Fluctuation Strength of Mixed Fluctuating Sound Sources

ACCOLTI, ERNESTO; MIYARA, FEDERICO

MECANICA COMPUTACIONAL

Mecánica Computacional

Año: 2009 vol. XXVI p. 9 - 22

Fluctuation Strength is the psychoacoustic parameter that describes how strongly or weakly sounds fluctuate.This parameter is sometimes called subjective or, more accurately, perceptual. It is well approximated, for fluctuating sounds coming from just one source, by models available in the literature. There are models, for frequency- or amplitude-modulated sinusoidal tones, as for amplitude-modulated broadband noises. These models depend on the loudness of sound, particularly on the frequency and depth of the modulation of loudness. Literature models assume that the modulating frequency is the same for all sound sources present in the signal.For this paper, some preliminary perception tests were conducted to find out the influence on FS when noises with different fluctuation patterns are mixed. The results demonstrate that, actually, the literature models cannot be extended for this kind of mixed sources.