Nonlinear circuit simulation using time-variant filter

The dynamic simulation of nonlinear guitar effects has recently been studied in depth. There are several approaches to the simu-lation of the distortion guitar effects. This paper presents an al-gorithm based on using a digital linear time-variant filter for the simulation of the nonlinear circuit of diode limiter. Filter coeffi-cients are changed in each sample period according to the level of an input and output signal using numerical methods for the solu-tion of nonlinear functions. The designed algorithm was used in the distortion effect to examine its characteristics. Sound examples of the implemented distortion effect can be found at web page www.utko.feec.vutbr.cz/~schimmel/DAFx09/. 1