Evaluation of Decay Times from Noisy Room Responses with Pure-Tone Excitation

Meissner, Mirosław

doi:10.2478/aoa-2013-0006

Cited by 7 publications

(7 citation statements)

References 22 publications

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“…Kumaresan and Rao 45 showed that in case of a single frequency excitation the minimumphase condition is verified; the infrequent applications of Hilbert transform-based methods for calculating the reverberation time may be related to this need of a single frequency excitation of the sound field. 27 Once the decay curve y(t) is determined, its fitting function x(t) in Eq. (1) must be calculated.…”

Section: Extraction Of the Reverberation Timementioning

confidence: 99%

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Extraction of the envelope from impulse responses using pre-processed energy detection for early decay estimation

Cesaris

D’Orazio

Morandi

et al. 2015

The Journal of the Acoustical Society of America

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The Schroeder's backward integration method and its applications have been widely studied in the literature; some papers analyze the performance of the method, some others suggest various enhancement techniques. In spite of these findings, there exist several cases where the energy decay curve extracted using the classical backward integration method and the parameters computed from it seem not always representative of the phenomenon under study. Among them, the cases where the early decay is dependent on strong, distinct reflections occurring just after the direct wave, as in most Italian opera houses. Other cases are measured impulse responses with a very low signal-to-noise ratio or missing the direct wave. In the literature, alternatives to the Schroeder's method have been proposed, ranging from Hilbert transform to non-linear processing techniques. In this work a method for the extraction of the envelope based on pre-processed energy detection for early decay estimation is proposed. It is shown that it returns an envelope well matching the first part of the decay even in non-linear cases, returning detailed information on the first part of the decay. The performance of the proposed method is presented and discussed for some exemplary impulse responses measured in historical opera houses. A preliminary study on the perceptive relevance of the method is finally presented.

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Section: Extraction Of the Reverberation Timementioning

confidence: 99%

“…38 On the other hand, an alternative proposed in the literature is the construction of the envelope, which is not constrained by any assumption. [25][26][27] Its main drawback is that the envelope is not equivalent to the ensemble average of a large number of decay curves as the Schroeder's integral is.…”

Section: Introductionmentioning

confidence: 99%

Extraction of the envelope from impulse responses using pre-processed energy detection for early decay estimation

Cesaris

D’Orazio

Morandi

et al. 2015

The Journal of the Acoustical Society of America

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“…Other versions of this method may be found in (Xu, Sommerfeldt, 2010). The Fourier method is difficult to apply for rooms with complex shapes and complex boundary conditions, and in more practical cases it is unusable (Meissner, 2012;2013a;2013b).…”

Section: Introductionmentioning

confidence: 99%

An Influence of the Wall Acoustic Impedance on the Room Acoustics. The Exact Solution

Brański

Kocan-Krawczyk

Prędka

2017

Archives of Acoustics

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The Fourier method is applied to the description of the room acoustics field with the combination of uniform impedance boundary conditions imposed on some walls. These acoustic boundary conditions are expressed by absorption coefficient values In this problem, the Fourier method is derived as the combination of three one-dimensional Sturm-Liouville (S-L) problems with Robin-Robin boundary conditions at the first and second dimension and Robin-Neumann ones at the third dimension. The Fourier method requires an evaluation of eigenvalues and eigenfunctions of the Helmholtz equation, via the solution of the eigenvalue equation, in all directions. The graphic-analytical method is adopted to solve it It is assumed that the acoustic force constitutes a monopole source and finally the forced acoustic field is calculated. As a novelty, it is demonstrated that the Fourier method provides a useful and efficient approach for a room acoustics with different values of wall impedances. Theoretical considerations are illustrated for rectangular cross-section of the room with particular ratio. Results obtained in the paper will be a point of reference to the numerical calculations.

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“…Moreover, the acoustic behaviour of a spherical sound source inside a quarterspace has been analyzed (Hasheminejad, Azarpeyvand, 2004). The acoustic properties of rectangular rooms have also been discussed (Aretz et al, 2014;Godinho et al, 2011;Meissner, 2013). Acoustic waves propagated in wedges have been analyzed by use of various methods (Abawi, Porter, 2007; Fig.…”

Section: Introductionmentioning

confidence: 99%

Sound Radiation from a Surface Source Located at the Bottom of the Wedge Region

Szemela¹

2015

Archives of Acoustics

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Applying rigorous analytical methods, formulas describing the sound radiation have been obtained for the wedge region bounded by two transverse baffles with a common edge and bottom. It has been assumed that the surface sound source is located at the bottom. The presented formulas can be used to calculate the sound pressure and power inside the wedge region. They are valid for any value of the wedge angle and represent a generalization of the formulas describing the sound radiation inside the two and three-wall corner region. Moreover, the presented formulas can be easily adapted for any case when more than one sound source is located at the bottom. To demonstrate their practical application, the distribution of the sound pressure modulus and the sound power have been analyzed in the case of a rectangular piston located at the wedge's bottom. The influence of the transverse baffle on the sound power has been investigated. Based on the obtained formulas, the behaviour of acoustic fields inside a wedge can be predicted.

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Evaluation of Decay Times from Noisy Room Responses with Pure-Tone Excitation

Cited by 7 publications

References 22 publications

Extraction of the envelope from impulse responses using pre-processed energy detection for early decay estimation

Extraction of the envelope from impulse responses using pre-processed energy detection for early decay estimation

An Influence of the Wall Acoustic Impedance on the Room Acoustics. The Exact Solution

Sound Radiation from a Surface Source Located at the Bottom of the Wedge Region

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