{"title":"Source separation and direction-of-arrival estimation for signals overlapping in time and frequency with a single acoustic vector sensor.","authors":"Alison B Laferriere, Aaron M Thode","doi":"10.1121/10.0046765","DOIUrl":"https://doi.org/10.1121/10.0046765","url":null,"abstract":"<p><p>A single acoustic vector sensor directly measures acoustic field directionality, but separating arrivals that overlap in time and frequency remains challenging. Beamforming, covariance-based direction finding, and statistical source-separation methods can be effective when sufficient spatial, temporal, spectral, or statistical diversity is available. However, coherent or transient components occupying the same time-frequency bins present a more difficult separation problem. Here, a physics-based method is introduced showing that a single vector sensor can recover the arrival angles, amplitudes, and relative phase of two overlapping plane waves at the same frequency. The approach exploits reactive intensity generated by interference between the waves, which is oriented perpendicular to the bisector of their wavevectors. This geometry defines a natural coordinate system leading to closed-form analytic solutions for source separation and direction-of-arrival estimation. Simulations illustrate separation of correlated signals, such as coherent multipath, while sensitivity analyses examine robustness to sensor miscalibration and additive noise. Field data from the Beaufort Sea demonstrate extraction of weak transient airgun and biological signals masked by intense broadband vessel noise. These results suggest that the method can be effective even in circumstances where acoustic arrivals are more accurately characterized as normal modes instead of plane waves.</p>","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"160 4","pages":"2902-2920"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149111408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Noa Kemp, Cynthia Tarlao, Catherine Guastavino, B Suresh Krishna
{"title":"Effect of an auditory static distractor on the perception of an auditory moving target.","authors":"Noa Kemp, Cynthia Tarlao, Catherine Guastavino, B Suresh Krishna","doi":"10.1121/10.0044523","DOIUrl":"https://doi.org/10.1121/10.0044523","url":null,"abstract":"<p><p>It is known that listeners lose the ability to discriminate the direction of motion of a revolving sound (clockwise vs counterclockwise) beyond a critical velocity [\"the upper limit (UL)\"], likely due to degraded front-back discrimination. Little is known about how this ability is affected by simultaneously present distractor sounds, despite the real-life importance of tracking moving sounds in the presence of distractors. We hypothesized that the presence of a static distractor sound would impair the perception of moving target sounds and reduce the UL and show that this is indeed the case. A distractor on the right was as effective as a distractor at the front in reducing the UL, despite the likely importance of resolving front-back confusions. By manipulating the spectral content of both the target and distractor, we found that the UL was significantly reduced only when the distractor spectrally overlaps with the target in the frequency range relevant for front-back discrimination. Our findings form the first steps toward a better understanding of the tracking of multiple sounds in the presence of distractors.</p>","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"160 4","pages":"3003-3019"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149182337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Transient cavitation dynamics of vaporized perfluorocarbon nanodroplets measured with an acoustical camera.","authors":"Mark T Burgess, Jeffrey A Ketterling","doi":"10.1121/10.0046799","DOIUrl":"https://doi.org/10.1121/10.0046799","url":null,"abstract":"<p><p>Perfluorocarbon nanodroplets are metastable phase-change contrast agents that convert into gas bubbles on demand through acoustic droplet vaporization (ADV). Their transient radial dynamics are difficult to measure without high-speed optical imaging. An acoustical camera approach characterizes post-ADV bubble dynamics acoustically. Perfluoropentane nanodroplets were activated with a 5 MHz focused pulse (peak negative pressure ≈5 MPa) and simultaneously probed at 35 MHz, with the side-scattered signal detected by an orthogonal receiver. Scattered amplitude scales with bubble radius, so the Hilbert-transformed envelope yields a relative radius-time response with microsecond resolution, revealing rapid growth and collapse consistent with transient inertial cavitation. Collapse times give a mean maximum bubble radius of 13.2 ± 1.8μm (N=475), roughly 300 times the >∼46 nm precursor radius, confirming strongly inertial overshoot. Deriving from pulse timing rather than amplitude, this estimate is independent of bubble position within the probe beam. The 35 MHz focal zone is approximately four times narrower than the 5 MHz activation zone, so the detected amplitude reflects lateral position rather than size, and only 7% of events fall within ±20% of the timing estimate. The technique offers a low-complexity route to quantifying post-ADV cavitation dynamics and comparing nanodroplet formulations.