Published in The Journal of the Acoustical Society of America
An incremental wave superimposed on a pre-deformed hyper-elastic material perceives an elastic media with the instantaneous modulus of the current material. This offers a new route with a broadband feature to control elastic waves by purposely creating finite deformation field. This study proves that the governing equation of a semi-linear material...
Published in The Journal of the Acoustical Society of America
Source localization in ocean acoustics is posed as a machine learning problem in which data-driven methods learn source ranges directly from observed acoustic data. The pressure received by a vertical linear array is preprocessed by constructing a normalized sample covariance matrix and used as the input for three machine learning methods: feed-for...
Published in The Journal of the Acoustical Society of America
This paper presents a technique for calculating tracks of striations observed in the plot of acoustic intensity versus range and frequency. The striations result from the interference in acoustic propagation below the critical depth. The key of this technique is modeling Lloyd's-mirror interference fringes based on the ray-based description of the ...
Published in The Journal of the Acoustical Society of America
Processing speaker-specific information is an important task in daily communication. This study examined how fundamental frequency (F0) cues were encoded at the subcortical level, as reflected by scalp-recorded frequency-following responses, and their relationship with the listener's ability in processing speech stimuli produced by multiple speaker...
Published in The Journal of the Acoustical Society of America
This study investigates the interaction between voice quality and pitch by revisiting the well-known case of Mandarin creaky voice. This study first provides several pieces of experimental data to assess whether the mechanism behind allophonic creaky voice in Mandarin is tied to tonal categories or is driven by phonetic pitch ranges. The results sh...
Published in The Journal of the Acoustical Society of America
Ground parrot vocalisation can be considered as an audio event. Test-based diverse density multiple instance learning (TB-DD-MIL) is proposed for detecting this event in audio files recorded in the field. The proposed method is motivated by the advantages of multiple instance learning from incomplete training data. Spectral features suitable for en...
Published in The Journal of the Acoustical Society of America
In a fully nonlinear model of wave propagation through bubbly media, computational complexity arises when the medium contains a polydisperse bubble population. This is because a nonlinear ordinary differential equation governing the bubble response must be solved for the current radius of each bubble size present at every spatial location and at ev...
Published in The Journal of the Acoustical Society of America
Underwater sound scattering by a rough sea surface, ice, or a rough elastic bottom is studied. The study includes both the scattering from the rough boundary and the elastic effects in the solid layer. A coupled mode matrix is approximated by a linear function of one random perturbation parameter such as the ice-thickness or a perturbation of the s...
Published in The Journal of the Acoustical Society of America
In this work an expression for the solution of the Helmholtz equation for wedge spaces is derived. Such propagation spaces represent scenarios for many acoustical problems where a free field assumption is not eligible. The proposed sound field model is derived from the general solution of the wave equation in cylindrical coordinates, using sets of ...
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