Relevant bibliographies by topics / Complex acoustic environments / Journal articles

Journal articles on the topic 'Complex acoustic environments'

To see the other types of publications on this topic, follow the link: Complex acoustic environments.
Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Complex acoustic environments.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Weisser, Adam, Jörg M. Buchholz, and Gitte Keidser. "Complex Acoustic Environments: Review, Framework, and Subjective Model." Trends in Hearing 23 (January 2019): 233121651988134. http://dx.doi.org/10.1177/2331216519881346.

Full text
Abstract:
The concept of complex acoustic environments has appeared in several unrelated research areas within acoustics in different variations. Based on a review of the usage and evolution of this concept in the literature, a relevant framework was developed, which includes nine broad characteristics that are thought to drive the complexity of acoustic scenes. The framework was then used to study the most relevant characteristics for stimuli of realistic, everyday, acoustic scenes: multiple sources, source diversity, reverberation, and the listener’s task. The effect of these characteristics on perceived scene complexity was then evaluated in an exploratory study that reproduced the same stimuli with a three-dimensional loudspeaker array inside an anechoic chamber. Sixty-five subjects listened to the scenes and for each one had to rate 29 attributes, including complexity, both with and without target speech in the scenes. The data were analyzed using three-way principal component analysis with a (2 3 2) Tucker3 model in the dimensions of scales (or ratings), scenes, and subjects, explaining 42% of variation in the data. “Comfort” and “variability” were the dominant scale components, which span the perceived complexity. Interaction effects were observed, including the additional task of attending to target speech that shifted the complexity rating closer to the comfort scale. Also, speech contained in the background scenes introduced a second subject component, which suggests that some subjects are more distracted than others by background speech when listening to target speech. The results are interpreted in light of the proposed framework.
APA, Harvard, Vancouver, ISO, and other styles
2

Kidd, Gerald. "Understanding Speech in Complex Acoustic Environments." Clinical Research Education Library 1, no. 1 (2016): 1. http://dx.doi.org/10.1044/cred-pvd-c16005.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Funkhouser, Thomas, Ingrid Carlbom, Gary Elko, Gopal Pingali, Mohan Sondhi, and James West. "Interactive acoustic modeling of complex environments." Journal of the Acoustical Society of America 105, no. 2 (February 1999): 1357–58. http://dx.doi.org/10.1121/1.426431.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Baresch, Diego, and Valeria Garbin. "Acoustic trapping of microbubbles in complex environments and controlled payload release." Proceedings of the National Academy of Sciences 117, no. 27 (June 22, 2020): 15490–96. http://dx.doi.org/10.1073/pnas.2003569117.

Full text
Abstract:
Contactless manipulation of microparticles using acoustic waves holds promise for applications ranging from cell sorting to three-dimensional (3D) printing and tissue engineering. However, the unique potential of acoustic trapping to be applied in biomedical settings remains largely untapped. In particular, the main advantage of acoustic trapping over optical trapping, namely the ability of sound to propagate through thick and opaque media, has not yet been exploited in full. Here we demonstrate experimentally the use of the recently developed technique of single-beam acoustical tweezers to trap microbubbles, an important class of biomedically relevant microparticles. We show that the region of vanishing pressure of a propagating vortex beam can confine a microbubble by forcing low-amplitude, nonspherical, shape oscillations, enabling its full 3D positioning. Our interpretation is validated by the absolute calibration of the acoustic trapping force and the direct spatial mapping of isolated bubble echos, for which both find excellent agreement with our theoretical model. Furthermore, we prove the stability of the trap through centimeter-thick layers of bio-mimicking, elastic materials. Finally, we demonstrate the simultaneous trapping of nanoparticle-loaded microbubbles and activation with an independent acoustic field to trigger the release of the nanoparticles. Overall, using exclusively acoustic powering to position and actuate microbubbles paves the way toward controlled delivery of drug payloads in confined, hard-to-reach locations, with potential in vivo applications.
APA, Harvard, Vancouver, ISO, and other styles
5

Shamma, Shihab. "Cortical processes for navigating complex acoustic environments." Journal of the Acoustical Society of America 135, no. 4 (April 2014): 2172. http://dx.doi.org/10.1121/1.4877063.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Fink, Mathias. "Time-reversal acoustics in complex environments." GEOPHYSICS 71, no. 4 (July 2006): SI151—SI164. http://dx.doi.org/10.1190/1.2215356.

Full text
Abstract:
Time-reversal mirrors (TRMs) refocus an incident acoustic field to the position of the original source regardless of the complexity of the propagation medium. TRMs have now been implemented in a variety of physical scenarios from megahertz ultrasonics with aperture sizes of the order of centimeters to ocean acoustics at hundreds to thousands of hertz with aperture sizes of the order of hundreds of meters. Common to this broad range of scales is a remarkable robustness — exemplified by observations at all scales — that the more complex the medium between the probe source and the TRM, the sharper the focus. The relationship between the medium complexity and the size of the focal spot is studied in this paper. This relationship is certainly the most exciting property of TRM compared to standard focusing devices. A TRM acts as an antenna that uses complex environments to appear wider than it is, resulting in a broadband pulse with a refocusing quality that does not depend on the TRM aperture. In this paper, we investigate both the role of the time-reversal window duration and the bandwidth of the time-reversed signals for various media (waveguide, closed cavity, random medium).
APA, Harvard, Vancouver, ISO, and other styles
7

Dufour, Frank. "Acoustic Shadows: An Auditory Exploration of the Sense of Space." SoundEffects - An Interdisciplinary Journal of Sound and Sound Experience 1, no. 1 (December 2, 2011): 82–97. http://dx.doi.org/10.7146/se.v1i1.4074.

