Sound pressure levels are measured for different frequencies as:
The Noise Criterion can be estimated to
NC = 57 dB
as indicated in the spreadsheet diagram below.
You can save and modify your own copy (in Google Docs or as a Excel spreadsheet) of the example below.
Balanced Noise Criteria (NCB) curves are used to specify acceptable background noise levels in occupied spaces and include noise from air-conditioning systems and any other ambient noise. They are intended to replace the NC curves.
Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.
Acceptable noise - dBA - level at typical common locations.
Calculate Noise Criterion (NC) from octave band pressure levels.
Comparing Noise Criterion (NC, NCB, RNC) to Noise Rating (NR) and dB(A).
An online Noise Rating (NR) calculator.
The Noise Rating (NR) Curve used to determine acceptable indoor environments for hearing preservation, speech communication and annoyance.
The octave and the 1/3 octave band frequencies.
A noise measurement system for continuous or ambient noise in indoor environments.
An online Preferred Noise Criterion (PNC) calculator.
The Room Criteria (RC) is used to measure background noise in buildings for frequencies ranging 16 to 4000 Hz.
The EPA Equivalent Sound Level - Leq - quantifies the noise environment to a single value of sound level for any desired duration.
The EPA Sound Exposure Level - Ls - describes the noise from a variable source.
Introduction to decibel, sound power, intensity and pressure.
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