Detecting flutter echo

ODEON was used by Gade Akustik for the acoustic design of the Queens Hall in the expansion from 1999 of the Danish Royal Library (Known as the Black Diamond). This example illustrates how to track down a flutter echo. Read on below where two sound demos are also available.

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The Queens hall is mainly designed for chamber music but will also be used for rythmic music, meetings and lectures. It holds up to 600 people and its reverberation time can be adjusted from 1.1 s up to 1.8 s. Side-wall mounted acoustic diffusers prevent flutter echo.

This is illustarted in the two figures below, without and with diffusors on the side walls. Upper curve in the figures is the normal decay curve whereas the lower curve is the intensity curve displaying the directional fraction of the energy. You can also listen to the auralisation of the two scenarios.

Decay curves containing flutter echo simulated in Odeon.

Decay curves documenting the effect of diffusors in Queens Hall, simulated in Odeon.