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Despite the recent trend of digital transformation in the music industry, the popularity of guitar effects pedals (GEPs) designed with analog components has not declined. This paper describes the complexity of the nonlinear characteristics of the analog circuitry in a distortion pedal, which originates not only from clipping diodes but also from the integrated operational amplifier itself. It is well known that variation in the supply voltage of a distortion pedal influences its sound. Based on this phenomenon, we have designed a voltage-starving circuit to control various distorted transfer functions depending on the frequency. Particular attention is given to the difference between odd and even nonlinearity in the mechanism of generating intermodulation distortion (IMD) for two-tone dissonance and consonance. These transfer functions are analyzed in detail using a 9th-order polynomial approximation. As a result, all peaks of the intermodulation frequencies are successfully identified in a complex spectrum. Furthermore the spectral shape of the measured IMD peaks is reproduced with an error of less than 50 dB by the simulation of their approximate formula.
Author (s): Inui, Masaki; Hamasaki, Toshihiko; van der Veen, Menno
Affiliation:
Information Systems and Science, Graduate School of Science and Technology, Hiroshima Institute of Technology, Hiroshima, 731-5193, Japan; Information Systems and Science, Graduate School of Science and Technology, Hiroshima Institute of Technology, Hiroshima, 731-5193, Japan; Ir. Bureau Vanderveen, 8743KZ 18, Hichtum, The Netherlands
(See document for exact affiliation information.)
Publication Date:
2021-01-06
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Inui, Masaki; Hamasaki, Toshihiko; van der Veen, Menno; 2021; Intermodulation Distortion Analysis of a Guitar Distortion Pedal With a Starving Circuit [PDF]; Information Systems and Science, Graduate School of Science and Technology, Hiroshima Institute of Technology, Hiroshima, 731-5193, Japan; Information Systems and Science, Graduate School of Science and Technology, Hiroshima Institute of Technology, Hiroshima, 731-5193, Japan; Ir. Bureau Vanderveen, 8743KZ 18, Hichtum, The Netherlands; Paper ; Available from: https://aes2.org/publications/elibrary-page/?id=21018
Inui, Masaki; Hamasaki, Toshihiko; van der Veen, Menno; Intermodulation Distortion Analysis of a Guitar Distortion Pedal With a Starving Circuit [PDF]; Information Systems and Science, Graduate School of Science and Technology, Hiroshima Institute of Technology, Hiroshima, 731-5193, Japan; Information Systems and Science, Graduate School of Science and Technology, Hiroshima Institute of Technology, Hiroshima, 731-5193, Japan; Ir. Bureau Vanderveen, 8743KZ 18, Hichtum, The Netherlands; Paper ; 2021 Available: https://aes2.org/publications/elibrary-page/?id=21018
@article{inui2021intermodulation,
author={inui masaki and hamasaki toshihiko and van der veen menno},
journal={journal of the audio engineering society},
title={intermodulation distortion analysis of a guitar distortion pedal with a starving circuit},
year={2021},
volume={69},
issue={1/2},
pages={80-103},
month={january},}