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1
Masih, Dawa A. A., Nawzad K. Jalal, Manar N. A. Mohammed, and Sulaiman A. Mustafa. "The Assessment of Acoustical Characteristics for Recent Mosque Buildings in Erbil City of Iraq." ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY 9, no. 1 (2021): 51–66. http://dx.doi.org/10.14500/aro.10784.
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The study of mosque acoustics, concerning acoustical features, sound quality for speech intelligibility, and additional practical acoustic criteria, is commonly overlooked. Acoustic quality is vital to the fundamental use of mosques, in terms of contributing toward prayers and worshippers’ appreciation. This paper undertakes a comparative analysis of the acoustic quality level and the acoustical characteristics for two modern mosque buildings constructed in Erbil city. This work investigates and examines the acoustical quality and performance of these two mosques and their prayer halls through room simulation using ODEON Room Acoustics Software, to assess the degree of speech intelligibility according to acoustic criteria relative to the spatial requirements and design guidelines. The sound pressure level and other room-acoustic indicators, such as reverberation time (T30), early decay time, and speech transmission index, are tested. The outcomes demonstrate the quality of acoustics in the investigated mosques during semi-occupied and fully-occupied circumstances. The results specify that the sound quality within the both mosques is displeasing as the loudspeakers were off.
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van der Harten, Arthur W., and David Kahn. "Sound transparent assemblies in concert halls: Using simulation to balance acoustics and design aesthetic." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A348. http://dx.doi.org/10.1121/10.0019113.
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Variable acoustics finishes are often incorporated into concert halls to allow adjustment to the liveness of the space. Therefore. the visual appearance of the hall changes, depending on the settings of those variable acoustics finishes. Architects often prefer a consistent visual appearance, regardless of the positioning of those variable acoustics finishes. Acoustic Distinctions has made an effort to determine the relationship between visual opacity and sound transparency in order to facilitate a more successful collaboration between architect and acoustician without any compromise or guesswork in the acoustical impact of these finishes. This paper discusses several concert halls that incorporate sound transparent surfaces to hide variable acoustics finishes behind. We cite previous work done by Acoustic Distinctions and the University of Hartford to test and verify sound transparent construction and introduce more recent work using the Finite Volume Method to determine acceptability of sound transparent construction, and to inform application to larger geometrical acoustics models.
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Arnold, Eliot. "Advancements in nanotechnology for acoustic management in pickleball." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A328. http://dx.doi.org/10.1121/10.0027695.
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This research investigates the use of advanced nano-fiber technology for sound and noise management in pickleball courts. The technology, known for its flexibility and adaptability, addresses the unique acoustic challenges of pickleball, a sport with a distinctive noise profile characterized by impulsive and unpredictable sounds. These nano-fibers are particularly effective in absorbing mid to high-frequency noises (800–5000 Hz) common in pickleball. Incorporating these nano-fibers into acoustic foams and textiles significantly enhances sound absorption, allowing for thinner materials while doubling performance compared to conventional materials. These fibers, about 1/500th the diameter of human hair, have a high surface area to volume ratio, aiding in sound scattering and increased friction with air molecules. This structure enables the efficient transformation of sound energy into heat, which is then effectively dissipated. Aligned with the Acoustical Society of America's standards, this abstract emphasizes a scientific breakthrough in sports acoustics, contributing to the reduction in urban noise pollution. The study underscores the impact of cutting-edge material technology in improving environmental acoustics and community well-being.
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okcu, selen. "Realism analysis of synthesized healthcare sound environments." Journal of the Acoustical Society of America 152, no. 4 (2022): A182. http://dx.doi.org/10.1121/10.0015965.
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The acoustic qualities of healthcare sound environments can have significant influences on care providers’ ability to conduct critical sound tasks. Healthcare professionals constantly listen to the aural cues (e.g., alarms) and make critical decisions based on them. This study aims to assess the reliability of an open-source acoustical simulation tool in rendering healthcare providers’ auditory experience to enable the development of effective healthcare sound environments. The Pachyderm is developed as an open-source acoustical modeling and simulation plug-in for the Rhinoceros 3D-modeling platform commonly used by designers. The plug-in can compute various room acoustics metrics and generate auralizations by convolving anechoic recordings with the predicted acoustic signature of the architectural settings. While reliable predicted acoustic metrics are critical for iterative room-acoustics design studies, high fidelity auralizations can enable acoustic evaluations mainly based on critical listening and encourage collaboration between acoustical consultants, care providers and designers. The study introduces the findings of acoustic assessments including simulations and field measurements conducted in a new 14-bed adult medical-surgical inpatient unit at Milton S. Hershey Medical Center. The effectiveness is evaluated based on the deviation between the predicted and measured objective measures, and perceived differences between the auralizations and audio recordings assessed via listening tests.
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Woolworth, David S. "Architectural acoustics: Buildings and beyond." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A28. http://dx.doi.org/10.1121/10.0026671.
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Architectural acoustics not only covers buildings and the environment around them but also human perception of the acoustic environment, indoors and outdoors. As a technical committee of the acoustical society, our members are spread over research, academia, practitioners and industry. Architectural acoustics is not reserved for concert halls and opera houses but applies to all occupied spaces and has a direct impact on quality of life of any user of the space. Specific topics within the discipline include but are not limited to environmental sound, speech privacy, and speech intelligibility, simulated acoustic environments, annoyance, human hearing, airborne and structureborne noise, sound and impact isolation, loudspeakers and microphones, room acoustics, soundscape, and acoustical measurements. The technical committee on noise is often a cosponsor of specials sessions by the TCAA, as noise control via architectural means is common practice. This presentation will provide an overview of the TCAA and the field of architectural acoustics and provide examples of current research and projects of interest.
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Kumar, Sanjay, and Heow Pueh Lee. "Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances." Crystals 10, no. 8 (2020): 686. http://dx.doi.org/10.3390/cryst10080686.
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In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which are difficult to find in naturally available materials. The acoustic metamaterials have demonstrated excellent acoustical characteristics that paved a new pathway for researchers to develop effective solutions for a wide variety of multifunctional applications, such as low-frequency sound attenuation, sound wave manipulation, energy harvesting, acoustic focusing, acoustic cloaking, biomedical acoustics, and topological acoustics. This review provides an update on the acoustic metamaterials’ recent progress for simultaneous sound attenuation and air ventilation performances. Several variants of acoustic metamaterials, such as locally resonant structures, space-coiling, holey and labyrinthine metamaterials, and Fano resonant materials, are discussed briefly. Finally, the current challenges and future outlook in this emerging field are discussed as well.
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Santika, Beta Bayu, Haram Lee, Yunjin Lee, and Jin Yong Jeon. "Psychophysiological responses to changes in the acoustic design of concert halls." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 1 (2023): 7154–59. http://dx.doi.org/10.3397/in_2023_1072.
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This study examined the psychophysiological responses of listeners to changes in the acoustic environment design of a concert hall. The research focused on both general audiences and experts in order to analyze the design of the acoustic environment based on their psychological and physiological aspects. The study involved the measurement of architectural acoustics of the hall and sound source produced through auralization based on the impulse responses collected earlier and the acoustical parameters gathered for the analysis. Changes were implemented through a refurbishment condition by the alterations to finishing materials. The objective sound environment improvement was evaluated by analyzing the electroencephalogram response in relation to the highly evaluated acoustic environment of the hall and the sound condition from the existing acoustic environment. The study found significant changes in the area related to emotion, preference for the acoustic environment, fatigue through the HRV parameter, and EEG. The results confirmed that psychophysiological responses to changes in the acoustical design provide an objective evidence of better concert hall acoustics.
