A-weighting
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A-weighting is the most commonly used of a family of curves defined in the International standard IEC 61672:2003 and various national standards relating to the measurement of sound pressure level, as opposed to actual sound pressure. The others are B, C, D and now Z weightings.Sound level, loudness, and sound pressure are not the same things; indeed there is not even a simple relationship between them, because the human hearing system is more sensitive to some frequencies than others, and furthermore, its frequency response varies with level, as has been demonstrated by the measurement of equa...
A-weighting is the most commonly used of a family of curves defined in the International standard IEC 61672:2003 and various national standards relating to the measurement of sound pressure level, as opposed to actual sound pressure. The others are B, C, D and now Z weightings.Sound level, loudness, and sound pressure are not the same things; indeed there is not even a simple relationship between them, because the human hearing system is more sensitive to some frequencies than others, and furthermore, its frequency response varies with level, as has been demonstrated by the measurement of equal-loudness contours. In general, low frequency and high frequency sounds are perceived to be not as loud as mid-frequency sounds, and the effect is more pronounced at low pressure levels, with a flattening of response at high levels. Sound pressure level meters therefore incorporate weighting filters, which reduce the contribution of low and high frequencies to produce a reading that corresponds approximately to what we hear.
