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Spherical correlation as a similarity measure for 3-D radiation patterns of musical instruments 球形相关作为乐器三维辐射模式的相似度量
IF 1.4 3区 物理与天体物理 Q2 Health Professions Pub Date : 2023-01-01 DOI: 10.1051/aacus/2023033
Thibaut Carpentier, A. Einbond
We investigate the use of spherical cross-correlation as a similarity measure of sound radiation patterns, with potential applications for their study, organization, and manipulation. This work is motivated by the application of corpus-based synthesis techniques to spatial projection based on the radiation patterns of orchestral instruments. To this end, we wish to derive spatial descriptors to complement other audio features available for the organization of the sample corpus. Considering two directivity functions on the sphere, their spherical correlation can be computed from their spherical harmonic coefficients. In addition, one can search for the 3-D rotation matrix which maximizes the cross-correlation, i.e. which offers the optimal spherical shape matching. The mathematical foundations of these tools are well established in the literature; however, their practical use in the field of acoustics remains relatively limited and challenging. As a proof of concept, we apply these techniques both to simulated radiation data and to measurements derived from an existing database of 3-D directivity patterns of orchestral instruments. Using these examples we present several test cases to compare the results of spherical correlation to mathematical and acoustical expectations. A range of visualization methods are applied to analyze the test cases, including multi-dimensional scaling, employed as an efficient technique for data reduction and navigation. This article is an extended version of a study previously published in [Carpentier and Einbond. 16th Congrès Français d’Acoustique (CFA), Marseille, France, April 2022, pp. 1–6. https://openaccess.city.ac.uk/id/eprint/28202/].
我们研究了使用球形互相关作为声辐射模式的相似性度量,以及它们的研究、组织和操作的潜在应用。这项工作的动机是将基于语料库的合成技术应用于基于管弦乐乐器辐射模式的空间投影。为此,我们希望派生空间描述符来补充样本语料库组织可用的其他音频特征。考虑球面上的两个指向性函数,可以通过它们的球谐系数计算它们的球相关关系。此外,还可以搜索使相互关系最大化的三维旋转矩阵,即提供最佳球形匹配的三维旋转矩阵。这些工具的数学基础在文献中得到了很好的确立;然而,它们在声学领域的实际应用仍然相对有限和具有挑战性。作为概念的证明,我们将这些技术应用于模拟辐射数据和从管弦乐器的三维指向性模式的现有数据库中获得的测量。使用这些例子,我们提出了几个测试案例,以比较球形相关结果与数学和声学期望。应用了一系列可视化方法来分析测试用例,包括多维缩放,作为一种有效的数据简化和导航技术。本文是先前发表在[Carpentier and Einbond] .第16届法国声学大会(CFA),马赛,法国,2022年4月,第1-6页上的一项研究的扩展版本。https://openaccess.city.ac.uk/id/eprint/28202/]。
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引用次数: 2
Survey method for field measurement of rubber ball impact sound in reinforced concrete apartment houses in Korea – Based on the Korean measurement method 韩国钢筋混凝土住宅橡胶球冲击声现场测量方法-以韩国测量方法为基础
IF 1.4 3区 物理与天体物理 Q2 Health Professions Pub Date : 2023-01-01 DOI: 10.1051/aacus/2023023
Jeongho Jeong, J. Ryu
The rubber ball impact sound has been standardized by ISO 10140 series and ISO 16283-2 for laboratory and field measurements, respectively. The ISO 10052 standard specifies a survey method for the impact sound measurement using a tapping machine and a rubber ball. This study proposed measurement position for the survey method which is highly correlated with result based on the Korean Standards (KS) and the building regulation of South Korea for engineering method. The rubber ball impact sounds were measured in 79 reinforced concrete apartment houses, which have a centre point and four perimeter points for both exciting and receiving sounds. The proposed survey method was validated for only a specific type of apartment building layout and construction in the South Korean environment. The excitation and receiving points in the perimeter having the most similar characteristics to the results obtained using the Korean engineering methods were first selected. By combining the selected perimeter point and centre point for both the excitation and receiving sounds, the characteristics of each combination were compared with the results obtained using the Korean engineering method. When one excitation point or receiving point in the perimeter was added to the centre point for the proposed survey method, the difference between the measurement result using the engineering and proposed survey method decreased. The standard deviation of the difference between the SNQs of the proposed survey method and the Korean engineering method for measuring the rubber ball impact sound was smaller than 2 dB.