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LaBelle, Brandon. "Sharing Architecture: Space, Time and the Aesthetics of Pressure." Journal of Visual Culture 10, no. 2 (2011): 177–88. http://dx.doi.org/10.1177/1470412911402889.
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Exploring acoustic space, this article aims to supplement the practice of acoustic design by exposing other perspectives on sound’s relationship to space. Following Paul Carter’s notion of sonic ambiguity, the author contends that the idealized sonic image of acoustics eliminates the potentiality inherent to sound and listening as forces of relational intensity and differentiation. To draw out this tension, the article examines alternative forms of acoustics as appearing within the practice of sound art. Through eccentric and speculative design, sound art comes to demonstrate a vital addition to notions of acoustics; by creating heightened listening experiences that exceed the traditional concepts of fidelity, it cultivates forms of noise by integrating extreme volume and frequency, building fantastical architectures for their diffusion, and incorporating a dynamic understanding of psychoacoustics and perception. Through such elements, sound and space are brought together and deliver other forms of acoustical experience while hinting at potentialities for their application in environments outside the art situation. Works by such artists as Tao G. Vrhovec Sambolec and John Wynne provide a vibrant terrain for registering how sound comes to perform as spatial material.
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Futamura, Ryohei. "Differences in acoustic characteristics of hitting sounds in baseball games." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 3 (2023): 4550–56. http://dx.doi.org/10.3397/in_2022_0654.
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In sports, athletes use visual and auditory information to perform full-body exercises. Some studies reported that auditory information is an essential cue for athletes: They utilized auditory information to predict ball behavior and determine body movements. However, because athletes instinctively use situation-related sounds, there is no systematic methodology to improve auditory-based competitive ability. Few studies attempted to approach the utilization of sound in games from the perspective of acoustics, and the functional acoustical features have not been quantitatively revealed. Therefore, the objective of this study is to clarify the acoustical characteristics of auditory information to maximize its utilization in baseball games. In particular, to analyze the acoustical features of batted ball sounds that enhance defensive skills, we conducted acoustic measurements of batted ball sounds in realistic situations. The results showed that the peak gain values of fly and liner batted balls were greater than those of grounder, and the frequency components included in the hitting sound were also different among them.
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Kamisiński, Tadeusz, Krzysztof Brawata, Adam Pilch, Jarosław Rubacha, and Marcin Zastawnik. "Sound Diffusers with Fabric Covering." Archives of Acoustics 37, no. 3 (2012): 317–22. http://dx.doi.org/10.2478/v10168-012-0040-5.
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Abstract Fabric covering is often used by designers, as it can easily mask acoustic structures that do not match an interior. However, in the case of sound diffusers based on change in the phase of the reflected wave, the use of fabric covering is not without its effect on acoustics. It reduces the effectiveness of these structures and raises acoustic absorption. In the paper, the authors analyzed the acoustical properties of a selected fabric used to cover sound diffusers. Sound absorption and scattering coefficients for a system composed of sound diffusers and a fabric situated at different distances d were measured. The results were compared to the sound absorption predicted on the basis of Kuttruff’s and Mechel’s theoretical models. Analysis of the results indicates that the fabric has a significant influence on the system’s acoustic parameters. It is also observed, that fabric applied directly on a phase grating diffuser, produces higher absorption than when it is at some distance from it.
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Woszczyk, Wieslaw, Richard King, Ying-Ying Zhang, and Aybar Aydin. "Virtual acoustics in a modern recording studio." Journal of the Acoustical Society of America 152, no. 4 (2022): A104. http://dx.doi.org/10.1121/10.0015689.
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Acoustical designs of recording studios have evolved over several decades to accommodate changes in the recording process/practice and in the available footprint of real estate. In many cases, special rooms were added to optimize acoustics for specific purpose: drum rooms, piano rooms, vocal rooms, reverb chambers, serving to isolate sounds and thus achieve better control of balance, auditory perspective, and sound color in recording. Today, workstations, plugins, and virtual acoustics setup allow for a replacement of the traditional design of a recording studio with one incorporating virtual acoustics that puts lesser demands on real estate. The talk will present a modern approach to 3D recording based on virtual assets that permits both simultaneous and sequential processes in recording of music while maximizing creative flexibility and acoustic experiences of artists.
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Boot, Tim, Frederic Roskam, Phil Coleman, Simon Brown, and Julien Laval. "Greater artistic and technological performance through the converged technologies of architectural acoustics, electroacoustic enhancement, and immersive audio technologies." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A168. http://dx.doi.org/10.1121/10.0023155.
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Producing meaningful, creative, and engaging experiences for audiences requires highly integrated acoustics and audio technologies. The fields of architectural acoustics, electro acoustic enhancement and immersive audio technologies have converged, altering the way we approach entertainment venue design. Globally, demand has increased for immersive audio in live and reproduced sound, and electro acoustic enhancement technologies are becoming more widespread. We will discuss how architecturally integrated end devices, multi-function signal processing, and architectural acoustical design should be optimized to create next-generation performance venues. We will use a project example that integrates sound system, acoustic enhancement, and architectural acoustics, illustrating how increasing clarity in audience with acoustic enhancement and supporting the immersive audio increases audience engagement. We will show what can be improved to elevate the experience in a converged approach. The paper will illustrate how a convergence of audio technologies, infrastructure, and a unified design and engineering processes is creating far greater opportunities for artistic experimentation and expression.
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Shafiro, Valeriy. "Environmental sound research today: Perception, cognition, applications." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A363. http://dx.doi.org/10.1121/10.0019171.
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Environmental sounds, defined as semantically rich acoustic signals different from speech or music, are ubiquitous in daily living. Environmental sound research in various forms has been long embedded into many areas of acoustics including noise control, bioacoustics, music, signal processing, speech communication, and psychoacoustics. However, environmental sounds have been typically investigated in the limited context of specific lines of inquiry unique to each of these areas. In this fractured research landscape, there is also a growing body of work which focuses on ecological aspects and elucidates the neurobiological bases of environmental sound perception and cognition. We will review main questions addressed in recent work, including existing theoretical and methodological challenges and opportunities, and suggest directions for developing a more comprehensive framework for future environmental sound research and applications. A better understanding of environmental sound perception and cognition can in turn have practical implications for many diverse areas of acoustics and related fields.
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Luzzi, Sergio, Chiara Bartalucci, Sara Delle Macchie, Rosella Natale, and Paola Pulella. "THE INTERNATIONAL YEAR OF SOUND INITIATIVES FOR WORLDWIDE AWARENESS ABOUT THE IMPORTANCE OF SOUND." VOLUME 39, VOLUME 39 (2021): 135. http://dx.doi.org/10.36336/akustika202139135.
