Freeverb Allpass Approximation
In Eq.(3.2) we defined the allpass notation by
A true allpass is obtained only for (reciprocal of the ``golden ratio''). The default value used in Freeverb (see revmodel.cpp) is . A detailed discussion of feedforward and feedback comb filters appears in §2.6, and corresponding Schroeder allpass filters are described in §2.8.
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Lowpass-Feedback Comb Filter