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Convention Paper

Multidimensional Perceptual Calibration for Distortion Effects Processing Software

Authors: Marui, Atsushi; Martens, William L.

AES Convention 113 · Paper 5708 · October 2002

Abstract

Controlled non-linear distortion effects processing produces a wide range of musically useful outputs, especially in the production of popular guitar sounds. But systematic control of distortion effects has been difficult to attain, due to the complex interaction of input gain, "drive" level, and "tone" controls. Rather than attempting to calibrate the output of commercial effects processing hardware, which typically employs proprietary distortion algorithms, a realtime software-based distortion effects processor was implemented and tested. Three distortion effect types were modeled using both waveshaping and a second order filter to provide more complete control over the parameters typically manipulated in controlling effects for electric guitars. The motivation was to relate perceptual differences between effects processing outputs and the mathematical functions describing the non-linear waveshaping producing variation in distortion. Perceptual calibration entailed the following listening sessions: First, listeners adjusted the tone of each of nine test outputs, then they made both pairwise dissimilarity ratings and attribute ratings for those nine stimuli. The results provide a basis for an effects-processing interface that is perceptually-calibrated for system users.

Details

Published in
AES Convention 113
AES Convention
113
Paper number
5708
Publication date
October 6, 2002
Session subject
Psychoacoustics
Affiliation
Multimedia Systems Lab., University of Aizu, Aizuwakamatsu-shi, Fukushima-ken, Japan (See document for exact affiliation information.)
Type
Convention Paper