Howtosignalprocessing
- What is the sound pressure level?
- What is sound pressure level and how is it measured?
- What is sound pressure level used for?
- What is the difference between sound pressure and sound pressure level?
What is the sound pressure level?
Sound pressure level (SPL) is the pressure level of a sound, measured in decibels (dB). It is equal to 20 x the Log10 of the ratio of the Root Mean Square (RMS) of sound pressure to the reference of sound pressure (the reference sound pressure in air is 2 x 10-5 N/m2, or 0,00002 Pa).
What is sound pressure level and how is it measured?
One parameter of the acoustic (sound) wave which is generally used to assess sound exposure to humans is the sound pressure level expressed in μPa or Pa. Human ear' audible sound pressure levels range from 20 μPa (hearing threshold) till 20 Pa (pain threshold), resulting in the scale 1:10,000,000.
What is sound pressure level used for?
Sound pressure is the difference between the pressure from a sound wave and the ambient pressure of what the sound is traveling through (usually air for our purposes). The reason sound pressure levels and decibels are so important is that it gives us a numerical scale to work with to help prevent hearing loss.
What is the difference between sound pressure and sound pressure level?
A sound pressure is the pressure deviation from atmospheric pressure caused by a sound wave, in pascals. The sound pressure level (SPL) is a logarithmic measure of the ratio of a sound pressure over a reference sound pressure (corresponding to the hearing threshold of a young, healthy ear), quoted as a dB.