橡胶球撞击声已分别通过ISO 10140系列和ISO 16283-2标准,用于实验室和现场测量。ISO 10052标准规定了用攻丝机和橡胶球测量冲击声的测量方法。本研究根据韩国标准(KS)和韩国建筑规范的工程方法,提出了与结果高度相关的测量方法的测量位置。橡胶球撞击的声音在79个钢筋混凝土公寓中进行了测量,这些公寓有一个中心点和四个外围点,分别用于激发和接收声音。所提出的调查方法仅针对韩国环境中特定类型的公寓建筑布局和建筑进行了验证。首先选取与韩国工程方法得到的结果特征最相似的周长激励点和接收点。通过结合选定的激发声和接收声的周长点和中心点,将每个组合的特征与使用韩国工程方法获得的结果进行比较。当在建议的测量方法的中心点上增加一个周长的激励点或接收点时,工程测量结果与建议的测量方法之间的差异减小。所提出的测量方法的snq与韩国工程方法测量橡胶球冲击声的标准偏差小于2 dB。
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引用次数: 0
Brownian motion with radioactive decay to calculate the dynamic bulk modulus of gases saturating porous media according to Biot theory 用放射性衰变布朗运动,根据Biot理论计算饱和多孔介质气体的动态体积模量
3区 物理与天体物理 Q2 Health Professions Pub Date : 2023-01-01 DOI: 10.1051/aacus/2023034
Denis Lafarge, Navid Nemati, Stéphane Vielpeau
We present a new stochastic simulation method for determining the long-wavelength effective dynamic bulk modulus of gases, such as ambient air, saturating porous media with relatively arbitrary microgeometries, i.e., simple enough to warrant Biot’s simplification that the fluid and solid motions are quasi-incompressible motions at the pore scale. The simulation method is based on the mathematical isomorphism between two different physical problems. One of them is the actual Fourier heat exchange problem between gas and solid in the context of Biot theory. The other is a diffusion-disintegration-controlled problem that considers Brownian motion of diffusing particles undergoing radioactive-type decay in the pore volume and instant decay at the pore walls. By appropriately choosing the decay time and the diffusion coefficient, the stochastic algorithm we develop to determine the average lifetime of the diffusing particles, directly gives the effective apparent modulus of the saturating fluid. We show how it leads to purely geometric stochastic constructions to determine a number of geometrical parameters. After validating the algorithm for cylindrical circular pores, its power is illustrated for the case of fibrous materials of the type used in noise control. The results agree well with a model of the effective modulus with three purely geometric parameters of the pore space: static thermal permeability divided by porosity, static thermal tortuosity, and thermal characteristic length.
我们提出了一种新的随机模拟方法来确定气体的长波有效动态体积模量,例如环境空气,饱和多孔介质具有相对任意的微观几何形状,即简单到足以保证Biot的简化,即流体和固体运动在孔隙尺度上是准不可压缩运动。该仿真方法基于两个不同物理问题之间的数学同构。其中之一是在生物理论背景下的气体和固体之间的傅里叶热交换问题。另一类是扩散-分解控制问题,考虑扩散粒子在孔隙体积中发生放射性衰变和孔壁瞬间衰变的布朗运动。通过适当选择衰减时间和扩散系数,提出了确定扩散粒子平均寿命的随机算法,直接给出了饱和流体的有效表观模量。我们展示了它如何导致纯几何随机结构来确定一些几何参数。在验证了该算法对圆柱形圆孔的影响后,说明了该算法对用于噪声控制的纤维材料的有效性。结果与含孔隙空间三个纯几何参数的有效模量模型吻合良好:静态热渗透率除以孔隙度、静态热弯曲度和热特征长度。
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引用次数: 0
Quantification of amplitude modulation of wind turbine emissions from acoustic and ground motion recordings 从声学和地面运动记录中量化风力涡轮机排放的振幅调制
3区 物理与天体物理 Q2 Health Professions Pub Date : 2023-01-01 DOI: 10.1051/aacus/2023047
Esther Blumendeller, Laura Gaßner, Florian J.Y. Müller, Johannes Pohl, Gundula Hübner, Joachim Ritter, Po Wen Cheng
Amplitude modulation (AM) is a common phenomenon associated with wind turbine (WT) related noise annoyance. Within the interdisciplinary project Inter-Wind, acoustic, ground motion, and meteorological data are captured to be evaluated with noise reports of residents living near a wind farm in Southern Germany. The recorded data builds a solid data base for the evaluation of AM. The occurrence of AM is detected within acoustic and ground motion data and set in relation to all available data, including WT operational parameters, meteorology, and noise reports. In this study, the origins of detected AM are tones at 57.8 Hz and 133 Hz, related to the generator and drive train, which are amplitude modulated by the blade passing frequency. AM detection was successful both with acoustic as well as ground motion data. A comparison of a method for AM detection developed by the Institute of Acoustics (IOA reference method) with a method specifically developed to detect AM in ground motion data showed that the reference method detected AM three to six times more often than the newly developed method. AM occurred most likely during stable atmospheric conditions, with a positive lapse rate, and was (albeit to a small degree) more likely to be detected when residents reported higher levels of annoyance.