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The International Year of Sound is a global initiative promoted by UNESCO Charter of Sound 39C/59 2017: “The Importance of Sound in Today’s World: Promoting Best Practices”. It consists of coordinated activities on regional, national, and international levels, organized by the International Commission for Acoustics. These activities aim to stimulate the understanding of the importance of sound in all aspects of our society throughout the world. In this paper, the aim of the International Year of Sound is described, together with the organization of activities and planned initiatives. Despite the pandemic context has caused the rescheduling of most of the events, the International Year of Sound has been going on, thanks to the awareness-raising projects of the National Commissions for Acoustics. A particular focus on “My world of sounds”, the International Competition for students, has been done. As a matter of fact, it has been observed that the awareness of younger generations plays a crucial role in the spread of correct acoustic behaviours.
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Berg, Frederick S., James C. Blair, and Peggy V. Benson. "Classroom Acoustics." Language, Speech, and Hearing Services in Schools 27, no. 1 (1996): 16–20. http://dx.doi.org/10.1044/0161-1461.2701.16.
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Classroom acoustics are generally overlooked in American education. Noise, echoes, reverberation, and room modes typically interfere with the ability of listeners to understand speech. The effect of all of these acoustical parameters on teaching and learning in school needs to be researched more fully. Research has shown that these acoustical problems are commonplace in new as well as older schools, and when carried to an extreme, can greatly affect a child's ability to understand what is said (Barton, 1989; Blair, 1990; Crandell, 1991; Finitzo, 1988). The precise reason for overlooking these principles needs to be studied more fully. Recently, however, acoustic principles have been clarified, and technologies for measuring room acoustics and providing sound systems have become available to solve many of the acoustical problem in classrooms (Berg, 1993; Brook, 1991; D'Antonio, 1989; Davis & Davis, 1991; Davis & Jones, 1989; Eargle, 1989; Egan, 1988; Everest, 1987, 1989; Foreman, 1991; Hedeen, 1980). This article describes parameters of the problem, its impact on students and teachers, and four possible solutions to the problem. These solutions are noise control, signal control without amplification, individual amplification systems, and sound field amplification systems.
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Godin, Oleg A., and Kay L. Gemba. "Graduate programs in physical, engineering, and underwater acoustics at the Naval Postgraduate School." Journal of the Acoustical Society of America 152, no. 4 (2022): A122. http://dx.doi.org/10.1121/10.0015752.
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The Departments of Physics and of Electrical and Computer Engineering at the Naval Postgraduate School offer graduate programs in acoustics leading to MS and PhD degrees in applied physics and engineering acoustics. Engineering acoustics degrees can be completed in either traditional or distance learning modes. The departments also offer stand-alone academic certificate programs in fundamentals of engineering acoustics, underwater acoustics, and sonar system applications, with a set of three certificates leading to a MS degree in engineering acoustics. MS and PhD programs are interdisciplinary, with courses and laboratory work drawn principally from the fields of physics and electrical engineering. Subjects covered include waves and oscillations; fundamentals of physical and structural acoustics; the generation, propagation, and reception of sound in the ocean; civilian and military applications of sonar systems; and acoustic signal processing. Topics of recent theses and dissertations include development and field testing of novel sensors for atmospheric and ocean acoustics, modeling and measurements of ambient noise and sound propagation in the ocean, sound scattering in underwater waveguides, acoustic vector sensors and vector field properties, acoustic communications, noise interferometry, time reversal in acoustics, geo-acoustic inversion, acoustic remote sensing of the ocean, and acoustics of autonomous underwater and aerial vehicles.
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Worcester, Peter F., Mohsen Badiey, and Hanne Sagen. "Introduction to the special issue on ocean acoustics in the changing arctic." Journal of the Acoustical Society of America 151, no. 4 (2022): 2787–90. http://dx.doi.org/10.1121/10.0010308.
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This paper introduces the Special Issue of The Journal of the Acoustical Society of America on Ocean Acoustics in the Changing Arctic. The special issue includes papers on ocean (and in one case atmospheric) acoustics. Changes in both the ice cover and ocean stratification have significant implications for acoustic propagation and ambient sound. The Arctic is not done changing, and papers in this special issue, therefore, represent a snapshot of current acoustic conditions in the Arctic.
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Barnard, Andrew, and Daniel A. Russell. "The graduate program in acoustics at Penn State." Journal of the Acoustical Society of America 152, no. 4 (2022): A124. http://dx.doi.org/10.1121/10.0015762.
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The Graduate Program in Acoustics at Penn State offers graduate degrees (M.Eng., M.S., Ph.D.) in Acoustics, with courses and research opportunities in a wide variety of subfields. Our 820 alumni are employed around the world in a wide variety of military and government labs, academic institutions, consulting firms, and consumer audio and related industries. Our 40+ faculty from several disciplines conduct research and teach courses in structural acoustics, nonlinear acoustics, architectural acoustics, signal processing, aeroacoustics, biomedical ultrasound, transducers, computational acoustics, noise and vibration control, acoustic metamaterials, psychoacoustics, and underwater acoustics. Course offerings include fundamentals of acoustics and vibration, electroacoustic transducers, signal processing, acoustics in fluid media, sound and structure interaction, digital signal processing, experimental techniques, acoustic measurements and data analysis, ocean acoustics, architectural acoustics, noise control engineering, nonlinear acoustics, outdoor sound propagation, computational acoustics, biomedical ultrasound, flow induced noise, spatial sound and three-dimensional audio, and the acoustics of musical instruments. This poster highlights faculty research areas, laboratory facilities, student demographics, successful graduates, and recent enrollment and employment trends for the Graduate Program in Acoustics at Penn State.
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Agarwal, Vinayak, James Traer, and Joshua H. McDermott. "Human perception of impact sounds suggests auditory intuitive physics." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A307. http://dx.doi.org/10.1121/10.0027604.
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Upon hearing objects collide, humans can estimate many of the underlying physical attributes, such as the objects’ material and mass. Although the physics of sound generation are well established, the inverse problem that listeners must solve – of inferring physical parameters from sound – remains poorly understood. In this work, we show that humans leverage an understanding of acoustical physics to constrain their perceptual inferences, allowing them to disambiguate multiple object properties from a single impact sound. We derived a linear generative model of impact sounds, combining theoretical acoustics with empirically measured statistics of object resonances. We used an analysis-by-synthesis algorithm to infer mode parameters from recorded object impulse responses. We then fit distributions to these parameters, from which object impulse responses could be sampled. Perceptual experiments demonstrated that humans could judge material and mass from sound alone, even when both of the underlying objects varied. However, performance with synthetic sounds was impaired if the simulated physical regularities were altered to be unnatural. The results suggest that listeners use internal physical models to separate the acoustic contributions of the objects that interact to create sound.
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Barnard, Andrew, and Daniel A. Russell. "The Graduate Program in Acoustics at Penn State." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A253. http://dx.doi.org/10.1121/10.0027404.
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The Graduate Program in Acoustics at Penn State offers graduate degrees (M.Eng., M.S., Ph.D.) in Acoustics, with courses and research opportunities in a wide variety of subfields. Our 820 alumni are employed around the world in military and government labs, academic institutions, consulting firms, and consumer audio and related industries. Our 40 + faculty from several disciplines conduct research and teach courses in structural acoustics, nonlinear acoustics, architectural acoustics, signal processing, aeroacoustics, biomedical ultrasound, transducers, computational acoustics, noise and vibration control, acoustic metamaterials, psychoacoustics, and underwater acoustics. Course offerings include fundamentals of acoustics and vibration, electroacoustic transducers, signal processing, acoustics in fluid media, sound and structure interaction, digital signal processing, experimental techniques, acoustic measurements and data analysis, ocean acoustics, architectural acoustics, noise control engineering, nonlinear acoustics, outdoor sound propagation, computational acoustics, biomedical ultrasound, flow induced noise, spatial sound and three-dimensional audio, and the acoustics of musical instruments. Distance education students pursuing the M.Eng. degree join resident students in a hybrid classroom environment. This poster highlights faculty research areas, laboratory facilities, student demographics, successful graduates, and recent enrollment and employment trends.
