Artificial Reverberation

There are a variety of approaches to synthesizing the effect of a reverberant space. Approaches based on direct measurement of a particular room response (convolution techniques) tend to be less extensible and computationally expensive, though possible using special purpose hardware. The use of three-dimensional physical modeling techniques is also limited by computational requirements. Most current work in simulating reverberation is based on ``physically- and perceptually-informed'' techniques that seek to create parametrically-controllable systems. These models can produce very good reverberant responses though they generally cannot be made to correlate with actual room measurements.

Two excellent overviews of artificial reverbation developments are given by

Transfer-Function Models

Figure 2: A listener-source setup in a room.
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A Physical Modeling Approach

Perceptual Aspects of Reverberation

Early Reflections

Late Reverberation

Feedback Delay Networks (FDN)

Figure 8: A feedback delay network structure proposed for artificial reverberation by Jot (1992).
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Feedback (``Mixing'') Matrix Stability

Householder Feedback Matrices

Delay Lengths

Reverberation Time

Other Techniques: Image Method

Other Techniques: Convolution

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