Phon Scale

To solve this, the was introduced.

The phon scale measures the "level" of loudness, while the sone scale measures the "magnitude" of loudness. phon scale

While both measure loudness, they serve different purposes in audio engineering and psychoacoustics: Phon Scale Sone Scale Logarithmic Purpose Measures loudness levels (matching) Measures relative loudness (how much louder) Reference 40 phons = 40 dB @ 1 kHz 1 sone = 40 phons Scaling Follows the dB scale 2 sones is twice as loud as 1 sone To solve this, the was introduced

A common rule of thumb is that an increase of roughly corresponds to a doubling of perceived loudness, which is represented by a doubling of the value in sones . Applications in Science and Industry Applications in Science and Industry The phon scale

The phon scale is a unit of measurement for loudness, defined as the loudness of a 1 kHz tone with a sound pressure level of 1 pascal (Pa) or 94 decibels (dB) SPL (sound pressure level). One phon is equal to one decibel at 1 kHz. The phon scale is a logarithmic scale, which means that a certain increase in phon value corresponds to a proportional increase in loudness.