You can save and modify your own copy (in Google Docs or as a Excel spreadsheet) of the example below. NC - Noise Criterion - Interactive Spreadsheet Sound pressure levels are measured for different frequencies as:Īs indicated in the spreadsheet diagram below. NC rated noise should not exceed the limits listed below:Įxample - Estimate Rated Noise by using the Noise Criterion free apps for offline use on mobile devices. Related Mobile Apps from The Engineering ToolBox The noise spectrum is specified as having a NC rating same as the lowest NC curve which is not exceeded by the spectrum. The NC rating can be determined by plotting the measured sound pressure at each octave band. The criteria curves defines the limits of the octave band spectra that must not be exceeded to meet the occupants acceptance in the actual spaces. The method is based on a measurement of sound pressure levels and a set of sound pressure criteria curves ranging frequencies from 63 to 8000 Hz - and a tangent rating procedure. In Europe it is common to use the alternative Noise Rating Curve - NR. for rating indoor noise like noise from air-conditioning equipment and similar. Noise Criterion - NC - were established in the U.S.
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