Authentic Modeling of Guitar Amplifiers and Effect Boxes
* Presenting author
The emulation of analog audio devices by using digital signal processing algorithms is a technique commonly referred to as amp modeling. The purpose of these algorithms is the imitation of the sound of a reference device in real-time as true to the original as possible.This paper discusses the circuit-based emulation of these (often highly) nonlinear effect circuits. The analog reference system, specified by the complete schematic, is described in this work using a nonlinear state-space representation. Special attention is payed to the involved nonlinear components, commonly discrete semiconductors or vacuum tubes, that often make a major contribution to the characteristic sound.As a case study, the approach is applied to two popular nonlinear analog circuits. It is shown that the resulting models preserve the sonic character of the reference and that simulation results and measurements align well.