Reverberation time measurements in non-diffuse acoustic field by the modal reverberation time

Prato, Andrea; Casassa, Federico; Schiavi, Alessandro

doi:10.1016/j.apacoust.2016.03.041

Cited by 31 publications

(25 citation statements)

References 10 publications

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“…The measurements were performed for 1/3 octave bands with center frequencies using the method of intermittent noise. The tests were performed for the six microphone positions (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) and two positions of sound source (P1, P2) to give a total of 12 spatially independent measured decay curves. Arrangement of the measurement points (1-6, 7-12) and the location of the sound source (P1, P2) is shown in Fig.…”

Section: Measurement Of the Reverberation Coefficient Of The Materialmentioning

confidence: 99%

“…4). Arrangement of measuring points (1)(2)(3)(4)(5)(6) and the location of the sound source (P1) is shown in Fig. 5.…”

Section: Measurement Of the Reverberation Time Of Small Roomsmentioning

confidence: 99%

“…More and more works on architectural acoustics involves the study of small rooms or measurements on low-frequencies [1,2]. In small rooms lack of diffuse sound field is the result of standing waves whose length is comparable with the size of the room.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Selected Methods Used For The Reverberation Time Estimation

Olechowska

Ślusarek

2016

Architecture, Civil Engineering, Environment

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The paper presents a comparison of the reverberation time of two boxed rooms considered in two variants. The purpose of the paper is the comparison of the reverberation time measurements results with the results obtained of the available equations and simulation in the ODEON software. The differences between the applicable models and computer simulation and measurement were analyzed. The determined values of the residual analysis were used to develop the rules for granting points to formulas or acoustic simulation. On this basis the choice of the best formula or acoustic simulation for a given octave frequency compared with the measured value was made.

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Section: Measurement Of the Reverberation Coefficient Of The Materialmentioning

confidence: 99%

“…4). Arrangement of measuring points (1)(2)(3)(4)(5)(6) and the location of the sound source (P1) is shown in Fig. 5.…”

Section: Measurement Of the Reverberation Time Of Small Roomsmentioning

confidence: 99%

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Analysis of Selected Methods Used For The Reverberation Time Estimation

Olechowska

Ślusarek

2016

Architecture, Civil Engineering, Environment

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“…When acoustic waves projected into the irregular surface inside the coke drum, they will scatter and reflect. Reverberation technology is mostly used to improve sound effects and for other commercial purposes [13][14][15][16]. Due to its scattering properties, it is rarely used in the field of measurement.…”

Section: Principles Of Reverberation In Closed Coke Drummentioning

confidence: 99%

Method for Detecting the Inside of Coke Drum Using Acoustic Signals

et al. 2017

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A distance and acoustic intensity reverberation (DAIR) physical model is developed that can be successfully applied to the signal processing of the hydraulic decoking process online monitoring. In this model, the transmission characteristics of acoustic signals generated by a moving sound source in a dynamic confined space are first analyzed using data recursion and correction according to the coordinate continuity in adjacent area and adjacent time. The results show that the nondetection zone of acoustic signals generated directly by the impact of water is eliminated, and the surface distribution of coke in the drum can be mapped in real time.

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“…The measurement results of reverberation time can be applied to determine the sound absorption coefficient of sound absorbing materials in the reverberation chamber [11]. One of the factors which affects the reverberation time is the manner in which sound is dispersed in the room [12]. Irregular distribution of sound absorbing materials in the room also affects the results obtained by means of various theoretical models.…”

Section: Introductionmentioning

confidence: 99%

The influence of the distribution of sound absorbing materials on the estimation of reverberation time in rooms

et al. 2018

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Abstract. Reverberation time in rooms depends on many factors, e.g. cubature, surface of envelopes, sound absorption coefficient of materials used for the construction of the envelopes, geometry of rooms or the distribution of sound absorbing materials. The arrangement of sound absorbing materials in rooms has an impact on the dispersion of acoustic field, yet theoretical calculation models do not take into account this impact. According to these models, regardless of the arrangement of sound absorbing materials, the reverberation time in a room will remain unchanged. The present paper investigates the above problem by means of computer simulations. For the needs of the simulation, three rooms with different dimensions were adopted, i.e. type 'p' -a cuboidal room with a square base, type 'd' -a cuboidal room (with one side of the 'p' room lengthened), type 'w' -a cuboidal room (with the height of the room lengthened 'p'). During the simulation, the way of acoustic field dispersion was being changed and its influence on the reverberation time in the rooms was being determined. The authors investigated two situations. The first one involved a non-dampened room, in which the sound absorbing material was being arranged differently. The second one involved a welldampened room, and the dispersion of sound field was analyzed depending on the location of the reflecting material.

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Reverberation time measurements in non-diffuse acoustic field by the modal reverberation time

Cited by 31 publications

References 10 publications

Analysis of Selected Methods Used For The Reverberation Time Estimation

Analysis of Selected Methods Used For The Reverberation Time Estimation

Method for Detecting the Inside of Coke Drum Using Acoustic Signals

The influence of the distribution of sound absorbing materials on the estimation of reverberation time in rooms

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