The Journal of the Acoustical Society of America

Normal mode simulations of underwater acoustic propagation can be computationally intensive, particularly for broadband signals or iterative applications like inversion. An approach using neural network (NN) is introduced to approximate and accelerate these simulations. The NN predicts modal parameters, such as the horizontal wavenumbers and modal depth functions. Modal parameters are predicted a…

Ecological momentary assessment (EMA) is frequently utilized to evaluate hearing programs (HPs) in real life, either by indirect comparison (i.e., rating one program in each study period) or by direct comparison (i.e., switching between HPs in a survey and rating the difference). To compare these methods, a randomized crossover design was implemented with 30 participants and three hearing program…

Matched field processing (MFP) requires prior knowledge of the frequency for the source, which is often unknown, and must be estimated from the received signals. Extending conventional MFP, incoherent frequency-unknown matched field processing (FU-MFP) is presented by incorporating the inversion of transmission frequency and radial velocity. Motion compensation of the Doppler frequency shift is a…

A key challenge in binaural spatial audio personalisation is defining perceptual similarity metrics that meaningfully rate non-individual head-related transfer function (HRTF) fit. A metric using Bayesian auditory modelling has recently been proposed to address this. It predicts human localisation performance with non-individual HRTFs by matching their auditory cues to individual cues and selects…

We report the repeated in situ observation of nonlinear mesoscopic elasticity in an ∼760 m3 unstable rock column undergoing drilling for bolting reinforcement. Analysis of the anomalous nonlinear fast dynamics at the onset of drilling showed a clear correlation between top-of-column acceleration and small (a few percent) drops in resonance frequency. Slow dynamics were also observed, appearing as…

This paper investigates the physical significance of ear-canal wave quantities-such as absorbance-that are commonly measured in wideband-acoustic-immittance tests and evaluates whether these quantities uniquely characterize middle-ear function. This is explored using simulations of lumped-element and transmission-line ear canals, along with measurements in three-dimensional-printed uniform and an…

Auditory temporal resolution plays a critical role in the everyday experience of listening to complex acoustic patterns. The two most commonly used methods for obtaining measures of auditory temporal resolution are gap detection and amplitude modulation (AM) detection. In an attempt to develop a standardized clinical test of auditory temporal resolution, we used Zippy Estimation by Sequential Tes…

Transcranial focused ultrasound is a promising neuromodulation tool, but skull-induced aberrations to the ultrasound beam require subject-specific correction. To predict and compensate for aberration, the standard in transcranial focused ultrasound is to perform acoustic simulations based on x-ray computed tomography images of the head. However, computed tomography-based methods face shortcomings…

This paper presents a version of an optimization-based model of speech production that reproduces key acoustic and articulatory features of sensorimotor adaptation to altered sensory feedback. In the presented approach, the mechanism of sensorimotor adaptation is solely driven by independently motivated regular updates, based on the sensory feedback perceived by the speaker, of two of the speaker…

This work presents a direct comparison of time reversal (TR) and cross correlation (CC) for wave refocusing, with application to shear wave elastography. Standard theoretical equivalence relies on idealized assumptions, such as diffuse fields, that are rarely met in practice. A unified framework based on a reciprocal configuration to enable a direct, assumption-free comparison is proposed. A key …

This study investigates the use of speakers (earphones) as sensors for detecting acoustic loads through variations in electrical impedance. Leveraging electroacoustic coupling and machine learning-based analysis, impedance features were used to predict insertion depth with high accuracy. The dense neural network-based classification achieved 87% overall accuracy, improving to 91% with speaker-spe…

Direction-of-arrival (DOA) estimation plays a critical role in underwater acoustic applications such as target detection, localization, tracking, and identification. Unlike image or speech processing, underwater array signal processing faces unique challenges because of low signal-to-noise ratio (SNR) and limited snapshots. In such conditions, whether traditional methods (e.g., conventional beamf…

A three-dimensional, microsphere array, locally resonant phononic crystal has been designed to address the problem of low-frequency vibration in the range of 50-350 Hz in engineering applications. The energy band and transmission loss are calculated using the finite element method. The bandgap formation mechanism is analyzed by co-constructing the mass-spring model and displacement mode. In addit…

Voice, or phonation quality, is a central concept across multiple domains of phonetic theory. However, the acoustic measurements used to quantify voice quality are far from straightforward. Recently, Chai and Garellek [J. Acoust. Soc. Am. 152(3), 1856-1870 (2022)] proposed residual H1* as an improvement over the oft-used H1*-H2* measure. Here, this Letter raises concerns about the robustness of t…

Conventional impedance-tube and reverberation-chamber methods for characterizing acoustic materials provide only normal- or diffuse-incidence sound absorption data. This limitation reduces their applicability under realistic room-acoustic conditions and motivates the development of directional characterization methods. In this work, a reverberation-chamber-based framework is presented for determi…

Conventional passive earmuffs, which have a single number rating (SNR) of 28-32 dB, can effectively protect users' hearing but block useful lower-intensity sound waves, such as speech, causing communication difficulties. This leads employees to remove their earmuffs to comprehend important information or to avoid miscommunication while wearing earmuffs, which might lead to accidents. This problem…

This work presents a methodology to study the noise generated by confined flows, i.e., flows enclosed within a device, which therefore significantly influence both the flow characteristics and the transmission of noise. A coupling workflow is implemented to link computational fluid dynamics simulations and structural dynamic analysis, where the pressure field computed in the fluid domain provides…

Acoustic metamaterials are a class of architected materials with dynamic properties that are designed at the sub-wavelength scale to achieve exotic or unique macroscopic response. Although early concepts of acoustic metamaterials relied on static configurations, recent research has further expanded the limits of acoustic customization by incorporating active or tunable responses. This article pro…

High-frequency scattering from elastic objects in water can include significant contributions from structural guided waves. Those contributions can appear to be radiated from virtual sources within the structure. Quasi-holographic backpropagation (QHBP) limited to supersonic wave numbers can reveal the location in space and time of the virtual sources of scattered sound [Baik, Dudley, and Marston…

Binaural audio rendering aims to reconstruct virtual sound images at a listener's ears using headphones or loudspeakers. While headphones can deliver stereo sound separately to each ear, loudspeakers-based binaural audio systems suffer from intrinsic crosstalk, which necessitates crosstalk cancellation (CTC) as a preprocessing technique. Traditional two-channel CTC methods experience performance …