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Journal of the Acoustical Society of America
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#1Emily T. GriffithsH-Index: 2
#2Frederick I. Archer (NMFS: National Marine Fisheries Service)H-Index: 20
Last. Jeffrey E. Moore (NMFS: National Marine Fisheries Service)H-Index: 20
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In the California Current off the United States West Coast, there are three offshore cetacean species that produce narrow-band high frequency (NBHF) echolocation pulses: Dall's porpoise (Phocoenoides dalli) and two species of Kogia. NBHF pulses exist in a highly specialized acoustic niche thought to be outside the hearing range of killer whales and other potential mammal-eating odontocetes. Very little is known about the dwarf and pygmy sperm whales (K. sima and K. breviceps), including their NB...
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#1Jiaxin Zhong (UTS: University of Technology, Sydney)H-Index: 1
#2Ray Kirby (UTS: University of Technology, Sydney)H-Index: 15
Last. Xiaojun Qiu (UTS: University of Technology, Sydney)H-Index: 17
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The existing non-paraxial expression of audio sounds generated by a parametric array loudspeaker (pal) is hard to calculate due to the fivefold integral in it. A rigorous solution of the Westervelt equation under the quasilinear approximation is developed in this paper for circular PALs by using the spherical harmonics expansion, which simplifies the expression into a series of threefold summations with uncoupled angular and radial components. The angular component is determined by Legendre poly...
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#1Braden N. Maxwell (UR: University of Rochester)
#2Virginia M. Richards (UCI: University of California, Irvine)H-Index: 16
Last. Laurel H. Carney (UR: University of Rochester)H-Index: 34
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Results of simultaneous notched-noise masking are commonly interpreted as reflecting the bandwidth of underlying auditory filters. This interpretation assumes that listeners detect a tone added to notched-noise based on an increase in energy at the output of an auditory filter. Previous work challenged this assumption by showing that randomly and independently varying (roving) the levels of each stimulus interval does not substantially worsen listener thresholds [Lentz, Richards, and Matiasek (1...
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#1Shulin Wen (NTU: Nanyang Technological University)
#2Woon-Seng Gan (NTU: Nanyang Technological University)H-Index: 26
Last. Dongyuan Shi (NTU: Nanyang Technological University)H-Index: 3
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The gradual adaptation and possibility of divergence hinder the active noise control system from being applied to a wider range of applications. Selective active noise control has been proposed to rapidly reduce noise by selecting a pre-trained control filter for different primary noise detected without an error microphone. For stationary noise, considerable noise reduction performance with a short selection period is obtained. For non-stationary noise, more restrictive requirements are imposed ...
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#1Allison P. Anderson (CU: University of Colorado Boulder)H-Index: 4
#2K. B. Covington (CU: University of Colorado Boulder)
Last. Jay C. Buckey (Dartmouth College)H-Index: 27
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Distortion product otoacoustic emission (DPOAE) maps collect DPOAE emissions over a broad range of frequencies and ratios. One application of DPOAE mapping could be monitoring changes in intracranial pressure (ICP) in space, where non-invasive measures of ICP are an area of interest. Data were collected in two experiments to statistically assess changes in DPOAE maps. A repeatability study where four maps per subject were collected across four weeks to establish “normal” variability in DPOAE dat...
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#1András Szabó (BME: Budapest University of Technology and Economics)H-Index: 10
#2Péter Tamás Nagy (BME: Budapest University of Technology and Economics)H-Index: 1
Last. György Paál (BME: Budapest University of Technology and Economics)H-Index: 8
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To determine sound absorption coefficients of fine granular materials, the materials must be cased to suppress their flowability. In this study, effects of casing on the sound absorption coefficients of fine granular materials were investigated. The normal incidence sound absorption coefficients of cased hollow glass beads were measured using cylindrical impedance tubes. The measurement results demonstrated that the hollow glass beads present a sound absorption peak, which was attributed to the ...
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#1K. Carillo (École de technologie supérieure)H-Index: 2
#2Olivier Doutres (École de technologie supérieure)H-Index: 11
Last. Franck SgardH-Index: 14
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The objective occlusion effect induced by bone-conducted stimulation refers to the low frequency acoustic pressure increase that results from occluding the ear canal opening. This phenomenon is commonly interpreted as follows: the bone-conducted sound “leaks” through the earcanal opening and is “trapped” by the occlusion device. This instinctive interpretation misrepresents the fundamental mechanism of the occlusion effect related to the earcanal impedance increase and already highlighted by exi...
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#1Minseuk Park (SNU: Seoul National University)
#2Yongsung Park (SNU: Seoul National University)H-Index: 1
Last. Woojae Seong (SNU: Seoul National University)H-Index: 12
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Noise induced by incipient-propeller tip vortex cavitation (TVC) has a few sources near the propeller tips, which radiate a broadband signal. This article describes a compressive sensing (CS)-based TVC localization technique for coherent multiple-frequency processing, which jointly processes the measured data at multiple frequencies. Block-sparse CS, which groups several single-frequency measurements into blocks, is adopted for coherent multiple-frequency processing. The coherent multiple-freque...
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#1Yang Liu (HEU: Harbin Engineering University)
#2Jingtao Du (HEU: Harbin Engineering University)H-Index: 10
Last. Li Cheng (PolyU: Hong Kong Polytechnic University)H-Index: 33
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The concept of the radiation modes, originally proposed for free-field problems, has found its widespread use in sound radiation analyses of vibrating structures and their active control applications. In this paper, the sound radiation of a flexible structure, flush-mounted inside a duct in both 2D and 3D configurations, is investigated via an energy-based formulation in conjunction with the near-field integration technique. The structural radiation characteristics are first discussed in terms o...
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