phon

A unit used in acoustics to measure the subjective loudness of a sound, based on a comparison with a reference tone.

• 🇫🇷Unité utilisée en acoustique pour mesurer la sonie subjective d'un son, basée sur la comparaison avec un ton de référence.

1. Unit of loudness C2 formal scientific

   A unit of subjective loudness, equal to the loudness of a sound that is judged by listeners to be equal to a reference sound of a given intensity.

   • The noise level in the factory was measured at 80 phons.
   • A sound of 40 phons is perceived as twice as loud as a sound of 30 phons.
   • The phon scale is used in acoustics to quantify perceived loudness.

   🇫🇷phone (unité de sonie)