调幅(AM)是与风力发电机组(WT)相关的噪声干扰相关的一种常见现象。在Inter-Wind跨学科项目中,声学、地面运动和气象数据被捕获,并与居住在德国南部风电场附近的居民的噪音报告进行评估。记录的数据为AM的评价建立了坚实的数据基础。AM的出现是在声学和地面运动数据中检测到的,并与所有可用数据(包括WT操作参数、气象和噪声报告)相关。在本研究中,检测到的调幅源是57.8 Hz和133 Hz的音调,与发电机和传动系有关,它们是由叶片通过频率调幅的。调幅探测在声学和地面运动数据方面都取得了成功。声学研究所开发的调幅检测方法(IOA参考方法)与专门开发的地动数据调幅检测方法的比较表明,参考方法检测调幅的频率是新开发方法的三到六倍。AM最有可能发生在稳定的大气条件下,具有正的递减率,并且在居民报告更高程度的烦恼时更有可能被检测到(尽管程度很小)。
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引用次数: 0
Theory of continuously curved and phased line sources for sound reinforcement 用于扩声的连续弯曲相控线源理论
3区 物理与天体物理 Q2 Health Professions Pub Date : 2023-01-01 DOI: 10.1051/aacus/2023045
Lukas Gölles, Franz Zotter
To supply large audience areas uniformly with amplified direct sound, large-scale sound reinforcement often employs line-source loudspeaker arrays adapted to the listening area by either adjusting the angles or delays between their individual elements. This paper proposes a model for such or smaller line-source loudspeakers based on a delayed Green’s function integrated over an unknown contour. For a broad frequency range, stationary phase approximation yields a differential equation that we utilize to find a curve and delay progression providing direct sound levels rolling off with −6 β dB per doubling of the distance; curve and phase designs can also be mixed to meet simultaneous targets using multiple design parameters β . The effectiveness of the formalism is proven by simulations of coverage, directivity, and discretization artifacts. Measurements on a miniature line array prototype that targets medium-scale immersive sound reinforcement applications verify the proposed theory for curvature, delay, and mixed designs.
为了均匀地向广大听众区域提供放大的直接声音,大规模扩声通常采用线源扬声器阵列,通过调整各个元件之间的角度或延迟来适应收听区域。本文提出了一种基于在未知轮廓上集成延迟格林函数的此类或较小线源扬声器模型。对于较宽的频率范围,定相近似产生一个微分方程,我们利用它来找到一条曲线和延迟级数,提供每增加一倍距离以- 6 β dB滚动的直接声级;曲线和相位设计也可以混合使用多个设计参数β来满足同时的目标。通过对覆盖、指向性和离散化伪影的模拟,证明了这种形式的有效性。针对中等规模沉浸式扩声应用的微型线阵列原型的测量验证了曲率、延迟和混合设计的理论。
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引用次数: 0
Investigation of the influence of the torso, lips and vocal tract configuration on speech directivity using measurements from a custom head and torso simulator 使用定制头部和躯干模拟器测量躯干、嘴唇和声道结构对言语指向性的影响
IF 1.4 3区 物理与天体物理 Q2 Health Professions Pub Date : 2023-01-01 DOI: 10.1051/aacus/2023035
R. Blandin, Jingyan Geng, P. Birkholz
The human voice is a directional sound source. This property has been explored for more than 200 years, mainly using measurements of human participants. Some efforts have been made to understand the anatomical parameters that influence speech directivity, e.g., the mouth opening, diffraction and reflections due to the head and torso, the lips and the vocal tract. However, these parameters have mostly been studied separately, without being integrated into a complete model or replica. The aim of this work was to study the combined influence of the torso, the lips and the vocal tract geometry on speech directivity. For this purpose, a simplified head and torso simulator was built; this simulator made it possible to vary these parameters independently. It consisted of two spheres representing the head and the torso into which vocal tract replicas with or without lips could be inserted. The directivity patterns were measured in an anechoic room with a turntable and a microphone that could be placed at different angular positions. Different effects such as torso diffraction and reflections, the correlation of the mouth dimensions with directionality, the higher-order modes and the increase in directionality due to the lips were confirmed and further documented. Interactions between the different parameters were found. It was observed that torso diffraction and reflections were enhanced by the presence of the lips, that they could be modified or masked by the effect of higher-order modes and that the lips tend to attenuate the effect of higher-order modes.
