Optimal Microphone Placement for Single-Channel Sound-Power Spectrum Estimation and Reverberation Effects

Bellows, Samuel D.; Leishman, Timothy W.

doi:10.17743/jaes.2022.0052

Cited by 3 publications

(2 citation statements)

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“…However, when measurement constraints lead to unsampled regions, such as below the talker's legs, a least-squares fit may lead to spurious radiation lobes in this region. Applying incorrect directional data to applications such as geometrical acoustics modeling [16] or determining optimized microphone placements [17] can lead to incorrect results. Regularized least-squares fits have been employed to handle this so-called "polar gap" problem.…”

Section: Introductionmentioning

confidence: 99%

Combining multiple sparse measurements with reference data regularization to create spherical directivities applied to voice data

Bellows,

Katz

2024

Acta Acust.

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Obtaining high-resolution, spherical phoneme-dependent directivities for voice radiation is beneficial for numerous acoustics applications. This work reports on a spherical interpolation method based on two interleaved measurements using a regularized least-squares fit with reference data. Maximizing the spherical correlation between previously reported results and measured data determines the regularization hyper-parameters to ensure physical solutions. While the resultant spherical directivity patterns show similarities to time-averaged results, distinct radiation characteristics appear, particularly in the range of 630 Hz to 2 kHz.

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Section: Introductionmentioning

confidence: 99%

Combining multiple sparse measurements with reference data regularization to create spherical directivities applied to voice data

Bellows,

Katz

2024

Acta Acust.

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“…Acoustic directivity measurements are essential tools for establishing the radiation patterns of sources. Their data have applications in room acoustical design [1,2], auralizations [3,4], microphone placements [5][6][7], sound source modeling [8,9], and other areas. Despite the significance of these data, the number of discrete sampling positions employed for published measurements has varied dramatically from fewer than a hundred [10][11][12][13] to well over a thousand [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

A Spherical-Harmonic-Based Framework for Spatial Sampling Considerations of Musical Instrument and Voice Directivity Measurements

Bellows,

Leishman

2022

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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Researchers have employed numerous array configurations and sampling densities to thoroughly measure the sound radiations of live sources, such as musical instruments and speech. The number of sampling positions has varied from fewer than a hundred to over a thousand, with measurement inconsistencies highlighting a knowledge gap in the number of sampling positions required for spherical directivity measurements. This work presents theoretical methods and practical metrics to assess the required number of sampling positions for a given source to mitigate spatial aliasing. Theoretical developments show that the number of necessary sampling positions closely relates to source geometry due to the spatial filtering effects of far-field propagation. Initial results from theoretical models generalize the approach to live sources.

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Directional characteristics of two gamelan gongs

Bellows,

Harwood,

Gee

et al. 2023

The Journal of the Acoustical Society of America

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The distinctive geometry and structural characteristics of Balinese gamelan gongs lead to the instrument's unique sound and musical style. This work presents high-resolution directivity measurements of two types of gamelan gongs to quantify and better understand their acoustic behavior. The measured instruments' structural modes clearly impact their far-field directivity patterns, with the number of directional lobes corresponding to the associated structural mode shapes. Many of the lowest modes produce dipole-like radiation, with the dipole moment determined by the positions of the nodal and antinodal regions. Higher modes exhibit more complex patterns with multiple lobes often correlated with the location and number of antinodal regions on the gong's edge. Directivity indices correspond to dipole radiation at low frequencies and quadrupole radiation at intermediate and higher frequencies. Symmetry analysis confirms that the gong's rim significantly impacts the resultant directivity.

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Optimal Microphone Placement for Single-Channel Sound-Power Spectrum Estimation and Reverberation Effects

Cited by 3 publications

References 0 publications

Combining multiple sparse measurements with reference data regularization to create spherical directivities applied to voice data

Combining multiple sparse measurements with reference data regularization to create spherical directivities applied to voice data

A Spherical-Harmonic-Based Framework for Spatial Sampling Considerations of Musical Instrument and Voice Directivity Measurements

Directional characteristics of two gamelan gongs

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