High Quality Content by WIKIPEDIA articles! A weighting filter is used to emphasise or suppress some aspects of a phenomenon compared to others, for measurement or other purposes. In each field of audio measurement, special units are used to indicate a weighted measurement as opposed to a basic physical measurement of energy level. For sound, the unit is the phon. 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.

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