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EN 61672. IEC 61672 : 2013 "Electroacoustics – sound level meters" IEC 61252 : 1993 "Electroacoustics – specifications for personal sound exposure meters" IEC 60942 : 2003 "Electroacoustics – sound calibrators" IEC 62585 : 2012 "Electroacoustics – Methods to determine corrections to obtain the free-field response of a sound level meter"
A graph of the A-, B-, C- and D-weightings across the frequency range 10 Hz – 20 kHz Video illustrating A-weighting by analyzing a sine sweep (contains audio). A-weighting is a form of frequency weighting and 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. [1]
IEC 60651 Sound level meters (Withdrawn, replaced by IEC 61672-1:2002 and IEC 61672-2:2003) IEC 60652 Loading tests on overhead line structures; IEC 60654 Industrial-process measurement and control equipment – Operating conditions; IEC 60657 Non-ionizing radiation hazards in the frequency range from 10 MHz to 300 000 MHz
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A weighting curve is a graph of a set of factors, that are used to 'weight' measured values of a variable according to their importance in relation to some outcome. An important example is frequency weighting in sound level measurement where a specific set of weighting curves known as A-, B-, C-, and D-weighting as defined in IEC 61672 [1] are used.
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In the measurement of loudness, for example, an A-weighting filter is commonly used to emphasize frequencies around 3–6 kHz where the human ear is most sensitive, while attenuating very high and very low frequencies to which the ear is insensitive.
In professional audio specifications, a popular unit is the dBu. ... (IEC 61672-2013) [51] and the American National Standards Institute, ANSI S1.4, [52] ...