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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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P
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Phon
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INFOTEXT
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1992-09-03
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275b
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9 lines
A phon is the unit of loudness, equal to the
value in decibels of an equally loud tone
with frequency 1,000Hz. The higher the
frequency, the louder a noise sounds for the
same decibel value. An aircraft engine has a
loudness of around 140 phons.
Subject by: Vince Pike