![]() ![]() 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 #Noise decibel Offline#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. to rate indoor noise like noise from air-conditioning equipment and similar. Sound Pressure Level - OSHA A-Weighted per Day - OSHA maximum A-weighted sound pressure levels allowed per day.Noise Criterion - NC - were established in the U.S.Sound Power - Sound power from sources like fans, jet engines, cars, humans and more.Sound Intensity, Power and Pressure Levels - Introduction to decibel, sound power, intensity and pressure.Sound - L s - Exposure Level - The EPA Sound Exposure Level - L s - describes the noise from a variable source.Sound - L eq - Equivalent Level - The EPA Equivalent Sound Level - L eq - quantifies the noise environment to a single value of sound level for any desired duration.Sound - L dn - Day and Night Level - The EPA A-weighted sound level day and night equivalent definition - L dn - for a 24 hour period.RC - the Room Criteria - The Room Criteria (RC) is used to measure background noise in buildings for frequencies ranging 16 to 4000 Hz.Preferred Noise Criterion (PNC) - Calculator - An online Preferred Noise Criterion (PNC) calculator.PNC - the Preferred Noise Criterion - A noise measurement system for continuous or ambient noise in indoor environments. ![]() Outdoor Ambient Sound Pressure Levels - Outdoor ambient sound pressure levels (dBA) in rural and urban business and industrial environments with or without limited traffic.Noise generated by Road Traffic - Estimate noise level generated by traffic. ![]()
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