When sound is modulated at frequencies up to 20 Hz, the sensation is that of fluctuation strength. At faster amplitude variations, the sensation is that of roughness. This report describes a new model for calculating fluctuation strength based on equivalent rectangular bandwidth. By using 75 filter channels on the ERB number scale, the total fluctuation strength is calculated by weighting, filtering, and adding the generalized modulation depth (GMD) in each channel. The model changes the way that GMD is converted into specific fluctuation strength. Using an ERB number scale instead of Bark scale provides other advantages. The calculated results using the new model are more consistent with subjective ratings with an RMS error that is decreased by 90% and correlation coefficients are increased by 20%. The proposed model can be used for both narrow and wideband noises.
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