phon

phon

[fon]
noun
a unit for measuring the apparent loudness of a sound, equal in number for a given sound to the intensity in decibels of a sound having a frequency of 1000 cycles per second when, in the judgment of a group of listeners, the two sounds are of equal loudness.

Origin:
1930–35; < Greek phōnḗ voice

Dictionary.com Unabridged

phon-

variant of phono- before a vowel: phonic.

phon.

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
phon (fɒn)
 
n
a unit of loudness that measures the intensity of a sound by the number of decibels it is above a reference tone having a frequency of 1000 hertz and a root-mean-square sound pressure of 20 × 10--6 pascal
 
[C20: via German from Greek phōnē sound, voice]

phon.
 
abbreviation for
1.  Also: phonet phonetics
2.  phonology

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

phon- pref.
Variant of phono-.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
phon   (fŏn)  Pronunciation Key 
A unit of apparent loudness. The loudness of a signal in phons is equal to the intensity in decibels of a 1,000-hertz tone judged to be as loud as the signal being measured.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Abbreviations & Acronyms
phon.
  1. phonetic

  2. phonetics

  3. phonology

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

phon

unit of loudness level. The loudness level of a sound is a subjective, rather than an objective, measure. To measure loudness, the volume of a 1,000-hertz reference tone is adjusted until it is perceived by listeners to be equally as loud as the sound being measured. The loudness level, in phons, of the measured sound is then equal to the sound-pressure level, in decibels, of the adjusted reference sound above the standard reference level, which is the minimum audible threshold. A variation of one phon in the loudness level of a sound is approximately the smallest change in sound-pressure level detectable by the human ear under normal listening conditions

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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