C Weighting

The C-weighting curve approximately follows the 100 phon curve.


The C-weighting is described by the equation below:
where
WC = weighting to be applied, dB
f = frequency, Hz


Enter frequency and level in either dB or dB(B) to get conversion and weighting or frequency only to get weighting.

The following are tabulated standard C weighting values for the 1/3 Octave centre frequencies.

FrequencyC-wgtFrequencyC-wgt
20-6.28000.0
25-4.410000.0
31.5-3.012500.0
40-2.01600-0.1
50-1.32000-0.2
63-0.82500-0.3
80-0.53150-0.5
100-0.34000-0.8
125-0.25000-1.3
160-0.16300-2.0
2000.08000-3.0
2500.010000-4.3
3150.012500-6.2
4000.016000-8.5
5000.020000-11.2
6300.0
The s-domain transfer function is:
where s is the complex variable.

See also: A Weighting, B Weighting, G Weighted Overall Level, Impulsive Noise, Z Weighting.

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Subjects: Audio Noise & Vibration