Full text
Abstract:
This paper examines the question of auditory detection of the movements of silent objects in noisy environments. The approach to studying and exploring this phenomenon is primarily based on the framework of the ecology of perception defined by James Gibson (Gibson, 1979) in the sense that it focuses on the direct auditory perception of events, or “structured energy that specifies properties of the environment” (Michaels & Carello, 1981 P. 157). The goal of this study is triple: -Theoretical; for various reasons, this kind of acoustic situations has not been extensively studied by traditional acoustics and psychoacoustics, therefore, this project demonstrates and supports the pertinence of the Ecology of Perception for the description and explanation of such complex phenomena. -Practical; like echolocation, perception of acoustic shadows can be improved by practice, this project intends to contribute to the acknowledgment of this way of listening and to help individuals placed in noisy environments without the support of vision acquiring a detailed detection of the movements occurring in these environments. -Artistic; this project explores a new artistic expression based on the creation and exploration of complex multisensory environments. Acoustic Shadows, a multimedia interactive composition is being developed on the premises of the ecological approach to perception. The last dimension of this project is meant to be a contribution to the sonic representation of space in films and in computer generated virtual environments by producing simulations of acoustic shadows.
APA, Harvard, Vancouver, ISO, and other styles
8

Leibold, Lori J. "Speech Perception in Complex Acoustic Environments: Developmental Effects." Journal of Speech, Language, and Hearing Research 60, no. 10 (October 17, 2017): 3001–8. http://dx.doi.org/10.1044/2017_jslhr-h-17-0070.

Full text
Abstract:
Purpose The ability to hear and understand speech in complex acoustic environments follows a prolonged time course of development. The purpose of this article is to provide a general overview of the literature describing age effects in susceptibility to auditory masking in the context of speech recognition, including a summary of findings related to the maturation of processes thought to facilitate segregation of target from competing speech. Method Data from published and ongoing studies are discussed, with a focus on synthesizing results from studies that address age-related changes in the ability to perceive speech in the presence of a small number of competing talkers. Conclusions This review provides a summary of the current state of knowledge that is valuable for researchers and clinicians. It highlights the importance of considering listener factors, such as age and hearing status, as well as stimulus factors, such as masker type, when interpreting masked speech recognition data. Presentation Video http://cred.pubs.asha.org/article.aspx?articleid=2601620
APA, Harvard, Vancouver, ISO, and other styles
9

Kuperman, W. A., Michael B. Porter, and John S. Perkins. "Three‐dimensional oceanographic acoustic modeling of complex environments." Journal of the Acoustical Society of America 82, S1 (November 1987): S42. http://dx.doi.org/10.1121/1.2024809.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Mhatre, N., and R. Balakrishnan. "Predicting acoustic orientation in complex real-world environments." Journal of Experimental Biology 211, no. 17 (September 1, 2008): 2779–85. http://dx.doi.org/10.1242/jeb.017756.

Full text
APA, Harvard, Vancouver, ISO, and other styles
11

Moss, Cynthia, Kaushik Ghose, Marianne Jensen, and Annemarie Surlykke. "Acoustic behavior of echolocating bats in complex environments." Journal of the Acoustical Society of America 115, no. 5 (May 2004): 2516–17. http://dx.doi.org/10.1121/1.4783200.

Full text
APA, Harvard, Vancouver, ISO, and other styles
12

Colburn, H. Steven, Barbara Shinn‐Cunningham, and Kamal Sen. "Spatial aspects of acoustic processing in complex environments." Journal of the Acoustical Society of America 125, no. 4 (April 2009): 2489. http://dx.doi.org/10.1121/1.4783302.

Full text
APA, Harvard, Vancouver, ISO, and other styles
13

Zündorf, Ida C., Jörg Lewald, and Hans-Otto Karnath. "Neural Correlates of Sound Localization in Complex Acoustic Environments." PLoS ONE 8, no. 5 (May 14, 2013): e64259. http://dx.doi.org/10.1371/journal.pone.0064259.

Full text
APA, Harvard, Vancouver, ISO, and other styles
14

Litovsky, Ruth. "Speech intelligibility in complex acoustic environments in young children." Journal of the Acoustical Society of America 113, no. 4 (April 2003): 2207. http://dx.doi.org/10.1121/1.4780218.

Full text
APA, Harvard, Vancouver, ISO, and other styles
15

Priyadarshani, Nirosha, Stephen Marsland, and Isabel Castro. "Automated birdsong recognition in complex acoustic environments: a review." Journal of Avian Biology 49, no. 5 (May 2018): jav—01447. http://dx.doi.org/10.1111/jav.01447.

Full text
APA, Harvard, Vancouver, ISO, and other styles
16

Weisser, Adam, Jörg M. Buchholz, Chris Oreinos, Javier Badajoz-Davila, James Galloway, Timothy Beechey, and Gitte Keidser. "The Ambisonic Recordings of Typical Environments (ARTE) Database." Acta Acustica united with Acustica 105, no. 4 (July 1, 2019): 695–713. http://dx.doi.org/10.3813/aaa.919349.

Full text
Abstract:
Everyday listening environments are characterized by far more complex spatial, spectral and temporal sound field distributions than the acoustic stimuli that are typically employed in controlled laboratory settings. As such, the reproduction of acoustic listening environments has become important for several research avenues related to sound perception, such as hearing loss rehabilitation, soundscapes, speech communication, auditory scene analysis, automatic scene classification, and room acoustics. However, the recordings of acoustic environments that are used as test material in these research areas are usually designed specifically for one study, or are provided in custom databases that cannot be universally adapted, beyond their original application. In this work we present the Ambisonic Recordings of Typical Environments (ARTE) database, which addresses several research needs simultaneously: realistic audio recordings that can be reproduced in 3D, 2D, or binaurally, with known acoustic properties, including absolute level and room impulse response. Multichannel higher-order ambisonic recordings of 13 realistic typical environments (e.g., office, cafè, dinner party, train station) were processed, acoustically analyzed, and subjectively evaluated to determine their perceived identity. The recordings are delivered in a generic format that may be reproduced with different hardware setups, and may also be used in binaural, or single-channel setups. Room impulse responses, as well as detailed acoustic analyses, of all environments supplement the recordings. The database is made open to the research community with the explicit intention to expand it in the future and include more scenes.
APA, Harvard, Vancouver, ISO, and other styles
17

Özcan, Elif, Cornelis L. H. Broekmeulen, Zoe Alexandra Luck, Monique van Velzen, Pieter Jan Stappers, and Judy Reed Edworthy. "Acoustic Biotopes, Listeners and Sound-Induced Action: A Case Study of Operating Rooms." International Journal of Environmental Research and Public Health 19, no. 24 (December 12, 2022): 16674. http://dx.doi.org/10.3390/ijerph192416674.

