B Weighting
The B-weigthing curve approximately follows the 70 phon curve.
- The B-weighting curve follows the equation:
|
The following are tabulated standard B weighting values for the 1/3 Octave centre frequencies.
| Frequency Hz | B weighting dB | Frequency Hz | B weighting dB |
| 20 | -24.2 | 800 | 0.0 |
| 25 | -20.4 | 1000 | 0.0 |
| 31.5 | -17.1 | 1250 | 0.0 |
| 40 | -14.2 | 1600 | 0.0 |
| 50 | -11.6 | 2000 | -0.1 |
| 63 | -9.3 | 2500 | -0.2 |
| 80 | -7.4 | 3150 | -0.4 |
| 100 | -5.6 | 4000 | -0.7 |
| 125 | -4.2 | 5000 | -1.2 |
| 160 | -3.0 | 6300 | -1.9 |
| 200 | -2.0 | 8000 | -2.9 |
| 250 | -1.3 | 10000 | -4.4 |
| 315 | -0.8 | 12500 | -6.1 |
| 400 | -0.5 | 16000 | -8.4 |
| 500 | -0.3 | 20000 | -11.1 |
| 630 | -0.1 |
- The s-domain transfer function is:
- where s is the complex variable.
See also: A Weighting, C Weighting, dBB, G Weighted Overall Level, Z Weighting.
Subjects: Audio Noise & Vibration