Directivity Synthesis with Multipoles Comprising a Cluster of Focused Sources Using a Linear Loudspeaker Array

Tsutsumi, Kimitaka; Hori, Yoichi; Noguchil, Ken'ichi; Takada, Hideaki

doi:10.1109/icassp.2018.8461710

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…Researchers have been investigating methods to reproduce sound fields of directional sound sources for some time. Among them are a method that captures the sound field as a whole by using a microphone array [8], a method based on driving functions analytically derived from an angular spectrum [9], an analytical method derived from circular harmonics [10][11][12][13], and a method based on multipole superposition [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Multipole-based methods have been presented in existing researches [14,15]. [15] presented an analytical method of obtaining weighting coefficients for each multipole.…”

Section: Introductionmentioning

confidence: 99%

“…Multipole-based methods have been presented in existing researches [14,15]. [15] presented an analytical method of obtaining weighting coefficients for each multipole. Although directivity patterns were reproduced by the method, the phase of the original directional sound source was not reproduced; therefore, the sound field was degraded.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, we focused on creating the sound field of a directional sound source in the listening area of a focused source in 2D space. In contrast to an existing method [15], our method can reproduce both directivity patterns and phases of the target sound field to reproduce an accurate sound field.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Sound field synthesis based on superposition of multipoles comprising focused monopole sources

Tsutsumi

Imaizumi

Hori

et al. 2020

Acoust. Sci. & Tech.

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We propose a method to create a directional sound source in front of a linear loudspeaker array. The method creates clusters of focused sources to form multipoles by using a linear loudspeaker array and superposes the multipoles to synthesize a directivity pattern. We also derive an efficient multipole structure in which adjacent lower order multipoles are overlapped. The structure reduces the number of focused sources, thereby reducing the algorithmic complexity needed to create them. To further reduce complexity, we also derive a time domain implementation of the proposed method. To mitigate degradation in the reproduced directivity due to superposition of the inaccurate sound fields of focused sources, a fractional delay interpolation is applied. Computer simulation results indicate that the proposed method based on superposition of up to the third order multipoles creates a directional sound source at significantly lower complexity than a conventional method.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Multipole-based methods have been presented in existing researches [14,15]. [15] presented an analytical method of obtaining weighting coefficients for each multipole.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sound field synthesis based on superposition of multipoles comprising focused monopole sources

Tsutsumi

Imaizumi

Hori

et al. 2020

Acoust. Sci. & Tech.

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Analytical Method of 2.5d Exterior Sound Field Synthesis By Using Multipole Loudspeaker Array

Imaizumi

Tsutsumi

Nakadaira

et al. 2019

2019 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics (WASPAA)

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On the efficient modeling of generic source directivity in Gaussian beam tracing

Bian

Fattah

Zhong

et al. 2021

The Journal of the Acoustical Society of America

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For large-distance sound propagation with complex obstacles, the Gaussian beam tracing (GBT) method is often applied. An omnidirectional source model is commonly implemented in GBT, which, however, neglects the influence of generic directivity patterns of practical acoustic problems. There have been efforts to synthesize or reproduce the target directivity pattern over an observation surface by using multiple distributed point sources. However, the efficiency and applicability of general applications still call for improvement. More specifically, rays from each of the point sources and their traces in the space should be computed and superposed to estimate the sound field, making the computational cost largely dependent on the complexity of the source directivity pattern. In this work, a complex-valued radiation function model is developed to realize the generic source directivity for GBT computation. One advantage of the method is that only one source is required such that computation cost can be greatly reduced. Rays are emitted from the source with direction-dependent amplitude and phase to realize the target directivity pattern. The development of the radiation function is associated with the GBT method. The verification cases show that this method can give good agreement with analytical or wave-based numerical solutions. Capabilities of modeling a complex source model of the spinning sound field to mimic the propeller noise are studied, and the result matches well with analytical solutions. Finally, a demonstration case of a four-propeller-powered drone in an urban region is conducted.

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Directivity Synthesis with Multipoles Comprising a Cluster of Focused Sources Using a Linear Loudspeaker Array

Cited by 4 publications

References 7 publications

Sound field synthesis based on superposition of multipoles comprising focused monopole sources

Sound field synthesis based on superposition of multipoles comprising focused monopole sources

Analytical Method of 2.5d Exterior Sound Field Synthesis By Using Multipole Loudspeaker Array

On the efficient modeling of generic source directivity in Gaussian beam tracing

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