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If the20 1 Introduction to Acousticsfluctuations occur more rapidly, the impression is given (approximately between 10 and 15 Hz) of a tonal roughness. The strength of this effect depends on the frequency position of the modulated tones, the fluctuation frequency, and also on the relative strength of the amplitude fluctuation; however, it is practically independent of the absolute sound pressure level (Terhardt, 1973, 1974).
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