AES Dublin 2019
Tutorial T35

Saturday, March 23, 14:00 — 14:45 (Liffey Hall 1)

T35 - Noise Predictions with Sound Systems Using System Data & Complex Summation (Implemented in SoundPLAN & NoizCalc)

As the number of out-door events in urban areas is increasing, so are the challenges with and the awareness of the accompanied noise emission and therefore the need for accurate noise predictions. A new method for such noise predictions with sound reinforcement systems for outdoor events is introduced that uses system data of actual system designs and applies complex summation.

The system data including all electronic filters is simply imported with a system design file. This procedure eliminates any friction losses because it spares the repeated process of re-modeling a sound system in the noise prediction software and therefore ensures that the prediction is done with the actual system design. It also is the only sensible way to include the specific electronic filters (also IIR, FIR) of a sound system.

Noise prediction software did not consider complex summation simply because noise sources are always assumed not to be correlated with each other (e.g., in traffic and industry). This is where sound systems are quite different because the signals sent to the loudspeakers at different positions are usually always correlated. Furthermore, modern sound system even use coherence effects to influence directivity (e.g., arrays).

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