Exterior-Interior 3D Sound Field Separation Using a Planar Array of Differential Microphones

Zuo, Huanyu; Samarasinghe, Prasanga N.; Abhayapala, Thushara D.

doi:10.1109/iwaenc.2018.8521377

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…denoting spherical harmonic coefficients of desired sound intensity in r direction, where C nn p = (2n + 1)(2n + 1)(2p + 1)/4π, j n (•) is the n th order spherical Bessel function of the first kind, j n (•) is the derivative of j n (•) in terms of r, ρ 0 is medium density, N = keR/2 is the truncation limit of the soundfield orders [24],…”

Section: A Desired Sound Intensitymentioning

confidence: 99%

Intensity Based Soundfield Reproduction over Multiple Sweet Spots Using an Irregular Loudspeaker Array

Zuo

Samarasinghe

Abhayapala

2021

2020 28th European Signal Processing Conference (EUSIPCO)

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Intensity based soundfield reproduction methods are shown to provide impressive human perception of sound localization. However, most of the previous works in this domain either focus on a single sweet spot for the listener, or are constrained to a regular loudspeaker geometry, which is difficult to implement in real-world applications. This paper addresses both of the above challenges. We propose an intensity matching technique to optimally reproduce sound intensity at multiple sweet spots using an irregular loudspeaker array. The performance of the proposed method is evaluated by comparing it with the pressure and velocity matching method through numerical simulations and perceptual experiments. The results show that the proposed method has an improved performance.

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Section: A Desired Sound Intensitymentioning

confidence: 99%

Intensity Based Soundfield Reproduction over Multiple Sweet Spots Using an Irregular Loudspeaker Array

Zuo

Samarasinghe

Abhayapala

2021

2020 28th European Signal Processing Conference (EUSIPCO)

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“…where N = keR/2 is the truncation limit of the soundfield orders [37], R is the radius of the sperical region, e is the base of natural logarithm, k = 2πf /c is the wave number, f is the frequency, c is the speed of propagation, α nm (k) denotes spherical harmonic coefficients of the desired sound pressure, j n (•) is the n th order spherical Bessel function of the first kind, and Y nm (θ, φ) is the spherical harmonic of order n and degree m.…”

Section: Review Of Pressure Matching In the Spherical Harmonic Domainmentioning

confidence: 99%

Intensity Based Spatial Soundfield Reproduction Using an Irregular Loudspeaker Array

Zuo

Samarasinghe

Abhayapala

2020

IEEE/ACM Trans. Audio Speech Lang. Process.

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Sound intensity is an acoustic quantity closely linked with human perception of sound location, and it can be controlled to create a high level of realism to humans in soundfield reproduction systems. In this paper, we present an intensity matching technique to optimally reproduce sound intensity over a continuous spatial region using an irregular loudspeaker array. This avoids several known limitations in the previous works on intensity based soundfield reproduction, such as a single sweet spot for the listener and a regular loudspeaker geometry that is difficult to implement in real-world applications. In contrast to the previous works, the new technique uses a cost function we built to optimize sound intensity over space by exploiting spatial sound intensity distributions. The spatial sound intensity distribution is represented by spherical harmonic coefficients of sound pressure, which are widely used to describe a spatial soundfield. Compared to the conventional spatial soundfield reproduction method of pressure matching in the spherical harmonic domain and the HOA max-rE decoding method optimizing sound intensity at a single position, we show that the intensity matching technique has better overall performance with two different irregular loudspeaker layouts through simulations. The impact of microphone noise on reproduction performance is also assessed. Finally, we carry out perceptual localization experiments to validate the proposed method.

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“…To solve this problem, this paper proposes an alternative residual-based close-talking approach using microphones in a planar distribution. In the proposed method, the sound pressure at the center of the array is also interpolated using sound pressures recorded by multiple co-centered circular microphone arrays via multiple 2D cylindrical harmonic analyses [19][20][21]. If the sound sources are located outside the spherical boundary formed by the maximum radius of the arrays, the interpolation is completed.…”

Section: Introductionmentioning

confidence: 99%

Close-Talking Recording with Planarly Distributed Microphones

Okamoto

2021

ICASSP 2021 - 2021 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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This paper provides a close-talking recording method with microphones in arbitrary planar distributions based on sound pressure interpolation. In this method, sound pressures recorded by microphones located near the center of multiple co-centered circular microphone arrays are interpolated using sound pressures recorded by these arrays via multiple 2D cylindrical harmonic analyses. If the sound sources are outside the spherical boundary formed by the maximum radius of the arrays, the interpolation is completed. However, if the sound sources are inside the spherical boundary, the interpolation is not completed in principle. Using this principle, close-talking recording is realized as a residual response between recorded and interpolated sound pressures. The recording radial sensitivity can be controlled by varying the maximum array radius. By introducing a kernel ridge regression-based sound field interpolation method, the approach can be extended to the microphones in arbitrary planar distributions. Simulations confirm the effectiveness of these closetalking recording methods.

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Exterior-Interior 3D Sound Field Separation Using a Planar Array of Differential Microphones

Cited by 7 publications

References 20 publications

Intensity Based Soundfield Reproduction over Multiple Sweet Spots Using an Irregular Loudspeaker Array

Intensity Based Soundfield Reproduction over Multiple Sweet Spots Using an Irregular Loudspeaker Array

Intensity Based Spatial Soundfield Reproduction Using an Irregular Loudspeaker Array

Close-Talking Recording with Planarly Distributed Microphones

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