Full text
Abstract:
As socio-technological environments shape and direct listener behaviour, an ecological account is needed that encompasses listening in complexity (i.e., multiple listeners, multiple sounds and their sources, and multiple sound-induced actions that ensure the success of a mission). In this study, we explored sound-induced action under the framework of “acoustic biotopes” (a notion of ecological acoustics by Smolders, Aertsen, and Johanessma, 1979 and 1982) in a specific socio-technological environment, i.e., the context of an orthopaedic operating room. Our approach is based on literature research into the topics of environmental psychology and auditory perception and action and in situ observations in healthcare with field recordings, participatory observations, and interviews on the spot. The results suggest a human-centered definition of sound-induced action in acoustic biotopes: Acoustic biotope is an active and shared sound environment with entangled interactions and sound-induced actions taking place in a specific space that has a critical function. Listening in highly functional environments is an individual experience and is influenced by hearing function, physical position and role in an environment, and the task at hand. There is a range of active and passive sound listeners as a function of their attentive state and listeners as sound sources within the acoustic biotope. There are many different sound sources and sound locals in socio-technological environments and sounds have great potential to serve critical information to operators. Overall, our study provides a holistic, multi-layered and yet a listener-centric view on the organisation of complex spaces and the results can immediately be applicable for rethinking the acoustic environment for ORs for better listening and sound-induced action.
APA, Harvard, Vancouver, ISO, and other styles
18

CUNEFARE, KENNETH A., and BRIAN S. DATER. "STRUCTURAL ACOUSTIC OPTIMIZATION USING THE COMPLEX METHOD." Journal of Computational Acoustics 11, no. 01 (March 2003): 115–37. http://dx.doi.org/10.1142/s0218396x03001833.

Full text
Abstract:
An optimization program based on M. J. Box's Complex Method was implemented in a computational design tool for constrained optimization of acoustic environments produced by vibrating structures. The tool can treat interior and exterior environments, and can consider acoustic and structural excitations. The tool integrates finite element and boundary element methods to perform the requisite structural acoustic analyses. The new optimization component described in this paper contains unique additions to Box's original algorithm. The optimizer executes stand-alone, or can be used as a starting point generator for another optimizer, thus creating a hybrid algorithm. This paper describes the new optimizer's algorithm and the results of an example optimization to reduce the interior noise levels within an unstiffened cylindrical shell. Design variables were selected as the shell thicknesses, subject to upper and lower bounds. All analyses were performed at a single excitation frequency. The results demonstrate effective performance of the optimizer, and the potential to obtain significant noise level reductions though the use of other-than-uniform thickness distributions.
APA, Harvard, Vancouver, ISO, and other styles
19

Kerber, S., and B. U. Seeber. "Towards quantifying cochlear implant localization performance in complex acoustic environments." Cochlear Implants International 12, sup2 (August 2011): S27—S29. http://dx.doi.org/10.1179/146701011x13074645127351.

Full text
APA, Harvard, Vancouver, ISO, and other styles
20

Waxler, Roger M., Doru Velea, Jessie Bonner, and Carrick Talmadge. "Acoustic signals and directivity for explosive sources in complex environments." Journal of the Acoustical Society of America 134, no. 5 (November 2013): 4193. http://dx.doi.org/10.1121/1.4831379.

Full text
APA, Harvard, Vancouver, ISO, and other styles
21

Zhu, Jun, Hanhao Zhu, Jun Tang, and Guangxue Zheng. "Researches on very low frequency acoustic signal propagation characteristics in different shallow elastic wedge bottoms." MATEC Web of Conferences 283 (2019): 02003. http://dx.doi.org/10.1051/matecconf/201928302003.

Full text
Abstract:
Targeted at the issue of extremely low-frequency (<100Hz) acoustic propagation in complex shallow elastic bottom environments. The influence law of different complex elastic bottoms on the acoustic signal propagation at very low frequency by acoustic energy flux has been analyzed with the simulation, which is based on the finite element method. The elastic bottoms which have been studied are the shallow horizontal elastic bottom, and the up-sloping and the down-sloping elastic bottom. The results show that the acoustic signal propagating in the up-sloping and down-sloping elastic bottom environments is more complex than that propagating in the horizontal elastic bottom, and the acoustic energy leaking into those elastic bottoms has very different influence on the acoustic signal propagation, especially in the up-sloping bottom.
APA, Harvard, Vancouver, ISO, and other styles
22

Jennings, Todd R., and Gerald Kidd. "A visually guided beamformer to aid listening in complex acoustic environments." Journal of the Acoustical Society of America 143, no. 3 (March 2018): 1743. http://dx.doi.org/10.1121/1.5035689.

Full text
APA, Harvard, Vancouver, ISO, and other styles
23

Ross, Samuel R. P.-J., Nicholas R. Friedman, Masashi Yoshimura, Takuma Yoshida, Ian Donohue, and Evan P. Economo. "Utility of acoustic indices for ecological monitoring in complex sonic environments." Ecological Indicators 121 (February 2021): 107114. http://dx.doi.org/10.1016/j.ecolind.2020.107114.

