Sound measurements
Sound pressure p
Particle velocity v
Particle velocity level (SVL)
(Sound velocity level)
Particle displacement ξ
Sound intensity I
Sound intensity level (SIL)
Sound power Pac
Sound power level (SWL)
Sound energy density E
Sound energy flux q
Surface S
Acoustic impedance Z
Speed of sound c
v  d  e

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 in a medium, mostly air. Sound pressure is the local Pressure deviation from the ambient (average or equilibrium pressure caused by a Sound Wave. Particle velocity is the velocity v of a particle (real or imagined in a medium as it transmits a Wave. Particle displacement or particle amplitude (represented in Mathematics by the lower-case Greek letter &xi) is a Measurement The sound intensity, I, (acoustic intensity is defined as the Sound power Pac per unit area A. Sound intensity level or acoustic intensity level is a Logarithmic measure of the Sound intensity in comparison to the reference level of 0 dB ( Decibels Sound power or acoustic power P ac is a measure of sonic Energy E per Time t unit Sound power level or acoustic power level is a logarithmic measure of the Sound power in comparison to a specified reference level The sound energy density or sound density (symbol E or w) is an adequate measure to describe the sound field at a given point as a sound energy value The sound energy q results from the integral Particle velocity v of the surface A, whereby only the portions perpendicularly to the surface In Mathematics, specifically in Topology, a surface is a Two-dimensional Manifold. The acoustic impedance Z (or sound impedance) is a frequency f dependent parameter and is very useful for example for describing the behaviour of musical Sound is a vibration that travels through an elastic medium as a Wave.

It shows the ratio of the particle velocity v1 and the particle velocity v0. Particle velocity is the velocity v of a particle (real or imagined in a medium as it transmits a Wave.

The particle velocity level is:

$L_v = 20\, \log_{10}\left(\frac{v_1}{v_0}\right) \mathrm{dB}$

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. The decibel ( dB) is a logarithmic unit of measurement that expresses the magnitude of a physical quantity (usually power or intensity relative to

If v0 is the standard reference particle velocity of:

$v_0 = 5.0 \times 10^{-8} \mathrm{\frac{m}{s}}$

we use "dB SVL". (SVL = sound velocity level).

Sound particle velocity v should not be confused with Sound velocity c. Particle velocity is the velocity v of a particle (real or imagined in a medium as it transmits a Wave.

© 2009 citizendia.org; parts available under the terms of GNU Free Documentation License, from http://en.wikipedia.org
network: | |