Q: Can I calculate diffraction over a barrier using a line source.

A: Only diffraction from point sources is calculated in ODEON. For this reason, a line source should be replaced by an array of point sources which will emit the same power as that of the line source. The power emission from the line source is defined as power per length (dB/m), i.e. power density. This means that if the point sources are placed 1 m apart, the sound power of each one should be the same with the power density of the line source. If the point sources are placed some other distance apart (e.g. 3 m), the sound power of each one should be increased by 10log10(distance).