Speaker
Description
Schroeder-curves or energy decay curves (EDC) of room impulse responses have a non-positive slope. As a consequence, when quantizing the decay range into level bins, the histogram of probability distribution of EDC levels shows basically the local decay slope or instantaneous decay time for each bin, because heights of bins denote times required to decay in each bin.This simple yet undiscussed representation has interesting and useful features. For example, signal to noise ratio of the response can be estimated without iterative steps. In addition, one can easily identify truncation error or qualify multi-exponential decays.The paper discusses how important features (single or multi decay rates, distinct echoes, truncation, noise) of theoretical decays appear in EDC histogram plots and how these plots relate to basic room acoustic parameters. The paper demonstrates also the application of this representation on measured enery decay curves.