人的声音是一种定向声源。这一特性已经被探索了200多年,主要是通过对人类参与者的测量。已经做出了一些努力来了解影响言语指向性的解剖学参数,例如,张嘴、衍射和由头部和躯干、嘴唇和声道引起的反射。然而,这些参数大多是单独研究的,没有集成到一个完整的模型或复制品中。这项工作的目的是研究躯干,嘴唇和声道几何形状对言语指向性的综合影响。为此,建立了一个简化的头部和躯干模拟器;这个模拟器使独立地改变这些参数成为可能。它由代表头部和躯干的两个球体组成,有嘴唇或没有嘴唇的声道复制品可以插入其中。指向性模式是在一个带有转盘和麦克风的消声室中测量的,麦克风可以放置在不同的角度位置。不同的影响,如躯干衍射和反射,嘴巴尺寸与方向性的相关性,高阶模式和方向性增加由于嘴唇被证实并进一步记录。发现了不同参数之间的相互作用。观察到,躯干衍射和反射由于嘴唇的存在而增强,它们可以被高阶模式的影响修改或掩盖,并且嘴唇倾向于衰减高阶模式的影响。
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引用次数: 0
Diversity of ghost notes in tubas, euphoniums and saxhorns 大号、小号和萨克斯管中鬼音的多样性
IF 1.4 3区 物理与天体物理 Q2 Health Professions Pub Date : 2022-07-12 DOI: 10.1051/aacus/2022026
R'emi Matt'eoli, J. Gilbert, S. Terrien, J. Dalmont, C. Vergez, S. Maugeais, E. Brasseur
The ghost note is a natural note which can be played exclusively on bass brass instruments with a predominantly-expanding bore profile such as tubas, euphoniums or saxhorns. It stands between the pedal note – the lowest natural note playable, or first regime – and the instrument’s second regime. However, if the interval between the pedal note and the second regime remains close to an octave regardless of the instrument, the interval between the pedal note and the ghost note vary from a minor third to a perfect fourth. References about this note are very scarce, and it is not commonly known among tuba players. This study shows that an elementary brass model describing the player coupled to the instrument is capable of bringing both the ghost and the pedal note to light. Here, we adopt a dynamical systems point of view and perform a bifurcation analysis using a software of numerical continuation. The numerical results provided in terms of frequency intervals between pedal note and ghost note are compared with frequency intervals experimentally inferred from recordings of seven different types of tuba, each of them being played by two professional tuba players.
鬼音是一种自然的音符,可以在低音铜管乐器上演奏,主要是扩大口径,如大号,低音管或萨克斯管。它站在踏板音符-最低的自然音符可演奏,或第一政权-和乐器的第二政权之间。然而,如果踏板音和第二音调之间的间隔保持接近一个八度,而不管乐器是什么,踏板音和鬼音之间的间隔从小三度到完美四度不等。关于这个音符的参考文献非常少,而且在大号演奏者中并不常见。这项研究表明,一个基本的铜管模型描述的玩家耦合到乐器能够带来幽灵和踏板的注意到光。本文采用动力系统的观点,利用数值延拓软件进行分岔分析。将踏板音和鬼音之间的频率间隔的数值结果与7种不同类型大号录音中实验推断的频率间隔进行了比较,每种大号由两名专业大号演奏家演奏。
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引用次数: 1
Shielding of rotor noise by plates and wings 板和翼对旋翼噪声的屏蔽
IF 1.4 3区 物理与天体物理 Q2 Health Professions Pub Date : 2022-02-28 DOI: 10.1051/aacus/2022022
M. Carley
A method of noise reduction proposed for the next generation of aircraft is to shield noise from the propulsion system, by positioning the noise source over a wing or another surface. In this paper, an approximate analysis is developed for the acoustic field far from a circular source placed near the edge of a semi-infinite plate, a model problem for shielding of noise by a wing and for scattering by a trailing edge. The approximation is developed for a source of small radius and is found to be accurate when compared to full numerical evaluation of the field.
