Phon
The phon is a logarithmic
SPL) in decibels of a similarly perceived 1 kHz pure tone.[3] For instance, if a sound is perceived to be equal in intensity to a 1 kHz tone with an SPL of 50 dB, then it has a loudness of 50 phons, regardless of its physical properties.[4] The phon was proposed in DIN 45631 and ISO 532 B by Stanley Smith Stevens.[5]
Definition
By definition, the loudness level in phons of a sound is the sound pressure level (in
SI unit in metrology. It is defined as a unit of loudness level by the American National Standards Institute in the Acoustical Terminology standard ANSI/ASA S1.1-2013
. Because the phon is a unit associated with a subjective percept, it is obtained by presenting the considered sound to a group of normal-hearing human listeners and by taking the median of the loudness levels they report.
Such measurements have been performed for known sounds, such as pure tones at different frequencies and levels. The equal-loudness contours are a way of mapping the dB SPL of a pure tone to the perceived loudness level in phons (see loudness for details).
See also
References
- ISBN 1-56396-283-7.
- ^ "dB: What is a decibel?". www.animations.physics.unsw.edu.au. Retrieved 2019-01-12.
- ^
Pease, C.B. (1974-07-01). "Combining the sone and phon scales". Applied Acoustics. 7 (3): 167–181. ISSN 0003-682X.
- ^ "Loudness Units: Phons and Sones". hyperphysics.phy-astr.gsu.edu. Retrieved 2019-01-12.
- ^ UNSW Music Acoustics
- ^ "phon". Welcome to ASA Standards. Acoustical Society of America. Retrieved 14 December 2020.
Further reading
- Paulin, Eugen (2007-09-01). Logarithmen, Normzahlen, Dezibel, Neper, Phon - natürlich verwandt! [Logarithms, preferred numbers, decibel, neper, phon - naturally related!] (PDF) (in German). Archived (PDF) from the original on 2016-12-18.