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Roughness

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Psychoacoustics

Part of the book series: Springer Series in Information Sciences ((SSINF,volume 22))

Abstract

Using a 100% amplitude-modulated 1-kHz tone and increasing the modulation frequency from low to high values, three different areas of sensation are traversed. At very low modulation frequencies the loudness changes slowly up and down. The sensation produced is that of fluctuation. This sensation reaches a maximum at modulation frequencies near 4 Hz and decreases for higher modulation frequencies. At about 15 Hz, another type of sensation, roughness, starts to increase. It reaches its maximum near modulation frequencies of 70 Hz and decreases at higher modulation frequencies. As roughness decreases, the sensation of hearing three separately audible tones increases. This sensation is small for modulation frequencies near 150 Hz; it increases strongly, however, for larger modulation frequencies. This behaviour indicates that roughness is created by the relatively quick changes produced by modulation frequencies in the region between about 15 to 300 Hz. There is no need for exact periodical modulation, but the spectrum of the modulating function has to be between 15 and 300 Hz in order to produce roughness. For this reason, most narrow-band noises sound rough even though there is no periodical change in envelope or frequency. Roughness is again a sensation which we can consider while ignoring other sensations.

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© 1999 Springer-Verlag Berlin Heidelberg

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Zwicker, E., Fastl, H. (1999). Roughness. In: Psychoacoustics. Springer Series in Information Sciences, vol 22. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-09562-1_11

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  • DOI: https://doi.org/10.1007/978-3-662-09562-1_11

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-65063-8

  • Online ISBN: 978-3-662-09562-1

  • eBook Packages: Springer Book Archive

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