Parallelepiped Source Propagation Loss
Strutt|Propagation|Parallelepiped provides the correction for sound power radiated over a parallelepiped, given the length, width, height and distance in metres from the source.
This is implemented as:
`x = 10log_10(S)`, where
`S = 4[(1/2 A + r)(1/2 B + r) + (1/2 B + r)(C + r) + (C + r)(1/2 A + r)]`
This calculation assumes that the source is located on a reflective plane.
For the vast majority of situations, the conformal area calculation is more appropriate. However, some ISO standards require the use of this parallelepiped calculation.
Comments or suggestions to