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An Emulation of the EMT 140 Plate Reverberator Using a Hybrid Reverberator Structure

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A digital emulation of the Elektromesstechnik (EMT) 140 plate reverberator is presented. The EMT 140 consists of a signal plate and a moveable damping plate; it is approximately linear and time invariant, and its impulse response is characterized by a whip-like onset and high echo density. Here, the hybrid reverberator proposed by Stewart and Murphy, in which a short convolution is run in parallel with a feedback delay network (FDN), is used to model the plate. The impulse response onset is only weakly dependent on the damping control, and is modeled by the convolution; the FDN is fit to the impulse response tail. The echo density, equalization and decay rates are matched at the transition between the convolution and FDN.

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