Sound intensity level

In psychophysics, the average sound energy per unit area perpendicular to the direction of sound wave propagation per unit time is called sound intensity. Sound intensity is represented by I, and its unit is watts per square meter. Psychophysics research shows that people's perception of sound intensity is not proportional to sound intensity, but proportional to its logarithm. This is why people use sound intensity level to represent sound intensity.

Its unit is Bel sound intensity level (Bel, Bel)

Ｌ＝ｌｏｇ （１０）［Ｉ／Ｉ０］＝ｌｇ（Ｉ/Ｉ０）

Most people can distinguish two sounds with an intensity difference of one tenth of a Bel, so it is more convenient to use one tenth of a Bel as the unit of sound intensity. This unit is called decibel, or decibel (dB) for short.

ＳＩＬ＝１０ｌｏｇ（１０）［Ｉ／Ｉ０］＝１０ｌｇ（Ｉ／Ｉ０）

In the formula, I is the sound intensity, I0=10^-12 W/m2 is called the reference sound intensity, and the commonly used unit of sound intensity level is decibel (dB).

Sound intensity level:

Sound intensity level calculation: SIL = 10log₁₀(I/I₀)

IL = Sound Intensity Level

I = Sound intensity

I₀ = Reference sound intensity