Fluctuation Strength of Mixed Fluctuating Sound Sources

Abstract

A preliminary study was carried out with broadband noises and a few subjects. The result was that fluctuation strength models for sounds with the same modulation frequency, as those available in the literature, are not extensible for combined signals modulated with different modulation frequencies. An exploratory study of fluctuation strength of combined fluctuating tone signals with different modulation frequencies was conducted by magnitude estimation experiments. For that purpose a graphical and interactive software interface was developed. The interface manages the test sounds and 10 anchor sounds that the user can listen until he or she is convinced of the magnitude estimation. A computational procedure was implemented to choose the modulation index of the anchor sounds that exhibits equally spaced fluctuation strength. Although no correlation was found, some possiblerelated objective-parameters are described. Computational models for accounting those possiblerelated objective-parameters are implemented.