Conference paper
Do wavelet filters provide more accurate estimates of reverberation times at low frequencies
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.
| Language: | English |
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| Publisher: | German Acoustical Society (DEGA) |
| Year: | 2016 |
| Pages: | 1088-1096 |
| Proceedings: | 45th International Congress and Exposition on Noise Control EngineeringInter-Noise |
| Types: | Conference paper |
| ORCIDs: | Agerkvist, Finn T. |
Acoustic decay Acoustic decays Acoustic noise Acoustic variables control Acoustics and Ultrasonics Architectural acoustics Bandpass filters Biased estimation Continous wavelet transform Continous wavelet transforms Continuous Wavelet Transform Filter banks Frequency bands Frequency dependent Frequency estimation Group delay Reverberation Reverberation time Wavelet filter banks Wavelet transforms Wavelets