Full text
APA, Harvard, Vancouver, ISO, and other styles
24

Weisser, Adam, and Jorg M. Buchholz. "Subjective attributes of realistic sound fields: What makes acoustic environments complex?" Journal of the Acoustical Society of America 140, no. 4 (October 2016): 3277. http://dx.doi.org/10.1121/1.4970415.

Full text
APA, Harvard, Vancouver, ISO, and other styles
25

Arvidsson, Emma, Erling Nilsson, Delphine Bard-Hagberg, and Ola J. I. Karlsson. "Subjective Experience of Speech Depending on the Acoustic Treatment in an Ordinary Room." International Journal of Environmental Research and Public Health 18, no. 23 (November 23, 2021): 12274. http://dx.doi.org/10.3390/ijerph182312274.

Full text
Abstract:
In environments such as classrooms and offices, complex tasks are performed. A satisfactory acoustic environment is critical for the performance of such tasks. To ensure a good acoustic environment, the right acoustic treatment must be used. The relation between different room acoustic treatments and how they affect speech perception in these types of rooms is not yet fully understood. In this study, speech perception was evaluated for three different configurations using absorbers and diffusers. Twenty-nine participants reported on their subjective experience of speech in respect of different configurations in different positions in a room. They judged sound quality and attributes related to speech perception. In addition, the jury members ranked the different acoustic environments. The subjective experience was related to the different room acoustic treatments and the room acoustic parameters of speech clarity, reverberation time and sound strength. It was found that people, on average, rated treatments with a high degree of absorption as best. This configuration had the highest speech clarity value and lowest values for reverberation time and sound strength. The perceived sound quality could be correlated to speech clarity, while attributes related to speech perception had the strongest association with reverberation time.
APA, Harvard, Vancouver, ISO, and other styles
26

Eichenauer, Anja, Uwe Baumann, Timo Stöver, and Tobias Weissgerber. "Interleaved Acoustic Environments: Impact of an Auditory Scene Classification Procedure on Speech Perception in Cochlear Implant Users." Trends in Hearing 25 (January 2021): 233121652110141. http://dx.doi.org/10.1177/23312165211014118.

Full text
Abstract:
Clinical speech perception tests with simple presentation conditions often overestimate the impact of signal preprocessing on speech perception in complex listening environments. A new procedure was developed to assess speech perception in interleaved acoustic environments of different complexity that allows investigation of the impact of an automatic scene classification (ASC) algorithm on speech perception. The procedure was applied in cohorts of normal hearing (NH) controls and uni- and bilateral cochlear implant (CI) users. Speech reception thresholds (SRTs) were measured by means of a matrix sentence test in five acoustic environments that included different noise conditions (amplitude modulated and continuous), two spatial configurations, and reverberation. The acoustic environments were encapsulated in a randomized, mixed order single experimental run. Acoustic room simulation was played back with a loudspeaker auralization setup with 128 loudspeakers. 18 NH, 16 unilateral, and 16 bilateral CI users participated. SRTs were evaluated for each individual acoustic environment and as mean-SRT. Mean-SRTs improved by 2.4 dB signal-to-noise ratio for unilateral and 1.3 dB signal-to-noise ratio for bilateral CI users with activated ASC. Without ASC, the mean-SRT of bilateral CI users was 3.7 dB better than the SRT of unilateral CI users. The mean-SRT indicated significant differences, with NH group performing best and unilateral CI users performing worse with a difference of up to 13 dB compared to NH. The proposed speech test procedure successfully demonstrated that speech perception and benefit with ASC depend on the acoustic environment.
APA, Harvard, Vancouver, ISO, and other styles
27

Marengo, Edwin A., and Fred K. Gruber. "Optical-Theorem-Based Coherent Scatterer Detection in Complex Environments." International Journal of Antennas and Propagation 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/231729.

Full text
Abstract:
A new approach is proposed to detect scatterers embedded in reciprocal media from scattering data. The new method is rooted on physical considerations, in particular, on the optical theorem applicable to wavefields (e.g., acoustic, electromagnetic, and optical). The approach exploits insight gained from the optical theorem which assigns physical energy interpretations to the wave data from time reversal mirrors and cavities from which one can deduce the presence of unknown scatterers in unknown background media. The proposed approach is ideally suited for target detection in complex, highly reverberating unknown environments such as indoor facilities, caves, tunnels, and urban canyon.
APA, Harvard, Vancouver, ISO, and other styles
28

L'Her, Alexandre, Angélique Drémeau, Florent Le Courtois, Gaultier Real, Xavier Cristol, and Yann Stéphan. "Canonical correlation analysis as a statistical method to relate underwater acoustic propagation and ocean fluctuations." JASA Express Letters 2, no. 10 (October 2022): 100801. http://dx.doi.org/10.1121/10.0014360.

Full text
Abstract:
Numerical models are currently used to understand how environmental fluctuations impact acoustic propagation. Such a process can be tedious in complex fluctuating environments. This letter proposes a complementary approach based upon canonical correlation analysis (CCA) to determine statistical relationships between two sets of observed acoustic and oceanographic variables. It is shown, as an example, how CCA puts forward the impact of external and internal tide on shallow water propagation. Results are consistent with the physical understanding of tide impact on acoustic propagation. They encourage the use of CCA for complex studies, in particular, for environments fluctuating under several environmental phenomena.
APA, Harvard, Vancouver, ISO, and other styles
29

McComas, Sarah, Stephen Arrowsmith, Chris Hayward, Brian Stump, and Mihan McKenna. "Low-frequency acoustic monitoring in urban environments." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A35. http://dx.doi.org/10.1121/10.0010573.

