New Family of Wave-Digital Triode Models

New Family of Wave-Digital Triode Models
Stefano D'Angelo and Vesa Välimäki Department of Signal Processing and Acoustics Aalto University School of Electrical Engineering Espoo, Finland, and
Jyri Pakarinen Dolby Laboratories, Stockholm, Sweden.
A new family of wave-digital vacuum tube triode models is presented. These models are inspired by the triode model by Cardarilli et al., which provides realistic simulation of the triode's transconductance behavior, and hence high accuracy in saturation conditions. The triode is modeled as a single memoryless nonlinear three-port wave digital filter element in which the outgoing wave variables are computed by locally applying the monodimensional secant method to one or two port voltages, depending on whether the grid current effect is taken into account. The proposed algorithms were found to produce a richer static harmonic response, introducing comparable or less aliasing and requiring approximately 50% less CPU time than previous models. The proposed models are suitable for real-time virtual analog circuit simulation.
Published in IEEE Transactions on Audio, Speech and Language Processing, vol. 21, no. 2, pp. 313-321, Feb. 2013.
Sound samples
Author: Stefano D'Angelo
Modified: 1.10.2012, Stefano D'Angelo