Particle velocity level
From Free net encyclopedia
The particle velocity level or the sound velocity level tells the ratio of a sound incidence in comparison to a reference level of 0 dB.
It shows the ratio of the particle velocity v1 and the particle velocity v0.
The particle velocity level is:
- <math>
L_v = 20\, \log_{10}\left(\frac{v_1}{v_0}\right) \mathrm{dB} </math>
where v1 and v0 are the velocities.
The particle velocity level has the letter "Lv".
The unit of the particle velocity level is named "dB".
Notice: The dB is dimensionless.
If v0 is the standard reference particle velocity of:
- <math>
v_0 = 5.0 \times 10^{-8} \mathrm{\frac{m}{s}} </math>
we use "dB SVL". (SVL = sound velocity level).