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King, Richard, Wieslaw Woszczyk, and Michail Oikonomidis. "Enhancement of virtual acoustics rendering using boundary mounted dipole loudspeakers." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A177. http://dx.doi.org/10.1121/10.0027228.
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The Immersive Media Lab at McGill University hosts a Virtual Acoustics Technology (VAT) system incorporating a suspended array of omnidirectional loudspeakers. Using a convolution reverb engine, acoustic simulations of real spaces can be realized via a catalog of Room Impulse Response measurements. Reflected sound in the room helps to disguise the location of the sound emitters rendering virtual acoustics. One limitation of the system, however, is the interference between the lab’s natural acoustics and the virtual environment generated by the VAT system. The improvement under consideration is to enhance diffusion along the walls of the lab, in order to mask the acoustical characteristics related to the physical dimensions of the room. Dipole loudspeakers are installed on the room boundaries and used to scatter reflections and reverberation along the wall surfaces enlarging the effective radiation surface of the walls. The scattered energy may mask specular reflections and reduce localization of the virtual acoustic sources. Investigations compare the result of scattering reflected sound vertically as opposed to horizontally across the boundaries. Measurements illustrate the effect of the dipole loudspeaker system when used on its own as well as working in conjunction with the existing omnidirectional loudspeaker array.
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Hambric, Stephen A. "Practical tutorial on cylindrical structure vibro-acoustics Part 2 - Acoustics." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 3 (2023): 5850–60. http://dx.doi.org/10.3397/in_2023_0841.
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In part 1 of this tutorial (proceedings of Inter-noise 2022) I explained vibrations in cylindrical shell structures. In that paper I limited the mathematics and focused on the key behavior of shells based on critical parameters like the ring frequency, helical wavenumbers, and mean mobilities over different frequency ranges. I compared measured data to the simple theories. In part 2, I focus on the acoustics of cylindrical shells, including sound within shells and the sound radiated outside them. Exterior sound radiation depends strongly on the circumferential order of the shell modes. Breathing modes near the ring frequency radiate sound extremely well, but have very high impedances, so can be difficult to excite. Beam-like modes, where the entire shell cross-section vibrates transversely, radiate less efficiently, but can be easily driven. Higher order, or 'lobar' modes radiate even less efficiently, but nevertheless are commonly observed in radiated sound spectra due to their low impedances. I also review statistical estimates of radiation efficiency of groups of shell modes, which show clear peaks at both the ring frequency as well as at the critical frequency of bending waves. The mathematics of sound inside cylindrical shells is some of the most challenging in vibro-acoustics. At low frequencies, however, the interior sound is dominated by simple one-dimensional planar acoustic waves. At higher frequencies, the sound depends on how well a shell vibration field matches the interior acoustic field based on proximity of resonance frequencies and the similarity of mode shape orders, as well as the 'cut on' frequencies of higher order internal acoustic modes. Finally, I review the well-known phenomenon of how a low shell wall impedance can reduce the effective acoustic sound speed of one-dimensional waves inside cylindrical shells.
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Zhu, Liying, Junjuan Zhao, Xianhui Li, et al. "Design and simulation of acoustics for the home theatre." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 4 (2021): 2052–57. http://dx.doi.org/10.3397/in-2021-2039.
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As a typical acoustics room, the sound quality of home theatre is an important standard to evaluate its design. Qualified acoustics design is the guarantee of good sound quality. The volume of home theatre is generally small, so the room size is similar to the low-frequency wavelength. Then the resonance will occur when the excitation of the sound source frequency acts on the natural resonance frequency of the room. At the same time, the secondary reflection of the room also interferes the direct sound emitted by the speaker, thus destroying the sound image. In order to solve the above problems, this paper took a home theatre as an example, analyzed the normal modes of the room by the theory of wave acoustics, and then made an acoustics design and simulation. The simulation results showed that the reverberation time was up to the relevant standards and the room acoustic quality environment was improved obviously after the acoustic design.
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Novkovic, Dragan, Marko Peljevic, and Mateja Malinovic. "Synthesis and analysis of sounds developed from the Bose-Einstein condensate: Theory and experimental results." Muzikologija, no. 24 (2018): 95–109. http://dx.doi.org/10.2298/muz1824095n.
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Two seemingly incompatible worlds of quantum physics and acoustics have their meeting point in experiments with the Bose-Einstein Condensate. From the very beginning, the Quantum Music project was based on the idea of converting the acoustic phenomena of quantum physics that appear in experiments into the sound domain accessible to the human ear. The first part of this paper describes the experimental conditions in which these acoustic phenomena occur. The second part of the paper describes the process of sound synthesis which was used to generate final sounds. Sound synthesis was based on the use of two types of basic data: theoretical formulas and the results of experiments with the Bose-Einstein condensate. The process of sound synthesis based on theoretical equations was conducted following the principles of additive synthesis, realized using the Java Script and Max MSP software. The synthesis of sounds based on the results of experiments was done using the MatLab software. The third part or the article deals with the acoustic analysis of the generated sounds, indicating some of the acoustic phenomena that have emerged. Also, we discuss the possible ways of using such sounds in the process of composing and performing contemporary music.
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Vorländer, Michael. "Virtual Acoustics." Archives of Acoustics 39, no. 3 (2015): 307–18. http://dx.doi.org/10.2478/aoa-2014-0036.
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Abstract Virtual Reality (VR) systems are used in engineering, architecture, design and in applications of biomedical research. The component of acoustics in such VR systems enables the creation of audio-visual stimuli for applications in room acoustics, building acoustics, automotive acoustics, environmental noise control, machinery noise control, and hearing research. The basis is an appropriate acoustic simulation and auralization technique together with signal processing tools. Auralization is based on time-domain modelling of the components of sound source characterization, sound propagation, and on spatial audio technology. Whether the virtual environment is considered sufficiently accurate or not, depends on many perceptual factors, and on the pre-conditioning and immersion of the user in the virtual environment. In this paper the processing steps for creation of Virtual Acoustic Environments and the achievable degree of realism are briefly reviewed. Applications are discussed in examples of room acoustics, archeological acoustics, aircraft noise, and audiology.
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Russell, Daniel A. "Acoustics demonstration extravaganza." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A114. http://dx.doi.org/10.1121/10.0018346.
