Parametric Spring Reverberation Effect
Vesa Välimäki, Julian D. Parker, Jonathan S. Abel · Journal of the Audio Engineering Society · 2010
A parametric modeling technique for emulating spring reverberation units is developed. A spectral delay filter consisting of a cascade of identical all-pass filters implements the chirplike initial response. A feedback loop containing a randomly modulated delay line produces multiple echoes of the initial pulse, which are progressively blurred over time to produce the reverberant tail of the response. The calibration of model parameters from measurements and from analytic results is shown.