How Smooth Can You Go, Can You Go Down Low?: an analysis on the frequency-dependent roughness of velvet-noise

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.advisorFagerström, jon
dc.contributor.authorRoberts, Jade
dc.contributor.schoolSähkötekniikan korkeakoulufi
dc.contributor.supervisorVälimäki, Vesa
dc.date.accessioned2023-12-18T20:21:26Z
dc.date.available2023-12-18T20:21:26Z
dc.date.issued2023-12-11
dc.description.abstractTemporal roughness has been studied in earlier works on broadband velvet noise but, the frequency-dependency of temporal roughness has little previous research. Velvet noise is a sparse pseudo-random signal that has been applied to late reverberation modeling, decorrelation, speech generation and extending signals. This thesis explores combinative qualities such as pulse density, filter type and filter shape as well as a way to perceptually test their contribution to frequency-dependent temporal roughness. An adaptive perceptual test was conducted to find the lowest densities where velvet noise was still perceived as smooth at octave bands and corresponding lowpass bands. The results showed that the cutoff frequency of a lowpass filter as well as the center frequency of an octave filter is correlated with the perceived lowest density of smooth velvet noise. When the lowpass filter with the lowest cutoff frequency, 125 Hz, was applied, the filtered velvet noise sounded smooth at a median of 668 pulses/second and a median of 290 pulses/second for octave filtered noise at a center frequency of 125 Hz. For the broadband velvet noise, the minimal density of smoothness was found to be at a median of 1587 pulses/second. The results of this thesis are applicable in designing velvet-noise-based artificial reverberation with minimal pulse density.en
dc.format.extent43+6
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/125102
dc.identifier.urnURN:NBN:fi:aalto-202312187470
dc.language.isoenen
dc.locationP1fi
dc.programmeCCIS - Master’s Programme in Computer, Communication and Information Sciences (TS2013)fi
dc.programme.majorAcoustics and Audio Technologyfi
dc.programme.mcodeELEC3030fi
dc.subject.keywordvelvet noiseen
dc.subject.keywordfrequency-dependencyen
dc.subject.keywordsparse noiseen
dc.subject.keywordartificial reverberation modelingen
dc.subject.keywordtemporal smoothnessen
dc.titleHow Smooth Can You Go, Can You Go Down Low?: an analysis on the frequency-dependent roughness of velvet-noiseen
dc.typeG2 Pro gradu, diplomityöfi
dc.type.ontasotMaster's thesisen
dc.type.ontasotDiplomityöfi
local.aalto.electroniconlyyes
local.aalto.openaccessyes
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