Wall diffuser designs for acoustical renovation of small performing spaces

Jeon, Jin Yong; Seo, Choon Ki; Kim, Yong Hee; Lee, Pyoung Jik

doi:10.1016/j.apacoust.2012.01.003

Cited by 9 publications

(9 citation statements)

References 6 publications

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“…In this study, the authors focus on comparing the perceptual diffuseness at a certain position with the difference in N p , both with and without diffusers. Tables I and II show the conventional acoustic parameters (Ryu and Jeon, 2008;Jeon et al, 2012) and the N p parameters for Hall A and Hall B, respectively. The results of the early reflection (80 ms) show that the diffusive surfaces decreased the G and RT as a result of the weakening of the specular reflections and the smoothening of the sound decay in Hall A.…”

Section: Resultsmentioning

confidence: 99%

“…RSD EDT is defined as the standard deviation of the EDT divided by its mean in the space. The degree of diffuseness was then evaluated for other acoustical parameters (Jeon et al, 2012). The RSDs of G, 1-IACC E3 , and number of peaks (N p ) were also considered, but the RSD of C80 cannot be calculated because the C80 varied from minus to plus values.…”

Section: Methodsmentioning

confidence: 99%

“…The 433-seat Sejong Chamber Hall (Hall B) located in Seoul, South Korea is described by Jeon et al (2012). As shown in Fig.…”

Section: B Hall Bmentioning

confidence: 99%

“…The scattering coefficient is the scattered energy portion of the total energy and is calculated from the specular reflected portion, whereas the diffusion coefficient is used to describe the uniformity of directional scattering distribution based on surface diffusivity (Cox and D'Antonio, 2004;Cox et al, 2006). Recently, investigations have been conducted on the perception of spatial differences caused by the degree of surface corrugation on lateral walls (Ryu and Jeon, 2008;Jeon et al, 2012). Scale models of diffusers of various shapes were measured to establish the material characteristics for each basic shape (Chiles and Barron, 2004;Jeon et al, 2004;Kim et al, 2011a).…”

Section: Introductionmentioning

confidence: 99%

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Influence of wall scattering on the early fine structures of measured room impulse responses

Jeon¹,

Jang²,

Kim³

et al. 2015

The Journal of the Acoustical Society of America

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The effects of wall diffusing elements on sound-field diffuseness were investigated in a tenth-scale model hall and in a real recital hall. Acoustical measurements were carried out in both halls to measure the surface diffusivity of the lateral walls. In the scale model, the surfaces of the lateral walls and the soffits were covered with diffusers; in the recital hall, the front halves of both lateral walls were treated using reflective panels and absorptive materials. Objective characteristics were investigated using conventional room acoustic parameters and the number of peaks (Np) computed for the measured impulse responses, which were recorded under diffusive, reflective, and absorptive conditions. In addition, as a measure of the diffuse sound fields, the relative standard deviations (RSDs) of the acoustical parameters were investigated. The diffusive surfaces caused a decrease in the standard deviation of the early decay time and an increase in the Np at higher frequency bands. Auditory experiments using a paired comparison method revealed that the perception of subjective diffuseness could be quantified by using Np. In addition, one listener group's preference was correlated with Np and varied depending on different wall surface treatments.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The 433-seat Sejong Chamber Hall (Hall B) located in Seoul, South Korea is described by Jeon et al (2012). As shown in Fig.…”

Section: B Hall Bmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of wall scattering on the early fine structures of measured room impulse responses

Jeon¹,

Jang²,

Kim³

et al. 2015

The Journal of the Acoustical Society of America

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“…Therefore, the measurements were executed in 433-seat Sejong Chamber Hall (SCH) located in Seoul, South Korea and is described by [19]. It uses reverse-fan shaped and tilted side walls designed with saw-tooth-type diffusers (1-D corrugations) to provide diffusive reflections.…”

Section: B Auditorium Measurementsmentioning

confidence: 99%

Plane wave decomposition and beamforming for directional spatial sound localization

Imran

Jeon

Hussain³

2016

2016 13th International Bhurban Conference on Applied Sciences and Technology (IBCAST)

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Sound field decomposition using spherical microphone arrays has become a focus of interest for spatiotemporal analysis of the sound field in room acoustics, spatial audio rendering applications, and an estimation of the direction and localization of acoustic sources. The existing methods to localize acoustics sources and describe the sound field normally depend on omnidirectional sound field capturing by utilizing a few pairs of microphones and employing traditional correlation techniques. Therefore, these methods yield an approximate estimation of an overall acoustic analysis and parameters estimation of the captured sound field.In this paper, we performed sound field decomposition and beamforming to analyze the spatio-temporal structures of the captured impulse responses (IRs) using a 32-channel spherical microphone array in an anechoic chamber hall and in a real auditorium. We propose an approach based on a combination of plane wave decomposition (PWD), using spherical harmonics (SH) analysis, and an adaptive beamforming technique, as weighting filters for the PWD. Among adaptive beamforming techniques minimum variance distortionless response (MVDR) is investigated and used to compute the directional behavior of sound fields in the form of directional impulse responses (DIRs), in order to explain the influence of surrounding space on the propagation of the direct sound and several reflections. Furthermore, simultaneous localization of multiple sources and the variation in their temporal behavior is investigated and presented. The comparison between the results of computed directions of incidence of sound and the directions known beforehand showed a good agreement with each other inferring an effective application of spherical microphone arrays to sound field analysis.

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Investigation of the acoustical characteristics of organ pipes in a performing space

Jeon¹,

Hwang²,

Kim³

2014

Building and Environment

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Wall diffuser designs for acoustical renovation of small performing spaces

Cited by 9 publications

References 6 publications

Influence of wall scattering on the early fine structures of measured room impulse responses

Influence of wall scattering on the early fine structures of measured room impulse responses

Plane wave decomposition and beamforming for directional spatial sound localization

Investigation of the acoustical characteristics of organ pipes in a performing space

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