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The Education in Acoustics and Physical Acoustics committees are pleased to present an Acoustics Demonstration Extravaganza - a showcase of demonstrations and apparatus to inspire and challenge your understanding of acoustics and vibration phenomena. In the spirit of the “Circus of Acoustics” demonstration show from the June 2002 ASA 143 Pittsburgh meeting [J. Acoust. Soc., Am., 111, 5, Pt2, p. 2451, (2002) session 4pPAb] this session will consist of several short demonstrations covering a wide variety of acoustics and vibration topics. Among the demonstrations intended to be shown are the following (there may be some last-minute additions or substitutions depending on equipment and presenter availability): Simple Sound Sources: Directory patterns and frequency spectrum characteristics of monopole, dipole, and quadrupole sources, the pressure doubling effect of a baffle, and a beam-forming array. Radiation of Sound from Plates: Demonstration of the radiated intensity from various vibrational modes of a simply supported thin plate. Strings of Pearls: Modes of vibration for a N-DOF mass-spring system and standing waves on a compound string comprised of a two string segments with different densities. Burning Wire of Death: Standing waves on a nichrome wire carrying a high current so it glows red at nodes. The Song of the Singing Rod: The singing rod demonstration is commonly used to describe longitudinal waves in a free-free rod. However, if the length of the rod is adjusted just right, a nonlinear pulsating effect is observed resulting from modal coupling of transverse bending modes and either subharmonic longitudinal modes or torsional modes. Nonlinear Oscillations in a Membrane: A membrane is driven with a large amplitude, so the vibration becomes nonlinear. As the frequency sweeps up and then down, the amplitude jumps and follows a hysteresis loop characteristic of a stiffening nonlinear spring. Demonstration apparatus of the Cochlea (designed by Robert Keolian): A mechanical hydrodynamic analog model of the basilar membrane in the cochlea illustrating von Békésy's classical passive tonotopic traveling wave as an explanation of how the ear responds to different frequencies. Acoustic Resonator Rockets: A pair of lightweight Helmholtz Resonators, balanced on a pivot, will rotate when exposed to a loud amplitude sound at their resonance frequency. Acoustic Filters: An audible and visual demonstration of low-pass, high-pass, and band-stop acoustic filters using PVC pipes. Vocal Tract Models: A collection of short pipes with varying cross-sectional areas (designed by Takayuki Arai) that produce vowel sounds and may be used to model the acoustics of speech. Speed of Sound: A series of short demonstrations that illustrate the effect of temperature on the speed of sound in air, sound speed dependence on gas composition, and the effect of bubbles on the speed of sound in water. Fluid Loading of a Plate: A comparison of the vibration response of a vibrating plate, and the audibly radiated sound, when the plate is in air versus submerged in water. Rectangular Waveguide: Plane waves will propagate down a waveguide without decay at all frequencies, but non-plane wave modes will propagate only if driven above the cut-on frequency. When driven below the cut-on frequency, non-plane modes become evanescent and decay exponentially. Baseball Bat Piano: The hollow cylindrical barrels of metal and composite softball bats exhibit cylindrical shell vibrational modes. A collection of softball bats with hoop-mode frequencies corresponding to a musical scale may be played like a xylophone.
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Rosas-Pérez, Carmen, and Laurent Galbrun. "Human diversity in acoustics. Towards a more inclusive sound environment." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 1 (2023): 6117–27. http://dx.doi.org/10.3397/in_2022_0912.
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The study of human responses to sound generally recognises the great importance of taking into account the diversity existent in sounds and acoustics environments, but it rarely adopts the same approach with respect to the diversity in human beings and their responses, providing results as averages meant to represent the 'normal' response, and disregarding discrepancies as 'outliers'. In this paper, neurodiversity and autism is presented as part of the aural diversity factors that can lead to having different experiences of sounds, and an ongoing doctoral research project aiming at representing autistic people's experiences of the acoustic environment is introduced. Differences in perception of sounds can entail different challenges and needs, that are not currently contemplated in acoustics and soundscape research. The authors believe that all these aspects ought to be considered to widen our understanding of the field, to improve research and practice, and to create acoustic environments that are not just designed for a limited part of the population.
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Linsong, Li. "The influence of concert hall architecture on acoustics (the effect of musical performance)." E3S Web of Conferences 389 (2023): 06016. http://dx.doi.org/10.1051/e3sconf/202338906016.
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The article analyzes the influence of the architecture of the concert hall on acoustics and the formation of the effect of musical performance. The author notes that the architecture of a concert hall can be of great importance in providing an acoustic effect. In addition, the acoustics of a concert hall can influence how musicians perceive their playing and how the audience perceives the work. Some factors that may affect the acoustics of a concert hall include the shape and size of the hall, the materials used to finish the walls and ceiling, the location of the stage and audience seats, as well as acoustic equipment. The shape of the concert hall affects how sound waves are reflected inside the hall. An ideal concert hall should have a shape that allows sound waves to spread evenly in all directions and reflect off the walls and ceiling in such a manner that a uniform sound background is created. This helps to create clarity and clarity of sound. At the present stage, special software tools are used to simulate sound in the hall, experiments are carried out with various acoustic materials and the arrangement of elements in the hall, and experienced architects who have deep knowledge in the field of acoustics and sound engineering are also involved.
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Fırat, Hasan Baran. "Acoustics as Tangible Heritage: Re-embodying the Sensory Heritage in the Boundless Reign of Sight." Preservation, Digital Technology & Culture 50, no. 1 (2021): 3–14. http://dx.doi.org/10.1515/pdtc-2020-0028.
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Abstract This conceptual study discusses cultural and historic sounds as tangible heritage by focusing on preservation practices for both soundscape and individual sound sources besides the acoustical fingerprints of the spaces. Although the intangible cultural heritage concept has opened a new room into the sensory objects, the formal approaches to sensory heritage are still missing and ambiguous. This study dwells on why we should classify culturally significant sensory objects as tangible heritage assets in terms of heritage, sensory semiotics, and acoustics. The digitalization methods to preserve and reconstruct acoustic heritage along with their measurable and computable nature were discussed as well.
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Hubáček, Jiří, Monika Šugerková, and Lumír Gvoždík. "Underwater sound production varies within not between species in sympatric newts." PeerJ 7 (March 28, 2019): e6649. http://dx.doi.org/10.7717/peerj.6649.
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Sound production is a widespread phenomenon among animals. Effective sound use for mate or species recognition requires some acoustic differentiation at an individual or species level. Several species of caudate amphibians produce underwater sounds, but information about intra- and interspecific variation in their acoustic production is missing. We examined individual, sex, and species variation in underwater sound production in adults of two sympatric newt taxa, Ichthyosaura alpestris and Lissotriton vulgaris. Individual newts produced simple low- (peak frequency = 7–8 kHz) and mid-high frequency (14–17 kHz) clicks, which greatly overlap between sexes and species. Individual differences explained about 40–50% of total variation in sound parameters. These results provide foundations for further studies on the mechanisms and eco-evolutionary consequences of underwater acoustics in newts.
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Cressmann, Darryl. "Acoustic architecture before science. The case of Amsterdam's Concertgebouw." SoundEffects - An Interdisciplinary Journal of Sound and Sound Experience 5, no. 1 (2016): 10–23. http://dx.doi.org/10.7146/se.v5i1.23304.