Full text
Abstract:
Arrays of infrasound sensors are commonly deployed in quiet rural settings to monitor high energy/low-frequency sources at distances of hundreds to thousands of kilometers. Advancements in infrasound sensor technology allow for measurement across the acoustic spectrum from infrasound (< 20 Hz) to low end audible (< 1000 Hz). This supports a growing interest in using infrasound arrays to monitor low energy/higher frequency sources at local propagation distances (<100 km). Examples of these sources include vehicles (ground and air), small explosions, and infrastructure (e.g., bridges). Many of these sources are driven by anthropogenic activity. In order to successfully monitor them, arrays of sensors will need to be installed closer to the sources of interest, thereby requiring arrays to encroach on urban spaces. The design, deployment, and utilization of these arrays will face challenges, such as limited open ground for installation and source signals that need to be separated from a complex acoustic noise field to be observed. This presentation shares techniques for instrumenting the urban environment and characterizing the ambient acoustic fields in three different urban environments. [Permission to publish was granted by the Director, Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center.]
APA, Harvard, Vancouver, ISO, and other styles
30

Dorman, Michael F., and Rene H. Gifford. "Speech Understanding in Complex Listening Environments by Listeners Fit With Cochlear Implants." Journal of Speech, Language, and Hearing Research 60, no. 10 (October 17, 2017): 3019–26. http://dx.doi.org/10.1044/2017_jslhr-h-17-0035.

Full text
Abstract:
PurposeThe aim of this article is to summarize recent published and unpublished research from our 2 laboratories on improving speech understanding in complex listening environments by listeners fit with cochlear implants (CIs).MethodCI listeners were tested in 2 listening environments. One was a simulation of a restaurant with multiple, diffuse noise sources, and the other was a cocktail party with 2 spatially separated point sources of competing speech. At issue was the value of the following sources of information, or interventions, on speech understanding: (a) visual information, (b) adaptive beamformer microphones and remote microphones, (c) bimodal fittings, that is, a CI and contralateral low-frequency acoustic hearing, (d) hearing preservation fittings, that is, a CI with preserved low-frequency acoustic in the same ear plus low-frequency acoustic hearing in the contralateral ear, and (e) bilateral CIs.ResultsA remote microphone provided the largest improvement in speech understanding. Visual information and adaptive beamformers ranked next, while bimodal fittings, bilateral fittings, and hearing preservation provided significant but less benefit than the other interventions or sources of information. Only bilateral CIs allowed listeners high levels of speech understanding when signals were roved over the frontal plane.ConclusionsThe evidence supports the use of bilateral CIs and hearing preservation surgery for best speech understanding in complex environments. These fittings, when combined with visual information and microphone technology, should lead to high levels of speech understanding by CI patients in complex listening environments.Presentation Videohttp://cred.pubs.asha.org/article.aspx?articleid=2601622
APA, Harvard, Vancouver, ISO, and other styles
31

Gunderson, Aaron. "3D finite element modeling techniques and application to underwater target scattering." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A54. http://dx.doi.org/10.1121/10.0010637.

Full text
Abstract:
Underwater acoustic target scattering measurements rely on high-fidelity modeling for experimental comparison and understanding. Three-dimensional (3D) finite element models are well suited for this purpose, as they can account for arbitrary or unknown target properties and configurations/orientations within complex and asymmetrical seafloor environments. High acoustic frequencies and large physical distances associated with in situ scattering measurements pose challenges to 3D modeling efforts in terms of model sizes and runtimes. Certain model considerations must be made to keep the 3D model computationally efficient, yet accurate in predictive capability. Numerically determined Green’s functions are demonstrated to permit 3D model reduction, while still preserving far-field scattering prediction capability through the Helmholtz–Kirchhoff integral. By determining Green’s functions within the model, they need not be known or estimated for complex ocean environments a priori. Nontraditional scattering formulations and a survey of boundary truncation methods also are explored and implemented for maximal accuracy within small 3D computational domains. Model results for canonical elastic targets within varying seafloor environments are shown and compared to theory and experimentation. [Work supported by the Strategic Environmental Research and Development Program and by the Office of Naval Research, Ocean Acoustics.]
APA, Harvard, Vancouver, ISO, and other styles
32

Kukshtel, Natalie, Ying-Tsong Lin, Andone C. Lavery, Scott Loranger, Jason Chaytor, and Glen Gawarkiewicz. "Sound propagation measurements using an autonomous underwater vehicle acoustic array in the New England shelf break acoustics network." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A27. http://dx.doi.org/10.1121/10.0015425.

Full text
Abstract:
The New England shelf break is a highly dynamic region, which experiences complex spatial and temporal water-column variations due to interactions with warm core rings originating from the gulf stream. This widely varying ocean environment leads to changes in sound speed and acoustic propagation. Acoustic payload-equipped autonomous underwater vehicles (AUVs) are advantageous for sound propagation measurements in such environments due to their ability to detect changes with greater spatial resolution compared to fixed moorings. An AUV-towed acoustic array was tested and deployed in the New England Shelf Break Acoustics (NESBA) experiment in May 2021. The acoustic AUV system was comprised of a modified REMUS 600 vehicle, a hull-mounted 3.5 kHz transducer, and a towed multi-channel linear hydrophone array. The AUV sound source was tested at the Dodge Pond Naval Facility to characterize the effect of AUV body resonance, and the resulting calibration was incorporated into the data processing. Propagation paths between the AUV, acoustic moorings, and a ship-towed sound source were studied to investigate the acoustic effects of varying physical oceanographic conditions and biological scattering layers. These measurements also enabled investigation of the local seabed conditions and sub-bottom layering structure. [Work supported by the Office of Naval Research.]
APA, Harvard, Vancouver, ISO, and other styles
33

Jiang, Ling-Wen, Ming-Song Zou, Shu-Xiao Liu, and He Huang. "Calculation method of acoustic radiation for floating bodies in shallow sea considering complex ocean acoustic environments." Journal of Sound and Vibration 476 (June 2020): 115330. http://dx.doi.org/10.1016/j.jsv.2020.115330.

