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The sone is a unit of perceived loudness after a proposal of S.S.Stevens in 1936. In acoustics, loudness is a subjective measure of the sound pressure. One sone is equivalent to 40 phons, which is defined as the loudness of a 1 kHz tone at 40 dB SPL. The number of sones to a phon was chosen so that a doubling of the number of sones sounds to the human ear like a doubling of the loudness, which also corresponds to increasing the sound pressure level by 10 dB, or increasing the sound pressure by a factor 3.16 (= root of 10). At frequencies other than 1 kHz, the measurement in sones must be calibrated according to the frequency response of human hearing, which is of course a subjective process. The study of apparent loudness is included in the topic of psychoacoustics.To be fully precise, a measurement in sones must be qualified by the optional suffix G, which means that the loudness value is calculated from frequency groups, and by one of the two suffixes F (for free field) or D (for diffuse field).
See also
hearingHearing is the following: Hearing is the sense by which sound is perceived. a hearing person is one that has hearing within normal parameters as opposed to one who is deaf or hard-of-hearing. In law, a hearing is a proceeding before a court or other decis
Units of measureThis topic differs from units of measurement, which see. Units of measure are the fundamental components of a problem. They are used in many fields to ensure accurate accounting of systems, ideas, and resources. They are exemplified in problems such as: I
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