is present during bathymetric operations is often given relative to the spectrum levels shown.
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