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Concert halls are designed for attentively listening to music. To guarantee that the listening experience mediated by these buildings is acoustically correct, architects rely upon math- ematical formulas to measure and predict how a building will sound. Armed with these formulas, they are able to experiment with unconventional concert hall designs without compromising the acoustics. The achievements of modern architectural acoustics are a valorisa- tion of the mathematical formulas used to predict acoustics. Indeed, the development of a predictive theory of architectural acoustics by Wallace Sabine in 1900 has been celebrated as the beginning of a new era of understanding sound and acoustic design. However, overlooked in this scientific triumphalism are the aesthetic standards that shape the acoustic design of buildings for music. Sabine’s formula transformed our understanding of how music behaves in an enclosed space, but it did not change our understanding of how music should sound in these spaces. In this paper I explore these points through a history of the acoustic design of Amsterdam’s Concertgebouw, which opened in 1888. Through an examination of the history of the acoustic design of the Concertgebouw, I describe the process of acoustic design prior to Sabine as a process of aural imitation. With this concept I reconceptualise the history of acoustic architecture to better recognise, first, how Sabine’s theory is simply a more effective form of aural imitation, and second, how the quantification of sound has led to a subjective idea of good sound becoming fixed as an objective measure of what good sound should be.
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Paté, Arthur, Nicolas Côté, Charles Croënne, Jérôme Vasseur, and Anne-Christine Hladky-Hennion. "Perception of loudness changes induced by a phononic crystal in specific frequency bands." Acta Acustica 6 (2022): 42. http://dx.doi.org/10.1051/aacus/2022037.
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To study the influence of classical phononic crystal (PC) structures on the acoustical characteristics of a sound source, a combined acoustics/perceptual analysis is conducted on a PC specially designed to exhibit several spectral and wave vector properties in different audible frequency ranges. The properties, confirmed by both numerical calculations and experiments, consist in both partial and absolute band gaps, as well as a negative refraction band. A psychoacoustic feature, namely the loudness in third-octave bands, is estimated from numerical simulations of the acoustic field behind the crystal. Additional perceptual tests are conducted to evaluate the efficiency of the PC slab. In the frequency range of the band gaps, sound stimuli filtered by the PC’s impulse response are perceived as softer than stimuli resulting from a free-field propagation (FF), they also are perceived as equally (or close to equally) loud than sounds attenuated by a free-standing rigid wall (FS). In the frequency range of the focalization (negative refraction), PC sound stimuli sound louder than both FS and FF sound stimuli. The possibility of designing an efficient sound barrier based on the considered PC is finally discussed.
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Roan, Michael, Luke Neurauter, Michael Beard, and Marty Miller. "Electric vehicle warning sounds: On road and immersive audio detection results for 20 subjects." Journal of the Acoustical Society of America 152, no. 4 (2022): A121. http://dx.doi.org/10.1121/10.0015747.
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The number of electric vehicles on the road is rapidly increasing. Due to the decreased sound produced by these vehicles at low speeds there is significant concern that pedestrians and bicyclists will be at increased risk of vehicle collisions. Because of this potential for collisions, govenrnemts have institutes regulations governing additive vehicle warning sounds for electric vehicles. This research presents results on the detectability of six electric vehicle acoustic warning sounds using two different hardware systems. Detectability was initially by on-road participant tests and replicated in an immersive reality lab. Results were analyzed through both mean detection distances and probability of detection. This research aims to verify the lab environment as it will allow for a broader range of potential test scenario’s, more repeatable tests, and faster test sessions. Along with pedestrian drive by tests, experiments were conducted to evaluate stationary vehicle acoustics, 10 and 20 km/h drive by acoustics, and interior acoustic impact of each warning sound.
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da Silva Wunderlich, Priscila, Carolina Monteiro, and Juan de Frias Pierrard. "Interlaboratory and proficiency tests for buildings sound insulation field measurements in Brazil - 4th Edition 2020." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (2021): 4743–54. http://dx.doi.org/10.3397/in-2021-2824.
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Since 2013 ABNT NBR 15575:2013 entered into force in Brazil, a national technical standard that establishes acoustic requirements for dwellings, that can be verified by means of field measurements procedures performed according to specific ISO standards. Therefore, those requirements have fostered the acoustic field measurement market, and the number of laboratories has quickly increased across the county. ProAcústica - Brazilian Association for Acoustical Quality, a non-profit entity, aiming to improve the quality of the acoustics business in Brazil has organized in 2020 the fourth edition of the "Interlaboratory program of field measurements for building acoustics laboratories - INTERLAB Program". This consists of a fundamental tool for acoustic field laboratories to evaluate and verify the quality of their measurement results. This paper presents the methodologies and procedures used in the interlaboratory program, as well as the results of both the interlaboratory test and the proficiency carried out in São Paulo (Brazil) during 2017 by ProAcústica - Brazilian Association for Acoustical Quality. In this edition a total number of 25 laboratories have participated (32% more participants than the last edition in 2017) for different type of field tests: airborne sound insulation, airborne facade sound insulation, impact sound level, sound pressure level from service equipment in buildings, and reverberation time). The main objectives are the evaluation of the precision of the field test methods in the Brazilian market, and the analysis of the performance of the participating laboratories as a quality control tool.
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Guan, Shane, and Samuel L. Denes. "Acoustic impact studies and assessments by Bureau of Ocean Energy Management on offshore wind development." Journal of the Acoustical Society of America 151, no. 4 (2022): A238—A239. http://dx.doi.org/10.1121/10.0011184.
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The U.S. Bureau of Ocean Energy Management (BOEM) manages the exploration and development of offshore energy resources, including offshore wind development, on the U.S. Outer Continental Shelf. Construction, operation, and decommissioning of offshore wind facilities generate intense or long-lasting underwater sounds and vibrations that may be detrimental to marine life. This presentation will provide an overview of the activities that BOEM is in engaging in to address these impacts. BOEM’s Environmental Studies Program (ESP) has been developing funding and managing numerous studies to understand sound field characteristics and sound propagation from pile driving and geophysical surveys related to offshore wind development, as well as marine species responses to these activities. In addition, BOEM established the Center for Marine Acoustics (CMA) to strengthen its role as a driving force within the regulatory community on sound in the marine environment and provides acoustical expertise within the environmental permitting process. The CMA continues to provide guidance on the development of best practices for the use of acoustics in the evaluating the effects of offshore wind on marine fauna. This presentation will highlight the relevant acoustic studies and explain how BOEM is using the science to better manage noise impacts on the ocean environment.
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Imanov, Alisher, Aigul Kozhas, Assel Mukhamejanova, Aida Nazarova, and Dias Kazhimkanuly. "Experimental study of sound wave propagation patterns." Technobius 4, no. 2 (2024): 0057. http://dx.doi.org/10.54355/tbus/4.2.2024.0057.
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The present study compares the behavior of different sound types and their sources concerning distance. Experimental findings demonstrate a consistent reduction in noise levels with increasing distance from the sound origin, aligning with anticipated sound propagation patterns. Median noise level reductions are quantified, showing decreases from 72.7 dB at the source to 54.8 dB at a distance. Pulsed sounds exhibit pronounced fluctuations and peaks at close distances, while steady and blended sounds maintain more uniform levels. An exponential model accurately characterizes the noise reduction phenomenon (R² = 0.8664), underscoring its relevance for noise management, urban planning, and acoustic engineering applications. These results offer valuable insights into sound propagation dynamics and provide a basis for developing effective noise control strategies and optimizing environmental acoustics.
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Steffens, Henning, and Stephan D. Ewert. "Acoustically-mediated orientation and navigation in rooms." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A196. http://dx.doi.org/10.1121/10.0023245.
