Abstract
The CATT© room acoustic modeling program allows the computation of acoustic power projected to three mutualy perpendicular planes at a point in space integrated over a specified time period. By selecting successive time periods it is possible to observe the oscillatory nature of the transient power flow from first arrival to the long-term settled value during diffuse-field reverberant decay. The computation is normalized, and displayed as a fraction of the total power. Introducing scattering on the room surfaces results in a significantly smaller peak amplitude of power flow oscillation. Several cases are shown involving different room sizes and shapes and different orientations of source and receiver. Conclusions are made on the number of mean-free path intervals required to ‘‘settle’’ the computer-modeled acoustic field.
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