Sone

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The sone is a unit of perceived loudness N after a proposal of S. Smith Stevens in 1936. In acoustics, loudness is a subjective measure of the sound pressure. At a frequency of 1 kHz, 1 phon is defined to be equal to 1 dB of sound pressure level L^p above the nominal threshold of hearing, the sound pressure level SPL of 20 µPa (micropascals) = 2 · 10^-5 pascal (Pa).
One sone is equivalent to 40 phons, which is defined as the loudness level N_L 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 =. 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).

[edit] See also

• sound pressure
• sound pressure level
• Phon
• dB(A)
• Stevens' power law
• Weber-Fechner law

[edit] External links

• Conversion: Loudness N (sones) to loudness level L (phons) and loudness level L (phons) to loudness N (sones)cs:Son (akustika)

de:Sone es:Sonio fr:Sone nl:Sone

This page uses content from the English-language version of Wikipedia. The original article was at Sone. The list of authors can be seen in the page history. As with Psychology Wiki, the text of Wikipedia is available under the GNU Free Documentation License.