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While the visual system provides the dominating sensory input in sighted humans for awareness, orientation, and navigation, in low-light conditions, smoke, or in visually-impaired and blind individuals, auditory perception becomes important. Acoustic information about the environment includes sounds radiated from sources, as well as reflections and reverberation in enclosed spaces in response to either external sound sources or self-produced sounds (e.g., mouth clicks), referred to as echolocation. Here, we investigated orientation and navigation in typical corridors based on acoustic cues only, using sighted humans without training and real-time virtual acoustics. Virtual sound sources and echo-location with predefined sounds as well as own vocalizations were used with the goal to identify suitable techniques for an acoustically augmented reality (AAR) based mobility aid. A hand-held acoustic pointer, rendering virtual sound sources at the closest wall in the pointing direction was best suited for orientation and navigation. For identification of the room shape, a performance similar to that obtained with a reference (visual) laser pointer could be achieved with the acoustic pointer in specific conditions. In addition to the above acoustic pointer, an AAR-based echolocation pointer with highly directed sound radiation, as achievable in the ultrasonic range, was additionally suggested.
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Okazawa, Kazuha, Takeshi Okuzono, and Takumi Yoshida. "An auditory virtual reality of meeting room acoustics using wave-based acoustic simulations: A content for intuitive understanding of room-acoustics control effect by sound absorbers." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 2 (2023): 6328–35. http://dx.doi.org/10.3397/in_2023_0934.
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Recently, wave-based room acoustic simulation technologies are becoming a realistic option as a small-room acoustics design tool and a virtual indoor sound environment creation tool for research and education. The present paper shows an auditory VR meeting room content, which makes us easily understand how sound absorbers play an essential role in creating a better acoustic environment. Unity creates the 3D virtual reality model, and a binaural room-acoustic auralization is realized by a hybrid technique combined with Ambisonics and the head-related transfer function using RIRs computed by a high-speed parallel wave-based room acoustics solver. The VR meeting room is constructed under various acoustic treatments with sound absorber modeling by wave-based material models.
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T., Pazara. "Sound propagation modelling in a lecture hall." Scientific Bulletin of Naval Academy XXII, no. 2 (2019): 276–83. http://dx.doi.org/10.21279/1454-864x-19-i2-033.
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For lecture halls, intelligibility of speech is the most important aspect. To achieve a relative uniform distribution of sound among the listeners, a number of parameters must be taken into account. One method to speed up the design process of a lecture hall is to model the sound propagation in that room using computer acoustic software. In this paper, the authors have chosen a lecture hall from Naval Academy and made numerous simulations to discover what are the week points regarding the acoustics of this room. The acoustical parameters obtained from simulations are compared with the desired ones and a few remarks for the improvement of the room are made.
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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 (2022): 16674. http://dx.doi.org/10.3390/ijerph192416674.
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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.
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Braasch, Jonas, Andrew A. Piacsek, and Gary Scavone. "Overview of the technical area in musical acoustics." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A29. http://dx.doi.org/10.1121/10.0026676.
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Musical acoustics was launched as one of the first Technical Committees of the Acoustical Society of America. The Technical Committee in Musical Acoustics (TCMU) is concerned with applying science and technology to the field of music. The four main areas are (1) physics of musical sound production in musical instruments and the voice, (2) music perception and cognition, (3) analysis and synthesis of musical sounds and compositions, and (4) recording and reproduction technology. The scopes of areas have changed over time; for example, current interests in using groundbreaking methods in artificial intelligence and computational acoustics to solve problems. There is substantial interdisciplinary overlap with other technical committees, such as Architectural Acoustics and Physiological and Psychological Acoustics. Musical acoustic studies sometimes only require relatively moderate equipment. Thus, they lend themselves well as a research entry point for undergraduate and even high school students—especially since there is often a natural interest in music from early on. However, research in the field can also become very complex and often requires cultural understanding and listening skills to interpret technical results and direct research meaningfully. On the practical side, the TCMU sometimes organizes concerts to augment the technical sessions.
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Ferrari, Sara, Mitchell Silva, Vittorio Sala, Daniel Berckmans, and Marcella Guarino. "BIOACOUSTICS: A TOOL FOR DIAGNOSIS OF RESPIRATORY PATHOLOGIES IN PIG FARMS." Journal of Agricultural Engineering 40, no. 1 (2009): 7. http://dx.doi.org/10.4081/jae.2009.1.7.
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Cough is the element for monitoring and diagnosis of respiratory disease cause of mortality and loss of productivity in pig houses. In order to prevent as much as possible the outbreak of such diseases the aim of this research is to describe acoustic features of cough sounds originating from infections due to Actinobacillosis and Pasteurellosis and to compare them with healthy cough sounds provoked by inhalation of citric acid. The acoustic parameters investigated are peak frequency [Hz] and duration of cough signals. The differences resulting from the cough sound analysis confirmed a variability in acoustics parameters according to a state of health or disease in the animals. Sound analysis provides physic acoustic features that can be used as tool to label and detect cough in a automatic monitoring system applied in farms.
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Amran, M. Mohd, M. Shaiful Rizal, I. Maznan, et al. "Evaluation of Sound Comfort in Examination Hall Using Acoustical Environmental Analyses." Applied Mechanics and Materials 315 (April 2013): 825–29. http://dx.doi.org/10.4028/www.scientific.net/amm.315.825.
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Acoustics environmental analyses were conducted in the unoccupied examination hall at Universiti Tun Hussein Onn Malaysia (UTHM), in order to determine the acoustical environment which reflects to sound comfort during sitting exam. The acoustic parameters that measured are background noise level, sound pressure level and reverberation time. The analysis result of untreated wall condition (without absorbent material) was revealed poor while treated wall condition (with absorbent material) revealed the improvement result. Installation of absorbent material on the wall and speakers rearrangement had reduced the highest background noise level of examination hall average reverberation times. A minor alteration at examination hall had contributed to better acoustic performance.
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Zhang, Sunan, Jianyan Tian, Amit Banerjee, and Jiangli Li. "Automatic Recognition of Porcine Abnormalities Based on a Sound Detection and Recognition System." Transactions of the ASABE 62, no. 6 (2019): 1755–65. http://dx.doi.org/10.13031/trans.12975.
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Abstract. With the rapid development of large-scale breeding, manual long-term monitoring of the daily activities and health of livestock is costly and time-consuming. Therefore, the application of bio-acoustics to automatic monitoring has received increasing attention. Although bio-acoustical techniques have been applied to the recognition of animal sounds in many studies, there is a dearth of studies on the automatic recognition of abnormal sounds from farm animals. In this study, an automatic detection and recognition system based on bio-acoustics is proposed to hierarchically recognize abnormal animal states in a large-scale pig breeding environment. In this system, we extracted the mel-frequency cepstral coefficients (MFCC) and subband spectrum centroid (SSC) as composite feature parameters. At the first level, support vector data description (SVDD) is used to detect abnormal sounds in the acoustic data. At the second level, a back-propagation neural network (BPNN) is used to classify five kinds of abnormal sounds in pigs. Furthermore, improved spectral subtraction is developed to reduce the noise interference as much as possible. Experimental results show that the average detection accuracy and the average recognition accuracy of the proposed system are 94.2% and 95.4%, respectively. The effectiveness of the proposed sound detection and recognition system was also verified through tests at a pig farm. Keywords: Abnormal sounds, MFCC, SSC, States of pigs, SVDD.
