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Early Reflections
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Artificial Reverberation
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Convolutional or Transfer-Function Approaches
Perceptual Approach to Reverberation Simulation
Based on perceptual limits, the impulse response of a reverberant space can be divided into two segments:
The beginning of the impulse response consists of distinct, relatively sparse,
early reflections
.
The remainder of the impulse response, called the
late reverberation
, consists of densely-packed echoes that become impossible to distinguish in time.
This region of high echo density (which increases as
) can be approximated by a random time distribution.
The frequency response of a reverberant space can likewise be divided into two segments:
The low-frequency region consists of a relatively sparse distribution of resonant modes.
Higher-frequency modes are packed so densely that they are best characterized by a random frequency distribution with certain statistical properties.
Parametric controls for an artificial reverberator would ideally include:
in at least three frequency bands
= signal power gain
= "clarity" (ratio of impulse response energy in early reflections to that in the late reverb section)
inter-aural correlation coefficient
at the left and right ears
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.