Academic literature on the topic 'Sound (acoustics)'

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Journal articles on the topic "Sound (acoustics)"

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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 (March 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 (March 1, 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 (March 1, 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 (October 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 (March 1, 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 (August 7, 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 (November 30, 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 (August 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 (February 1, 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 (November 1, 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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Dissertations / Theses on the topic "Sound (acoustics)"

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Ward, Gareth Paul. "The manipulation of sound with acoustic metamaterials." Thesis, University of Exeter, 2017. http://hdl.handle.net/10871/29774.

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The original work presented in this thesis pertains to the design and characterisation of resonant-cavity-based acoustic metamaterials, with a focus on airborne sound. There are five separate experimental chapters, each with a unique approach to the design of periodic structures that can support and manipulate air-bound acoustic surface waves via diffractive coupling between resonant-cavities. The first two chapters concern measurement of the acoustic transmission though various kinds of periodic slit-arrays, whilst the latter three chapters utilise a near-field imaging technique to directly record and characterise the dispersion of trapped acoustic surface waves. The first experimental chapter investigates the effect that thermodynamic boundary layers have on the Fabry-Perot-like cavity resonances that are so often utilised in acoustic metamaterial design. At audio frequencies, these boundary layers have a decay length that is typically more than two orders of magnitude smaller than the width of the resonating slit-cavities, hence it may naively be assumed that their effect can be ignored. However, by studying in detail the effect that reducing slit-cavity width has on the frequency of the measured cavity-resonance, for both a single slit cavity and a slit-cavity array, it is found that these boundary layer effects become significant on a far larger scale than their characteristic thickness. This is manifested in the form of a reduction in the resonant frequency as the slit-width is narrowed. Significant attenuation of the resonance and a 5% reduction in the effective speed of sound through the cavity is measured when the boundary layers form only 5% of the total width of each slit. Hence, it is both shown that the prevalent loss free treatment of acoustic slit-cavities is unrealistic, and that one may control the effective speed of sound through the slit-cavities with a simple change in slit-width. The second chapter explores the effect of ‘compound’ grating structure on trapped acoustic surface waves, a compound grating having a basis comprised of more than one resonating element. The angle dependent acoustic transmission spectra of four types of aluminium slit-array are recorded, and for the compound gratings, it is found that sharp dips appear in the spectra that result from the excitation of a ‘phase-resonance’. This occurs as new degrees-of-freedom available to the acoustic near-field allow the fields of adjacent cavities within a unit-cell to be both out-of-phase and strongly enhanced. By mapping the transmission spectra as a function of in-plane wavevector, the dispersions of the modes supported by each sample are determined. Hence, the origin of the phase-resonant features may be described as acoustic surface waves that have been band-folded back into the radiative regime via diffraction from higher in-plane wavevectors than possible on a simple grating. One of the samples is then optimised via numerical methods that account for thermodynamic boundary layer attenuation, resulting in the excitation of a sharp, deep transmission minimum in a broad maximum that may be useful in the design of an acoustic filter. The third chapter introduces the near-field imaging technique that can be utilised to directly characterise acoustic surface waves, via spatial fast Fourier transform algorithms of high-resolution pressure field maps. The acoustic response of a square-lattice open-ended hole array is thus characterised. It is found that over a narrow frequency band, the lattice symmetry causes the acoustic surface power flow to be channelled into specific, predictable directions, forming ‘beams’ with a well defined width. In chapter four, the existence of the ‘acoustic line mode’ is demonstrated, a type of acoustic surface wave that may be supported by a simple line of open-ended hole cavities. The near-field imagine technique is again used to extract the mode dispersion. This acoustic line mode may be readily manipulated, demonstrated by arrangement of the line of holes into the shape of a ring. The existence of this type of mode offers a great deal of potential for the control of acoustic energy. Chapter five explores the effect of ‘glide-symmetry’ on a pair of acoustic line modes arranged side-by-side. A control sample not possessing glide- symmetry is first characterised, where measurement of the acoustic near- fields show that this sample supports two separate modes at different frequencies, with their phase either symmetric or anti-symmetric about the mirror plane between the lines of holes. One of these lines is then shifted along its periodicity by half of a grating pitch, thus creating glide-symmetry. The resulting sample is found to support a single hybrid mode, capable of reaching a much larger in-plane wavevector than possible on a simple grating with no gaps in its band-structure, and displaying a region of negative dispersion. The third sample demonstrates how one may increase the coupling strength between the two lines of holes via manipulation of the cavity shape, thus enhancing the glide-symmetry effect. The thesis concludes with preliminary investigations into other possible ways of manipulating acoustic surface waves, such as with the use of ‘screw-symmetry’.
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Durham, Robert Carson. "The architecture of sound." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/23910.

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Price, M. A. "Sound propagation in woodland." Thesis, Open University, 1986. http://oro.open.ac.uk/56924/.

