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B Weighting  The B-weigthing curve approximately follows the 70 phon curve.
The B-weighting curve follows the equation:
 where - WB = 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.
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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.
  
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