Frequency Weighting
Human hearing is more sensitive to some frequencies than to others, and its
frequency response varies with level. In general, low frequency and high
frequency sounds appear to be less loud than mid-frequency sounds, and the
effect is more pronounced at low pressure levels, with a flattening of response at
high levels. Octave analysis and sound level meters therefore incorporate
weighting filters, which reduce the contribution of low and high frequencies to
produce a measurement that more nearly approximates how we hear.
Figure 144. Frequency weighting filter shapes.
The Spider provides A, C, and Z weightings conforming to IEC 61672-1 2002 and
B weighting conforming to IEC 60651 in both of Octave analysis and Sound Level
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