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Goncharov, V. V., A. G. Ostrovskii, S. A. Sviridov, A. N. Serebryanyi, E. E. Khimchenko, and T. I. Tsyplakova. "XVII LEONID BREKHOVSKIKH SCHOOL ON OCEAN ACOUSTICS." Journal of Oceanological Research 48, no. 4 (2020): 155–59. http://dx.doi.org/10.29006/1564-2291.jor-2020.48(4).7.
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The short communication presents the results of the 17th School on Ocean Acoustics known as “L.M. Brekhovskikh School-Seminar” held online from October 19 to 23, 2020. The conference was combined with the XXXIII session of the Russian Acoustic Society. The conference was attended by 138 researchers from 25 research institutes form Russia, Abkhazia, Israel, USA, and Taiwan. Leading scientists gave 6 lectures. 59 oral and poster presentations were presented focusing on topical scientific and technical subjects: acoustic oceanology, sound propagation in the ocean, sound scattering and reflection, engineering, and signal processing, as well as bio-, geo- and atmospheric acoustics.
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Frescura, Alessia, Pyoung-Jik Lee, Jeong-Ho Jeong, and Yoshiharu Soeta. "Effect of neighbours sounds in wooden residential buildings on restorative EEG rhythm (Alpha waves)." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 7 (2023): 298–306. http://dx.doi.org/10.3397/in_2022_0047.
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The present study aimed to explore the effect of neighbours sounds commonly heard in wooden residential buildings on restorative EEG rhythm represented by Alpha waves. Thirty participants took part in a listening test which was performed to collect EEG data in distinct acoustics scenarios. Noise sensitivity and attitude toward neighbours were introduced as non-acoustic moderators and assessed through questionnaires before the experiment. A series of impact and airborne sounds were presented through loudspeakers and subwoofer, while participants sat comfortably in the simulated living room wearing the EEG headset (B-alert X24(r) system). The impact sound sources were two types of footsteps, adult walking and child running, recorded in a laboratory on different floor configurations and thus, varying in sound pressure level and frequency characteristics. The airborne sound sources were a lively conversation and a piece of classical piano music, digitally filtered to represent good and poor sound insulation performances of vertical partitions. The effect of sound stimuli and non-acoustic factors on restorative EEG rhythm corresponding to Alpha waves (8-13 Hz) was then analysed. Differences in response to distinct acoustic scenario were observed. Additionally, Alpha band activity showed to be affected by noise sensitivity and attitude toward neighbours of participants.
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Yilmazer, Semiha, Patricia Davies, and Cengiz Yilmazer. "On the development of virtual reality tools to aid in the design interior soundscapes." Journal of the Acoustical Society of America 151, no. 4 (2022): A250. http://dx.doi.org/10.1121/10.0011224.
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Can simulations of interiors spaces (visual and acoustic) be used to improve designs of spaces within buildings? The first step in the simulation of the sounds in a space is to characterize typical sound sources and their locations within the space. The next step is to characterize the paths from the sources to the user, based on geometry and materials used. Combining the contributions from all sources, is it possible to create sounds that are similar to sounds in the real environment? How close do simulated and measured sounds need to be to evoke similar emotional responses from users? The same questions arise for the visual experience and for interactions between the visual and acoustic experiences. Are there metrics that can be used to guide improvements in the virtual environment to match the real experience in the built environments? To start to answer these questions, a sound simulation program using an image source modeling approach was developed for spaces in an existing building. The impulse responses from the image source model and the measured impulse responses are compared, as are simulated and measured sounds. Room acoustics and sound quality metrics for the virtual and real sounds are also compared.
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Gee, Kent L., Micah Shepherd, Brian E. Anderson, Tracianne B. Neilsen, Matthew S. Allen, and Jonathan D. Blotter. "Graduate acoustics at Brigham Young University." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A253. http://dx.doi.org/10.1121/10.0027403.
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Graduate studies in acoustics at BYU prepare students for industry, research, and academia by complementing in-depth coursework with publishable research. Coursework provides students with a foundation in acoustical principles, practices and measurement skills, including a experimental techniques and technical writing. Labs across the curriculum cover calibration, directivity, scattering, absorption, laser Doppler vibrometry, experimental methods for dynamic structures, lumped-element mechanical systems, equivalent circuit modeling, arrays, filters, room acoustics, active noise control, and near-field acoustical holography. Recent thesis and dissertation topics include active noise control, directivity, room acoustics, energy-based acoustics, time reversal, nondestructive evaluation, vibration and acoustics of aerospace vehicles, biomedical applications, flow-based acoustics, voice production, aeroacoustics, sound propagation modeling, nonlinear propagation, high-amplitude noise analyses, machine and deep learning applied to ambient noise level prediction, crowd noise interpretation, and underwater acoustic source localization, and ocean environment classification. Graduate students are expected to present research at professional meetings and publish in peer-reviewed acoustics journals. Graduate students often serve as peer mentors to undergraduate students on related projects and may participate in field experiments to gain additional experience. @BYUAcoustics
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Wu, Xiaoqi. "Optimization of Ambient Acoustics in Los Angeles Restaurant by Material Selection." Highlights in Science, Engineering and Technology 61 (July 30, 2023): 192–99. http://dx.doi.org/10.54097/hset.v61i.10294.
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This paper explores the acoustic characteristics of Hai Di Lao Hotpot restaurant in the Los Angeles area and utilizes noise reduction technology to improve the acoustics of the restaurant in the modeling of ODEON software. First, 5 questions are designed to collect satisfaction level from eaters in the restaurant, and 12 different audio recordings are collected in the different locations of the restaurant. According to the analysis of results of questionnaire by Excel and decibel detection by Apple Watch, the improvement of acoustic environment is proven to be necessary to conduct in this restaurant. The collected audios tracks are then processed in the Audacity software to ensure that the sounds are close to sounds people heard in the restaurant as much as possible and the sound collection equipment (iPhone) won’t negatively affect the quality of audio too much. Then, an extant model in the library of ODEON software is chosen, and audios collected in the restaurant are inserted as audios for the chosen model. Some places in the model are also determined to place receivers. After that, by replacing original building materials in the model by materials that has better sound insulation or better sound concentration effect, the acoustic environment in the model is adjusted. By analysis provided by ODEON software, the audios after material adjustment are proven to be better with the change of building environment.
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Wang, Tongan. "Development of gulfstream acoustics simulator." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A276. http://dx.doi.org/10.1121/10.0018832.
Full textAbstract:
An acoustic simulator has been developed at Gulfstream Aerospace Corp. to evaluate aircraft interior acoustic environments. Many acoustic simulators developed in the past were based on headphones, but they could not be used to evaluate communication between passengers. Ambisonics and wavefield synthesis are popular methods to recreate sound fields in a 3D space, but they are either limited in the size of the recreated sound field or require great number of speakers. Therefore, a modal-based approach was used to recreate the sound field inside the Gulfstream acoustics simulator. This paper will discuss the construction of the simulator mockup, the analysis to determine the speaker placement, the test to measure the acoustic environment, and the hardware and software systems to control the simulator playback. The acoustic simulator will be used to demonstrate the acoustic environment on different aircraft in different flight conditions, evaluate the effect of improvement options, and develop advanced technologies to create finest aviation experience.