Encyclopedia > Phon

  Article Content

Phon

The phon is a unit of perceived loudness, which is a subjective measure of the intensity of a sound. At a frequency of 1 kHz, one phon is defined to be equal to one decibel of sound pressure level above the nominal threshold of hearing (1 picowatt/metre²).

At other frequencies, the phon departs from the decibel, but is related to it by a frequency weighting curve that reflects the frequency response of human hearing. The standard curve for human hearing is the A-weighted curve, but others are in use.



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Reformed churches

... eliminated them. In the 19th century, by state mandate the Reformed churches were combined with the Lutherans to form an Evangelical Union in Prussia. Reformed Church in ...

 
 
 
This page was created in 145.9 ms