Shadowing of directional noise sources by finite noise barriers

Menounou, Penelope; Papaefthymiou, Evangelos

doi:10.1016/j.apacoust.2009.10.002

Cited by 14 publications

(16 citation statements)

References 33 publications

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“…The use of this solution allowed us to set an arbitrary inclination angle of the plane beyond the screen, in contrast to the DLSM method [15]. At the same time, this method is purely analytical, based on known solutions of the wave equation.…”

Section: Dependence Of Efficiency Of the Screen On The Size Of Thementioning

confidence: 99%

“…Article [14] reports results of numerical study into passage of sound through an opening in the screen, though in order to get adequate results for other geometry of the problem, it is advisable to have analytical relations. Paper [15] paid attention to the screens of finite length, which made it possible to determine the effect of sound propagation through the ends of the screen. The application of results of this work is possible, however, only for vertical screens and horizontal planes beyond the screen, which is not applicable, for example, to the inclined screens that are placed on bridges.…”

Section: Investigation Of the Efficiency Of A Noise Protection Screenmentioning

confidence: 99%

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Investigation of the efficiency of a noise protection screen with an opening at its base

Zaets

Kotenko

2017

EEJET

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Section: Dependence Of Efficiency Of the Screen On The Size Of Thementioning

confidence: 99%

Section: Investigation Of the Efficiency Of A Noise Protection Screenmentioning

confidence: 99%

Investigation of the efficiency of a noise protection screen with an opening at its base

Zaets

Kotenko

2017

EEJET

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“…Unfortunately, because most portable devices are limited in size, and coincident or near-coincident recording techniques are most appropriate for such devices. However, when the audio signals captured by these recording techniques are reproduced, the stereophonic images often do not feel sufficient [10][11][12][13]. This is because the body of a portable device equipped with directional microphones acts as wall reflection in a recording, which is referred to as shadowed directivity [10].…”

Section: Introductionmentioning

confidence: 99%

“…However, when the audio signals captured by these recording techniques are reproduced, the stereophonic images often do not feel sufficient [10][11][12][13]. This is because the body of a portable device equipped with directional microphones acts as wall reflection in a recording, which is referred to as shadowed directivity [10]. As an alternative, a spaced recording technique can be applied to capture stereo audio from such portable devices [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Frequency-Dependent Amplitude Panning for the Stereophonic Image Enhancement of Audio Recorded Using Two Closely Spaced Microphones

Chun

Kim

2016

Applied Sciences

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Abstract:In this paper, we propose a new frequency-dependent amplitude panning method for stereophonic image enhancement applied to a sound source recorded using two closely spaced omni-directional microphones. The ability to detect the direction of such a sound source is limited due to weak spatial information, such as the inter-channel time difference (ICTD) and inter-channel level difference (ICLD). Moreover, when sound sources are recorded in a convolutive or a real room environment, the detection of sources is affected by reverberation effects. Thus, the proposed method first tries to estimate the source direction depending on the frequency using azimuth-frequency analysis. Then, a frequency-dependent amplitude panning technique is proposed to enhance the stereophonic image by modifying the stereophonic law of sines. To demonstrate the effectiveness of the proposed method, we compare its performance with that of a conventional method based on the beamforming technique in terms of directivity pattern, perceived direction, and quality degradation under three different recording conditions (anechoic, convolutive, and real reverberant). The comparison shows that the proposed method gives us better stereophonic images in a stereo loudspeaker reproduction than the conventional method without any annoying effects.

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“…In addition, a radiosity-based theoretical model developed for the evaluation of the sound field behind pairs of diffusive noise barriers was described, and its ability to predict the extra SPL attenuation deriving from the replacement of geometrically reflecting barriers with diffusely reflecting barriers was verified. Investigations were carried out to study the shadowing effect of barriers of infinite or finite length in the presence of directional noise sources (Menounou and Papaefthymiou 2010).…”

Section: Introductionmentioning

confidence: 99%

Optimized height of noise barrier for non-urban highway using artificial neural network

Kumar

Parida

Katiyar

2013

Int. J. Environ. Sci. Technol.

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This study applies artificial neural network (ANN) for the determination of optimized height of a highway noise barrier. Field measurements were carried out to collect traffic volume, vehicle speed, noise level, and site geometry data. Barrier height was varied from 2 to 5 m in increments of 0.1 m for each measured data set to generate theoretical data for network design. Barrier attenuation was calculated for each height increment using Federal Highway Administration model. For neural network design purpose, classified traffic volume, corresponding traffic speed, and barrier attenuation data have been taken as input parameters, while barrier height was considered as output. ANNs with different architectures were trained, cross validated, and tested using this theoretical data. Results indicate that ANN can be useful to determine the height of noise barrier accurately, which can effectively achieve the desired noise level reduction, for a given set of traffic volume, vehicular speed, highway geometry, and site conditions.

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Shadowing of directional noise sources by finite noise barriers

Cited by 14 publications

References 33 publications

Investigation of the efficiency of a noise protection screen with an opening at its base

Investigation of the efficiency of a noise protection screen with an opening at its base

Frequency-Dependent Amplitude Panning for the Stereophonic Image Enhancement of Audio Recorded Using Two Closely Spaced Microphones

Optimized height of noise barrier for non-urban highway using artificial neural network

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