</p>","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"160 4","pages":"2951-2959"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149166216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Sparse spatial-frequency adaptive learning for enhancing underwater acoustical tonals under impulse noise.","authors":"Fengdan Jiang, Cheng Chi, Chonglei Liu, Donghao Ju, Xiaowei Zhang, Minglei Hou, Yangfan Zhang, Yu Li, Haining Huang","doi":"10.1121/10.0046804","DOIUrl":"https://doi.org/10.1121/10.0046804","url":null,"abstract":"<p><p>Enhancing and extracting sinusoidal signals (tonals) is a key challenge in underwater acoustic signal processing. However, conventional tonal enhancement methods deteriorate seriously under high levels of impulse noise. To address this problem, we propose a sparse spatial-frequency adaptive learning method for robust tonal enhancement in the presence of impulse noise. An array signal model is formulated to characterize spatially correlated impulse noise. Based on this model, we exploit the sparsity of tonals in the spatial-frequency domain and develop a sparse spatial-frequency beamforming approach to achieve initial tonal enhancement. To mitigate the false alarms caused by impulse noise artifacts in the resulting azimuth-frequency spectrum, we further introduce an adaptive learning scheme. This scheme exploits the stationarity of tonal signals and the non-stationarity of impulse noise to effectively suppress noise-induced artifacts, thereby achieving a higher output signal-to-noise ratio. The proposed method is validated using both simulated and real experimental data. Comparative results demonstrate that our approach outperforms baseline methods in terms of azimuth resolution and processing gain under impulse noise conditions.</p>","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"160 4","pages":"2782-2799"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149111356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Dome effect on the resonance frequency of acoustic pots.","authors":"Jean-Christophe Valiere, Christian Prax","doi":"10.1121/10.0046754","DOIUrl":"https://doi.org/10.1121/10.0046754","url":null,"abstract":"<p><p>This study contributes to a broader research programme examining the characteristics and selection criteria of acoustic pots in the medieval and Renaissance periods. The rationale behind the selection of the resonance frequency of these pots has traditionally been explained by the practice of tapping the pot's neck during manufacture. However, the frequency changes between the potter's shop and insertion into walls, vaults, or domes due to radiation conditions. It is well known in the literature on resonating pipes (e.g., organs) that, due to the inertia of the air in the open termination, the resonance frequency changes according to the insertion. Previous studies have examined baffled pipes, pipes without baffles, and pipes ending in a crown. Here, we use numerical simulation to study the resonance frequency of a Helmholtz resonator neck ended by a hemisphere. This configuration corresponds to an existing case on an archaeological site, while also providing a convenient mathematical model of a neck ending in a baffle with a certain radius of curvature. The article studies the effect of the dome on the frequency for both a Helmholtz resonator and a long pipe. Our results demonstrate that the frequency depends both on the diameter and length of the neck.</p>","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"160 4","pages":"3187-3195"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149220500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Dictionary reduction: A preprocessing method for efficient sparse reconstruction-based direction-of-arrival estimation.","authors":"Zhishu Feng, Nan Zou, Guangpu Zhang, Jin Fu","doi":"10.1121/10.0046883","DOIUrl":"https://doi.org/10.1121/10.0046883","url":null,"abstract":"<p><p>Direction-of-arrival (DOA) estimation based on sparse reconstruction typically constructs an overcomplete dictionary over the array observable range. Due to source sparsity, most dictionary atoms are redundant. This paper proposes two simple dictionary reduction methods to reduce computational cost. Method 1 calculates the distances of each atom to the signal subspace and the noise subspace and retains those atoms that are closer to the signal subspace. Method 2 reduces the dimension of either the signal subspace or the noise subspace to make the two subspaces equal in dimension and then performs dictionary reduction based on these two subspaces. Numerical simulations show that combining dictionary reduction with classical sparse reconstruction methods significantly reduces computational cost while also enhancing DOA estimation accuracy and resolution. Experimental results further validate the effectiveness of the proposed methods.</p>","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"160 4","pages":"3321-3339"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149244821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Translation of transient acoustic fields.","authors":"M J Carley","doi":"10.1121/10.0046890","DOIUrl":"https://doi.org/10.1121/10.0046890","url":null,"abstract":"<p><p>A method is presented for the translation of acoustic field data from a source to a target region. Field data are represented as spherical harmonic expansions on spheres surrounding the source and target regions, respectively, and expansions are translated using a \"point and shoot\" method using the Kirchhoff-Helmholtz integral to carry out an axial translation from one sphere to the other. The principal motivation for the method is its use in a time-domain fast multipole method, and test cases reflective of this application are presented. The method converges to six digits for appropriate values of parameters, and for the values of N considered here, computational effort scales approximately as N2, where N is the order of spherical harmonic expansion for the field data. The method is causal and thus avoids artifacts generated in methods that are not based on intrinsically causal formulations.