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A Fast Reverberation Estimator for Virtual Environments

One of the most distinctive acoustic parameters of a room is the reverberation as it gives the room its individual sound characteristic. Theoretically, late reverberation should possess a high degree of diffusion, where no concisely changes for different sources/receiver positions appear. Thus, late reverberation is often modeled by an artificial decaying reverberation tail assuming that the incident energy of arriving sound is equally distributed over all directions and the energy decreases exponentially with time. However, only a few rooms possess an ideal diffuse sound field in reality. Distinct acoustical effects such as (flutter) echoes or curved decays could therefore stay undetected. This work presents a fast statistical late reverberation estimator, which is incorporated into a real-time 3D audio rendering system. It provides more accurate results for the auralization of late reverberation by including temporal and spectral directivity information of arriving sound to the filter construction process, obtained by a fast ray tracing algorithm.

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