Full text
APA, Harvard, Vancouver, ISO, and other styles
34

Allen, John S. "Ambient acoustic enviroment—Diurnal soundscapes." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A270. http://dx.doi.org/10.1121/10.0016242.

Full text
Abstract:
Soundscape ecology has emerged as an important technique for monitoring complex coastal environments. Spatial and temporal acoustic variability exists between different regions and habitats. The sound characteristics have been hypothesized to be related to the associated community’s diversity and health. The prominent sounds may originate from physical, biological, and anthropogenic sources. Biological sounds especially those at coral reefs locations may have seasonal, monthly and diurnal variations. Snapping shrimp noise can dominate the ambient noise background in these sub-tropical coastal regions. While seasonal variations of snapping shrimp sounds have been studied extensively, the diurnal variations across habitats are less understood. Ambient noise data from two sites on Oahu, Hawaii are investigated with respect to diurnal variations using both spectral and time series analysis. Motivations and inspirations from Dr. Lisa Zurk’s extensive work on passive acoustics are highlighted. In addition, Dr. Zurk made notable theoretical and numerical contributions to acoustic scattering research. Some recent studies on the scattering from gas bubbles in complex media are also outlined in tribute.
APA, Harvard, Vancouver, ISO, and other styles
35

Zündorf, Ida C., Hans-Otto Karnath, and Jörg Lewald. "The effect of brain lesions on sound localization in complex acoustic environments." Brain 137, no. 5 (March 10, 2014): 1410–18. http://dx.doi.org/10.1093/brain/awu044.

Full text
APA, Harvard, Vancouver, ISO, and other styles
36

Anderson, Brady J., Natalie Sullivan, Dolly A. Sanjinez, Samantha Hamner, and Timothy E. Doyle. "Creating complex, controllable environments for scaffold-free tissue engineering using acoustic levitation." Journal of the Acoustical Society of America 141, no. 5 (May 2017): 4015. http://dx.doi.org/10.1121/1.4989227.

Full text
APA, Harvard, Vancouver, ISO, and other styles
37

Kerber, Stefan, and Bernhard U. Seeber. "A test battery to assess localization ability in simulated complex acoustic environments." Journal of the Acoustical Society of America 127, no. 3 (March 2010): 1809. http://dx.doi.org/10.1121/1.3384105.

Full text
APA, Harvard, Vancouver, ISO, and other styles
38

Liu, Peng-fei, Jun Yang, and Xiong-qi Peng. "Delamination analysis of carbon fiber composites under hygrothermal environment using acoustic emission." Journal of Composite Materials 51, no. 11 (August 10, 2016): 1557–71. http://dx.doi.org/10.1177/0021998316661043.

Full text
Abstract:
Non-destructive test technique for monitoring delamination failure under complex load and environments is still not mature until now. The purpose of this paper is to study mixed-mode delamination failure properties of carbon fiber/epoxy composite laminates under hygrothermal environment using acoustic emission. Different water-saturated composite specimens with initial intralaminar and interlaminar defects are tested. Two loading modes including single-leg and over-leg three-point bending are applied under hygrothermal environment. By analyzing the responses of acoustic emission parameters including amplitude and energy, the effects of the hygrothermal environment, layup pattern and initial defect on the delamination behaviors of composite specimens are studied. Besides, different failure modes are observed through scanning electron microscope. Quantitative acoustic emission results show hygrothermal environment and load mode affect the delamination properties of composites remarkably.
APA, Harvard, Vancouver, ISO, and other styles
39

Lončar, Ivan, Anja Babić, Barbara Arbanas, Goran Vasiljević, Tamara Petrović, Stjepan Bogdan, and Nikola Mišković. "A Heterogeneous Robotic Swarm for Long-Term Monitoring of Marine Environments." Applied Sciences 9, no. 7 (April 2, 2019): 1388. http://dx.doi.org/10.3390/app9071388.

Full text
Abstract:
This paper describes an underwater acoustic sensor network consisting of a heterogeneous robotic swarm used for long-term monitoring of underwater environments. The swarm consists of a large number of underwater robots acting as sensor nodes with limited movement capabilities, and a few surface robots aiding them in accomplishing underwater monitoring scenarios. Main interactions between two types of robots include underwater sensor deployment and relocation, energy and data exchange, and acoustic localisation aiding. Hardware capabilities of each vehicle are described in detail. Inter-agent communication is split into two layers: surface and underwater communication. Surface communication utilises wireless communication using WiFi routers configured for decentralised routing. Underwater communication mainly uses acoustic communication which, when used within a large swarm, poses a challenging task because of high probability of interference and data loss. The acoustic communication protocol used to prevent these issues is presented in detail. Finally, more complex functionalities of the robotic swarm are presented, including several results from real-life experiments.
APA, Harvard, Vancouver, ISO, and other styles
40

Du, Xiaohui. "Investigation of indoor environment comfort in large high-speed railway stations in Northern China." Indoor and Built Environment 29, no. 1 (May 3, 2019): 54–66. http://dx.doi.org/10.1177/1420326x19842299.

