Sound Pressure Level
Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average, or equilibrium) atmospheric pressure, caused by a sound wave.
Sound pressure level or sound level is a logarithmic measure of the rms sound pressure of a sound relative to a reference value.
When referring to measurements of power or intensity, a ratio can be expressed in decibels by evaluating ten times the base-10 logarithm of the ratio of the measured quantity to the reference level. Here we can calculate Sound Pressure Level, Sound and Reference Pressure.
Thus, the ratio of a power value P to another power value P0 is represented by LdB, that ratio expressed in decibels.
|Sound Pressure Level (in dB) (dimensionless)
|The root mean square Sound Pressure (Pa)
|Reference Pressure (Pa)