Use of Wavelet Transform for the Computation of Modal Decay Times in Rooms

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R. Magalotti, and D. Ponteggia, "Use of Wavelet Transform for the Computation of Modal Decay Times in Rooms," Paper 10235, (2019 October.). doi:
R. Magalotti, and D. Ponteggia, "Use of Wavelet Transform for the Computation of Modal Decay Times in Rooms," Paper 10235, (2019 October.). doi:
Abstract: The acoustic behavior of small rooms in the modal frequency band can be characterized by the modal decay times MT60. The paper explores a method for computing modal decay times from measurements of Room Impulse Responses (RIR) based on the wavelet transform. Once the resonance frequencies have been selected, the procedure computes a series of wavelet transforms of the Morlet type with decreasing bandwidth, exploiting the property that Morlet wavelets preserve the time history of energy decay. Then decay times can be calculated either by linear regression of the non-noisy portion of the curve or by nonlinear fitting of a model of decay plus noise. Examples of application of the method to real RIR measurements are shown.

@article{magalotti2019use,
author={magalotti, roberto and ponteggia, daniele},
journal={journal of the audio engineering society},
title={use of wavelet transform for the computation of modal decay times in rooms},
year={2019},
volume={},
number={},
pages={},
doi={},
month={october},}
@article{magalotti2019use,
author={magalotti, roberto and ponteggia, daniele},
journal={journal of the audio engineering society},
title={use of wavelet transform for the computation of modal decay times in rooms},
year={2019},
volume={},
number={},
pages={},
doi={},
month={october},
abstract={the acoustic behavior of small rooms in the modal frequency band can be characterized by the modal decay times mt60. the paper explores a method for computing modal decay times from measurements of room impulse responses (rir) based on the wavelet transform. once the resonance frequencies have been selected, the procedure computes a series of wavelet transforms of the morlet type with decreasing bandwidth, exploiting the property that morlet wavelets preserve the time history of energy decay. then decay times can be calculated either by linear regression of the non-noisy portion of the curve or by nonlinear fitting of a model of decay plus noise. examples of application of the method to real rir measurements are shown.},}

TY - paper
TI - Use of Wavelet Transform for the Computation of Modal Decay Times in Rooms
SP -
EP -
AU - Magalotti, Roberto
AU - Ponteggia, Daniele
PY - 2019
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - October 2019
TY - paper
TI - Use of Wavelet Transform for the Computation of Modal Decay Times in Rooms
SP -
EP -
AU - Magalotti, Roberto
AU - Ponteggia, Daniele
PY - 2019
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - October 2019
AB - The acoustic behavior of small rooms in the modal frequency band can be characterized by the modal decay times MT60. The paper explores a method for computing modal decay times from measurements of Room Impulse Responses (RIR) based on the wavelet transform. Once the resonance frequencies have been selected, the procedure computes a series of wavelet transforms of the Morlet type with decreasing bandwidth, exploiting the property that Morlet wavelets preserve the time history of energy decay. Then decay times can be calculated either by linear regression of the non-noisy portion of the curve or by nonlinear fitting of a model of decay plus noise. Examples of application of the method to real RIR measurements are shown.

The acoustic behavior of small rooms in the modal frequency band can be characterized by the modal decay times MT60. The paper explores a method for computing modal decay times from measurements of Room Impulse Responses (RIR) based on the wavelet transform. Once the resonance frequencies have been selected, the procedure computes a series of wavelet transforms of the Morlet type with decreasing bandwidth, exploiting the property that Morlet wavelets preserve the time history of energy decay. Then decay times can be calculated either by linear regression of the non-noisy portion of the curve or by nonlinear fitting of a model of decay plus noise. Examples of application of the method to real RIR measurements are shown.

Authors:
Magalotti, Roberto; Ponteggia, Daniele
Affiliations:
B&C Speakers S.p.A., Bagno a Ripoli (FI), Italy; Audiomatica Srl, Firenze, Italy(See document for exact affiliation information.)
AES Convention:
147 (October 2019)
Paper Number:
10235
Publication Date:
October 8, 2019Import into BibTeX
Subject:
Room Acoustics
Permalink:
http://www.aes.org/e-lib/browse.cfm?elib=20608