Full text
Abstract:
The indoor environment of high-speed railway stations is more complex than in traditional railway stations. This could lead to complex indoor environment problems. In this study, indoor environmental measurements and passenger satisfaction surveys were conducted in two high-speed railway stations in summer and winter, considering the indoor thermal, natural light, acoustic and air environment. The results indicate that the air temperatures in winter were far below comfort standards. The mean illuminance met the standard requirements in both stations. However, the illuminance uniformity was very low in the summer. The acoustic and air environments were satisfactory and have positive impacts on the overall environmental comfort of passengers. The evaluated acoustic environment indicated this has a worst effect on passengers’ comfort. The depth of the waiting halls affected the air environment. The subjective survey revealed the following: Females were more sensitive to the indoor environment than males in winter. Northerners were more satisfied with the environment than Southerners. Older passengers were slightly more tolerant to the environment. Passengers with a longer waiting time would have higher demands for a better indoor environment. Also, passengers were more tolerant in summer than in winter.
APA, Harvard, Vancouver, ISO, and other styles
41

Aspeslagh, Sofie, Fraser Clark, Michael A. Akeroyd, and W. O. Brimijoin. "Measuring rapid adaptation to complex acoustic environments in normal and hearing-impaired listeners." Journal of the Acoustical Society of America 137, no. 4 (April 2015): 2229. http://dx.doi.org/10.1121/1.4920127.

Full text
APA, Harvard, Vancouver, ISO, and other styles
42

Baresch, Diego, and Valeria Garbin. "Acoustic manipulation and actuation of bubbles in complex environments: Beyond the Bjerknes force." Journal of the Acoustical Society of America 144, no. 3 (September 2018): 1933. http://dx.doi.org/10.1121/1.5068462.

Full text
APA, Harvard, Vancouver, ISO, and other styles
43

Eaton, M., M. Pearson, W. Lee, and R. Pullin. "Accurate Damage Location in Complex Composite Structures and Industrial Environments using Acoustic Emission." Journal of Physics: Conference Series 628 (July 9, 2015): 012105. http://dx.doi.org/10.1088/1742-6596/628/1/012105.

Full text
APA, Harvard, Vancouver, ISO, and other styles
44

Iyer, Nandini, Eric Thompson, Kelly Stillwagon, Zachariah Ennis, Abbey Willis, and Brian Simpson. "Adaptive speech modifications and its effect on communication effectiveness in complex acoustic environments." Journal of the Acoustical Society of America 140, no. 4 (October 2016): 3437. http://dx.doi.org/10.1121/1.4971074.

Full text
APA, Harvard, Vancouver, ISO, and other styles
45

Wang, Xiaoyu, Xiaohua Wang, Rongkun Jiang, Weijiang Wang, Qu Chen, and Xinghua Wang. "Channel Modelling and Estimation for Shallow Underwater Acoustic OFDM Communication via Simulation Platform." Applied Sciences 9, no. 3 (January 28, 2019): 447. http://dx.doi.org/10.3390/app9030447.

Full text
Abstract:
The performance of underwater acoustic (UWA) communication is heavily dependent on channel estimation, which is predominantly researched by simulating UWA channels modelled in complex and dynamic underwater environments. In UWA channels modelling, the measurement-based approach provides an accurate method. However, acquirement of environment data and simulation processes are scenario-specific and thus not cost-effective. To overcome such restraints, this article proposes a comprehensive simulation platform that combines UWA channel modelling with orthogonal frequency division multiplexing (OFDM) channel estimation, allowing users to model UWA channels for different ocean environments and simulate channel estimation with configurable input parameters. Based on the simulation platform, three independent
APA, Harvard, Vancouver, ISO, and other styles
46

van de Par, Steven, Stephan D. Ewert, Lubos Hladek, Christoph Kirsch, Julia Schütze, Josep Llorca-Bofí, Giso Grimm, Maartje M. E. Hendrikse, Birger Kollmeier, and Bernhard U. Seeber. "Auditory-visual scenes for hearing research." Acta Acustica 6 (2022): 55. http://dx.doi.org/10.1051/aacus/2022032.

Full text
Abstract:
While experimentation with synthetic stimuli in abstracted listening situations has a long standing and successful history in hearing research, an increased interest exists on closing the remaining gap towards real-life listening by replicating situations with high ecological validity in the lab. This is important for understanding the underlying auditory mechanisms and their relevance in real-life situations as well as for developing and evaluating increasingly sophisticated algorithms for hearing assistance. A range of ‘classical’ stimuli and paradigms have evolved to de-facto standards in psychoacoustics, which are simplistic and can be easily reproduced across laboratories. While they ideally allow for across laboratory comparisons and reproducible research, they, however, lack the acoustic stimulus complexity and the availability of visual information as observed in everyday life communication and listening situations. This contribution aims to provide and establish an extendable set of complex auditory-visual scenes for hearing research that allow for ecologically valid testing in realistic scenes while also supporting reproducibility and comparability of scientific results. Three virtual environments are provided (underground station, pub, living room), consisting of a detailed visual model, an acoustic geometry model with acoustic surface properties as well as a set of acoustic measurements in the respective real-world environments. The current data set enables i) audio–visual research in a reproducible set of environments, ii) comparison of room acoustic simulation methods with “ground truth” acoustic measurements, iii) a condensation point for future extensions and contributions for developments towards standardized test cases for ecologically valid hearing research in complex scenes.
APA, Harvard, Vancouver, ISO, and other styles
47

Leão, Dalila T., Emygdio L. A. Monteiro-Filho, and Flávio J. L. Silva. "Acoustic parameters of sounds emitted by Sotalia guianensis : dialects or acoustic plasticity." Journal of Mammalogy 97, no. 2 (December 27, 2015): 611–18. http://dx.doi.org/10.1093/jmammal/gyv208.

