Noise Calculator - Point Source Model

1 = whole (e.g. above soft ground)

2 = half (e.g. above hard ground)

4 = quarter (e.g. above hard ground on a wall)

8 = eighth space (e.g. in the corner of a room)

1 2 4 8

Notes

The calculations are for the point source model of sound propagation (6dB per doubling of distance). For sources of significant size, sound pressure levels must be input at source-to-receiver distances large enough to be sufficiently in the far-field, where inherent directivity is minimal. For a broadband source, this is where the distance is greater than the longest dimension of the source.

The calculations are based on free-field conditions, where there is no reverberant field.

For more in-depth help click here.