C Weighting
The C-weighting curve approximately follows the 100 phon curve.
- The C-weighting is described by the equation below:
|
The following are tabulated standard C weighting values for the 1/3 Octave centre frequencies.
| Frequency | C-wgt | Frequency | C-wgt |
| 20 | -6.2 | 800 | 0.0 |
| 25 | -4.4 | 1000 | 0.0 |
| 31.5 | -3.0 | 1250 | 0.0 |
| 40 | -2.0 | 1600 | -0.1 |
| 50 | -1.3 | 2000 | -0.2 |
| 63 | -0.8 | 2500 | -0.3 |
| 80 | -0.5 | 3150 | -0.5 |
| 100 | -0.3 | 4000 | -0.8 |
| 125 | -0.2 | 5000 | -1.3 |
| 160 | -0.1 | 6300 | -2.0 |
| 200 | 0.0 | 8000 | -3.0 |
| 250 | 0.0 | 10000 | -4.3 |
| 315 | 0.0 | 12500 | -6.2 |
| 400 | 0.0 | 16000 | -8.5 |
| 500 | 0.0 | 20000 | -11.2 |
| 630 | 0.0 |
- 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.
Subjects: Audio Noise & Vibration