为下一代飞机提出的一种降噪方法是通过将噪声源置于机翼或其他表面来屏蔽推进系统的噪声。本文对半无限平板边缘附近远离圆形声源的声场、机翼遮挡噪声和后缘散射的模型问题进行了近似分析。该近似是针对小半径源而开发的,与对该场的完整数值评估相比,发现它是准确的。
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引用次数: 0
AMT 1.x: A toolbox for reproducible research in auditory modeling AMT 1。x:听觉建模可重复性研究的工具箱
IF 1.4 3区 物理与天体物理 Q2 Health Professions Pub Date : 2022-01-01 DOI: 10.1051/aacus/2022011
P. Majdak, Clara Hollomey, Robert Baumgartner
The Auditory Modeling Toolbox (AMT) is a MATLAB/Octave toolbox for the development and application of computational auditory models with a particular focus on binaural hearing. The AMT aims for a consistent implementation of auditory models, well-structured in-code documentation, and inclusion of auditory data required to run the models. The motivation is to provide a toolbox able to reproduce the model predictions and allowing students and researchers to work with and to advance existing models. In the AMT, model implementations can be evaluated in two stages: by running so-called demonstrations, which are quick presentations of a model, and by starting so-called experiments aimed at reproducing results from the corresponding publications. Here, we describe the tools and mechanisms available within the framework of all AMT 1.x versions. The recently released AMT 1.1 includes over 60 models and is freely available as an open-source package from https://www.amtoolbox.org.
听觉建模工具箱(AMT)是一个MATLAB/Octave工具箱,用于开发和应用计算听觉模型,特别关注双耳听力。AMT的目标是听觉模型的一致实现,结构良好的代码内文档,以及运行模型所需的听觉数据的包含。其动机是提供一个能够重现模型预测的工具箱,并允许学生和研究人员使用和改进现有模型。在AMT中,模型实现可以分两个阶段进行评估:通过运行所谓的演示,这是模型的快速演示,以及通过启动所谓的实验,旨在从相应的出版物中复制结果。在这里,我们描述了所有AMT 1框架内可用的工具和机制。x版本。最近发布的AMT 1.1包括60多个模型,可以从https://www.amtoolbox.org免费获得开源包。
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引用次数: 34
Effect of slit length on linear and non-linear acoustic transfer impedance of a micro-slit plate 狭缝长度对微狭缝板线性和非线性声传递阻抗的影响
IF 1.4 3区 物理与天体物理 Q2 Health Professions Pub Date : 2022-01-01 DOI: 10.1051/aacus/2021059
Alessia Aulitto, A. Hirschberg, I. L. Arteaga, Esmée L.R.H. Buijssen
The effect of the slit length on the acoustic transfer impedance of micro-slit plates (MSPs) is investigated in the linear and non-linear regime for a specific slit geometry. This geometry is inspired by slits obtained by cutting and bending the plate. MSPs are plates with arrays of slit-shaped perforations, with the width of the order of the acoustic viscous boundary layer thickness. Impedance tube measurements on two accurately manufactured plates are compared to numerical solution of the Linearized Navier-Stokes equations and to analytical limits. The impedance of the plate is obtained by the impedance of a single slit divided by the plate porosity. The resistance of a slit is independent on the slit length and on the plate porosity. In the linear regime the resistance is accurately predicted by a two-dimensional numerical model. In the non-linear regime, the resistance is strongly dependent on the amplitude of the acoustic waves. The inertance of the slit is weakly dependent on the slit length and on the plate porosity, for low and moderate amplitudes. For high amplitudes, a complicated amplitude dependency of the inertia of short slits is found. One expects that most of the conclusions obtained can be generalised to other slit geometries.
在特定狭缝几何条件下,研究了狭缝长度对微狭缝板声传递阻抗的影响。这种几何形状的灵感来自于通过切割和弯曲钢板而获得的狭缝。MSPs是具有狭缝状穿孔阵列的板,其宽度与声粘性边界层厚度的数量级相当。在两个精确制造的板上的阻抗管测量与线性化Navier-Stokes方程的数值解和解析极限进行了比较。板的阻抗由单狭缝的阻抗除以板的孔隙率得到。狭缝的阻力与狭缝长度和板的孔隙率无关。在线性状态下,用二维数值模型精确地预测了电阻。在非线性状态下,阻力强烈依赖于声波的振幅。对于低振幅和中等振幅,狭缝的惯性对狭缝长度和板孔隙率的依赖性较弱。对于高幅值,发现了短缝惯性与幅值的复杂关系。人们期望得到的大多数结论可以推广到其他狭缝几何。
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引用次数: 5
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