</p>","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"160 4","pages":"3356-3364"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149245134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Wave propagation in unsaturated thermoporoelastic media based on a modified fractional Cole-Cole model.","authors":"Zhangna Xue, Tianhao Liu, Li-Yun Fu, Jianlin Liu","doi":"10.1121/10.0046953","DOIUrl":"https://doi.org/10.1121/10.0046953","url":null,"abstract":"<p><p>Accurate modeling of wave propagation in unsaturated thermoporoelastic media is essential for understanding seismic responses in heterogeneous reservoirs, geothermal exploration, and heavy oil recovery processes. Existing models based on the classical Lord-Shulman generalized thermoporoelastic theory employ a single relaxation mechanism, which cannot adequately describe broadband dispersion and attenuation caused by complex pore structures and multiphase fluid interactions. In this study, a modified fractional Cole-Cole model is introduced into the theoretical framework of unsaturated thermoporoelasticity to characterize frequency-dependent relaxation behavior. The governing equations of the unsaturated thermoporoelastic medium are first established by considering the coupled interactions among the solid skeleton, pore liquid, pore gas, and thermal field. Subsequently, numerical simulations are performed to examine the effects of fractional parameter, porosity, saturation, and permeability on wave dispersion and attenuation characteristics. Results demonstrate that the fractional Cole-Cole model provides a more accurate description of broadband relaxation behavior than the L-S model by capturing the heterogeneity of porous media. The fractional parameter controls the width and distribution of attenuation spectra, while porosity, saturation, and permeability significantly regulate the phase velocity and attenuation characteristics of different wave modes.</p>","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"160 4","pages":"3546-3558"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149269474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Dual-frequency remote wake-up signal detection for deep-sea incomplete channels via structure-semantic collaborative distillation.","authors":"Minhao Wang, Junjie Shi, Dajun Sun, Cuie Zheng","doi":"10.1121/10.0046925","DOIUrl":"https://doi.org/10.1121/10.0046925","url":null,"abstract":"<p><p>Deep-sea transponders serve as critical infrastructure, yet their operational lifetimes are significantly constrained by limited energy supplies. Consequently, acoustic wake-up mechanisms are essential to mitigate standby power consumption. These transponders are typically deployed on the seabed, deviating from the SOFAR channel axis, and remote transmission relies on incomplete channels characterized by multiple surface-bottom reflections. In such environments, severe and time-varying multipath effects degrade the detection performance of distant weak signals. To address these challenges, this paper proposes a robust detection framework that integrates a dual-frequency signal mechanism with lightweight knowledge distillation. First, dual-frequency signals are employed to circumvent the need for complex multipath channel estimation. Second, a TabPFN-based teacher network is constructed to extract robust feature representations. A structural-semantic collaborative distillation strategy is subsequently applied to align the student model with the teacher in both the embedding and logit spaces. This approach effectively transfers generalization capabilities to a lightweight micro-network comprising only 832 parameters, achieving high-precision diversity detection using a computationally efficient architecture. Sea experiment results demonstrate that the proposed method achieves a detection probability of 95.48% and a false alarm rate of 0.04% under incomplete channel conditions at ranges from 0 to 100 km.</p>","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"160 4","pages":"3488-3504"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149269500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Víctor M Catalá-Iborra, Antonio Martínez-González, Germán Ramos, Emilio Soria-Olivas, Maximo Cobos
{"title":"Acoustic inpainting of loudspeaker radiation balloons from sparse polar data using deep learninga).","authors":"Víctor M Catalá-Iborra, Antonio Martínez-González, Germán Ramos, Emilio Soria-Olivas, Maximo Cobos","doi":"10.1121/10.0046894","DOIUrl":"https://doi.org/10.1121/10.0046894","url":null,"abstract":"<p><p>Accurate characterization of loudspeaker radiation patterns is essential for system design and acoustic simulation, yet obtaining complete three-dimensional radiation balloons typically requires extensive and time-consuming measurements. This paper presents a deep-learning framework for the acoustic inpainting of high-resolution radiation balloons from a sparse set of only three polar measurement planes. By mapping non-uniform spherical coordinates onto a structured two-dimensional grid, we leverage a geo-informed convolutional U-Net architecture designed to learn high-dimensional spatial-spectral correlations from empirical radiation data within a curated dataset of measured professional loudspeakers. On unseen cabinets, the model achieves a global mean absolute error (MAE) of 1.24±0.07 dB, yielding an improvement of up to 0.65 dB over standard interpolation baselines. The practical utility of the model is validated through integration into professional simulation software, where the reconstructed patterns enable accurate line array modeling. This approach significantly reduces measurement complexity while maintaining the high fidelity required for advanced predictive acoustic engineering.</p>","PeriodicalId":17168,"journal":{"name":"Journal of the Acoustical Society of America","volume":"160 4","pages":"3428-3439"},"PeriodicalIF":2.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149269509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}