Do wavelet filters provide more accurate estimates of reverberation times at low frequencies

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It has been amply demonstrated in the literature that it is not possible to measure acoustic decays without significant errors for low BT values (narrow filters and or low reverberation times). Recently, it has been shown how the main source of distortion in the time envelope of the acoustic decay is the frequency dependent group delay of the common implementations of the 1/3 and 1/1 octave filters. Some authors report good results using wavelet filter banks as an alternative to the usual filters. In this paper, a critical review of the performance of wavelet filter banks is undertaken. A filter bank using the continuous wavelet transform (CTW) has been implemented using a Morlet mother function. Although in general, the wavelet filter bank performs better than the usual filters, the influence of decaying modes outside the filter bandwidth on the measurements has been detected, leading to a biased estimation of the reverberation time in the frequency band of interest.
Original languageEnglish
Title of host publicationProceedings of the Inter-noise 2016
EditorsWolfgang Kropp
PublisherGerman Acoustical Society (DEGA)
Publication date2016
ISBN (Electronic) 978-3-939296-11-9
Publication statusPublished - 2016
Event45th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2016 - Hamburg, Germany
Duration: 21 Aug 201624 Aug 2016
Conference number: 45


Conference45th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2016
Internet address
SeriesProceedings of the Inter-noise 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future

    Research areas

  • Acoustics and Ultrasonics, Acoustic decay, Continous wavelet transform, Reverberation time, Wavelets, Acoustic noise, Acoustic variables control, Architectural acoustics, Bandpass filters, Filter banks, Frequency bands, Frequency estimation, Reverberation, Wavelet transforms, Acoustic decays, Biased estimation, Continous wavelet transforms, Continuous Wavelet Transform, Frequency dependent, Wavelet filter banks, Group delay

ID: 127693051