Noise Criteria (NC) Curves and Indoor Noise Levels

NC rating system for indoor background noise, recommended NC levels for various building spaces.

noisecriteriacurvesData Table

Overview

Engineering reference data for Noise Criteria (NC) Curves and Indoor Noise Levels in acoustics.

$c = \sqrt{\gamma R T}$

Speed of sound in an ideal gas.

$L = 10 \log_{10}(I/I_0)$

Decibel level.

$\lambda = c / f$

Wavelength = speed / frequency.