Full text
Abstract:
Abstract Selective pressure from the environment on species may select adaptations as a whole, including the specific context of acoustics. Some authors report that the acoustic repertoire of Sotalia guianensis presents dialects as a geographical reflection. However, others propose that the environmental characteristics are the factor that imposes these variations. The present study evaluated if S. guianensis modifies its sound emissions at the Curral Cove (CC) and the Guaraíras Lagoon Complex (GLC), different habitats at similar latitudes. At the GLC, dolphins use higher whistle frequencies as well as higher number of click per second, facts that may be related to sound precision for communication between individuals and prey capture. Variations in the dolphins’ sounds may be related to differences in the environments such as natural background noise—biotic and abiotic—and characteristics such as turbidity, temperature, salinity, and modification in sound propagation due to depth and bottom properties. The pulsed calls’ sound category did not present modification between habitats probably due to context in which they are used since they occur during high physical contact. It is possible that the variation of the sound parameters between the CC and GLC environments is a reflection of the species’ adaptive potential, since a population can adjust the sounds emitted by its individuals to the environment’s features, revealing acoustic plasticity. A pressão seletiva do ambiente sobre as espécies ali viventes pode selecionar adaptações como um todo, inclusive no contexto acústico específico. Alguns autores relatam que o repertório acústico de Sotalia guianensis apresenta dialetos como reflexo geográfico; entretanto, outros autores propõem que as características do ambiente são o fator que impõem essas variações. O presente estudo avaliou se S. guianensis modifica suas emissões sonoras entre a Enseada do Curral (CC) e o Complexo Lagunar de Guaraíras (GLC), habitats diferentes localizados em latitudes semelhantes. No GLC, os golfinhos utilizam frequências mais altas de assobios assim como maior número de cliques por segundo, fatos que podem estar relacionados com a precisão dos sons para a comunicação entre indivíduos e a captura de presas. As variações nos sons dos golfinhos podem estar relacionadas às diferenças nos ambientes, como ruídos de fundo naturais—bióticos e abióticos—características como turbidez, temperatura e salinidade; e modificação da propagação do som devido profundidade e propriedades do fundo. A categoria sonora grito não apresentou modificação entre os habitas provavelmente devido ao contexto em que são usados, pois ocorrem durante alto contato físico entre os indivíduos. É possível que a variação dos parâmetros sonoros entre os ambientes de CC e GLC seja reflexo do potencial adaptativo da espécie, pois uma mesma população pode ajustar os sons emitidos pelos seus indivíduos às características do ambiente revelando uma plasticidade acústica.
APA, Harvard, Vancouver, ISO, and other styles
48

Lindwall, Dennis. "3D underwater imaging using vector acoustic sensors." GEOPHYSICS 73, no. 1 (January 2008): Q1—Q7. http://dx.doi.org/10.1190/1.2813347.

Full text
Abstract:
Marine surveys that use vector acoustic sensors may allow for 3D imaging of underwater environments with a much smaller amount of data than current 3D hydrophone surveys. Newly developed sensors make vector-acoustic-based surveys practical. This concept is demonstrated with data from a three-axis accelerometer and a collocated hydrophone in an acoustic water tank using a short-pulse source and passive scattering targets. One algorithm rectifies the vector data with scalar pressure data and another maps the vector data into a 3D volume, showing several slices of the volume images. The imaging algorithm maps the scattered energy using the direction and traveltime independently for each source-receiver pair rather than using the phase coherence methods common in exploration seismology. Imaging a more complex and realistic marine environment requires vector wavefield decomposition techniques and other theoretical developments but may allow for 3D vector-acoustic seismic surveys using logistics similar to 2D surveys that use conventional hydrophones.
APA, Harvard, Vancouver, ISO, and other styles
49

Li, Juan, Baoxiang Wang, Xuerong Cui, Shibao Li, and Jianhang Liu. "Underwater Acoustic Target Recognition Based on Attention Residual Network." Entropy 24, no. 11 (November 15, 2022): 1657. http://dx.doi.org/10.3390/e24111657.

Full text
Abstract:
Underwater acoustic target recognition is very complex due to the lack of labeled data sets, the complexity of the marine environment, and the interference of background noise. In order to enhance it, we propose an attention-based residual network recognition method (AResnet). The method can be used to identify ship-radiated noise in different environments. Firstly, a residual network is used to extract the deep abstract features of three-dimensional fusion features, and then a channel attention module is used to enhance different channels. Finally, the features are classified by the joint supervision of cross-entropy and central loss functions. At the same time, for the recognition of ship-radiated noise in other environments, we use the pre-training network AResnet to extract the deep acoustic features and apply the network structure to underwater acoustic target recognition after fine-tuning. The two sets of ship radiation noise datasets are verified, the DeepShip dataset is trained and verified, and the average recognition accuracy is 99%. Then, the trained AResnet structure is fine-tuned and applied to the ShipsEar dataset. The average recognition accuracy is 98%, which is better than the comparison method.
APA, Harvard, Vancouver, ISO, and other styles
50

Geipel, Inga, Kirsten Jung, and Elisabeth K. V. Kalko. "Perception of silent and motionless prey on vegetation by echolocation in the gleaning bat Micronycteris microtis." Proceedings of the Royal Society B: Biological Sciences 280, no. 1754 (March 7, 2013): 20122830. http://dx.doi.org/10.1098/rspb.2012.2830.

Full text
Abstract:
Gleaning insectivorous bats that forage by using echolocation within dense forest vegetation face the sensorial challenge of acoustic masking effects. Active perception of silent and motionless prey in acoustically cluttered environments by echolocation alone has thus been regarded impossible. The gleaning insectivorous bat Micronycteris microtis however, forages in dense understory vegetation and preys on insects, including dragonflies, which rest silent and motionless on vegetation. From behavioural experiments, we show that M. microtis uses echolocation as the sole sensorial modality for successful prey perception within a complex acoustic environment. All individuals performed a stereotypical three-dimensional hovering flight in front of prey items, while continuously emitting short, multi-harmonic, broadband echolocation calls. We observed a high precision in target localization which suggests that M. microtis perceives a detailed acoustic image of the prey based on shape, surface structure and material. Our experiments provide, to our knowledge, the first evidence that a gleaning bat uses echolocation alone for successful detection, classification and precise localization of silent and motionless prey in acoustic clutter. Overall, we conclude that the three-dimensional hovering flight of M. microtis in combination with a frequent emission of short, high-frequency echolocation calls is the key for active prey perception in acoustically highly cluttered environments.
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography