Phon (acoustic)
The appreciation of the intensity of a its is correlative frequency and thus does not depend only on the Amplitude, of vibratory energy: the intensity perceived is evaluated by a unit without dimension, called phon . This unit characterizes the levels of equivalent perception of the intensity, which one names the isosonie of a sound or a noise.
History and definition
Sounds is a unit invented by Heinrich Georg Barkhausen. The phon was adopted by the first International Conference of Paris in 1937, as being the volume of a sound wave, considered by a person having a normal hearing and under standard conditions of listening, which has same volume as a sound wave having an acoustic pressure level of 1 decibel with 1 kilocycle. A noise has a volume of p phon (S) if the listener perceives it in the same way that a sound of 1 kilocycle and p decibel (S) of intensity. In the United States, sounds it is privileged with the phon with X (sound) = 10*log_2 (X) +40 (phons)
Related articles
- Its (physics)
- Acoustic
- musical Psychoacoustics
- Acoustics
Category: Acoustics
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