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.

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

Frequency HzB weighting dBFrequency HzB weighting dB
20-24.28000.0
25-20.410000.0
31.5-17.112500.0
40-14.216000.0
50-11.62000-0.1
63-9.32500-0.2
80-7.43150-0.4
100-5.64000-0.7
125-4.25000-1.2
160-3.06300-1.9
200-2.08000-2.9
250-1.310000-4.4
315-0.812500-6.1
400-0.516000-8.4
500-0.320000-11.1
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.

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Subjects: Audio Noise & Vibration