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A review of past research into sound propagation in woodland is presented. The attenuation of sound in woodland is small between about 800 and 2000Hz and greater at low and high frequencies. Attenuation measurements made in three contrasting woodlands are presented and compared with theoretical models. Propagation models using simple one- and two-parameter impedance models are used to calculate appropriate ground parameters for the prediction of impedance of the woodland soils. The ground parameters varied on different days in a single stand due to differences in moisture content and compaction. The overall differences between the stands are not significant. The woodland soil has a considerably lower impedance than other outdoor ground surfaces such as grassland or sand. A theoretical model for the attenuation of sound by thermoviscous absorption and scattering within an array of cylinders is assessed by means of a model experiment with wooden rods in an anechoic chamber. An input density 60% lower than the actual density gives a good agreement with measured attenuation. This modified model also predicts the attenuation by the cylinders in the presence of a ground surface. The scattering model is compared with the high frequency attenuation measured in the , woodland, using sampled trunk densities and radius, this underpredicts the observed attenuation, particularly in the stands with a dense branch and foliage structure. Addition of a second. dense, array of non rigid scatterers gives a good agreement with the measured data, thus modelling the scattering and absorbing effects of trunks, branches and leaves, in the high frequencies. Finally, a combined model is presented in which the attenuation caused by ground interference effects. at low frequencies. is added to a prediction of attenuation by the scattering model. across the whole frequency range. This model reproduces the frequency dependence of the attenuation of sound in woodland.
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Kang, Jian. "Acoustics of long enclosures." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266240.

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Bolin, Karl. "Masking of wind turbine sound by ambient noise." Licentiate thesis, Stockholm : Marcus Wallenberg laboratory for sound and vibration research, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4227.

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Servis, Dimitris C. "Sound transmission at pipe joints." Thesis, Heriot-Watt University, 1991. http://hdl.handle.net/10399/782.

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Williams, Julian Scott. "Nonlinear problems in vortex sound." Thesis, University of Leeds, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305854.

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Hopkins, Carl. "Structure-borne sound transmission between coupled plates." Thesis, Heriot-Watt University, 2000. http://hdl.handle.net/10399/1166.

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Miller, Nolan W. "Athenian Acoustics: A Sonic Exploration." Ohio University Honors Tutorial College / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1556289254557967.

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楊兆麟 and Siu-lun Patrick Yeung. "Effect of bubbly liquid on underwater sound transmission." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31237964.

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Books on the topic "Sound (acoustics)"

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Ingard, K. Uno. Acoustics. Hingham, Mass: Infinity Science Press, 2008.

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Beyer, Robert T. Nonlinear acoustics. Woodbury, NY: Acoustical Society of America, 1997.

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Beranek, Leo Leroy. Acoustics. New York, N.Y: Published by the Acoustical Society of America through the American Institute of Physics, 1993.

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America, Acoustical Society of, ed. Acoustics. New York, N.Y: Published by the American Institute of Physics for the Acoustical Society of America, 1986.

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Czechoslovakia) International Acoustical Conference (31st 1997 Vysoké Tatry. Acoustics--High Tatras '97: European Acoustics Association (EAA) symposium : proceedings of the 31st International Acoustical Conference. Edited by European Acoustics Association. Zvolen: Technická univerzita, 1997.

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E, Hall Donald. Basic acoustics. New York: Harper & Row, 1987.

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E, Hall Donald. Basic acoustics. New York: John Wiley, 1987.

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E, Hall Donald. Basic acoustics. Malabar, Fla: Krieger, 1993.

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Standardization, International Organization for, ed. Acoustics. 2nd ed. Genéve, Switzerland: International Organization for Standards, 1995.

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Rossing, Thomas D. Principles of Vibration and Sound. New York, NY: Springer New York, 2004.

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Book chapters on the topic "Sound (acoustics)"

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Kuttruff, Heinrich. "Sound absorption and sound absorbers." In Room Acoustics, 125–56. Sixth edition. | Boca Raton : CRC Press, [2017]: CRC Press, 2016. http://dx.doi.org/10.1201/9781315372150-6.

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Kuttruff, Heinrich, and Michael Vorländer. "Sound absorption and sound absorbers." In Room Acoustics, 133–64. 7th ed. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003389873-6.

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Möser, Michael. "Sound Absorbers." In Engineering Acoustics, 119–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05391-1_6.

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Möser, Michael. "Sound absorbers." In Engineering Acoustics, 171–215. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-92723-5_6.

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MacLennan, David N., and E. John Simmonds. "Underwater sound." In Fisheries Acoustics, 7–44. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-017-1558-4_2.

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Manik, Dhanesh N. "Airborne Sound." In Vibro-Acoustics, 121–77. Boca Raton : CRC Press, 2017.: CRC Press, 2017. http://dx.doi.org/10.1201/9781315156729-3.

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Manik, Dhanesh N. "Sound Sources." In Vibro-Acoustics, 305–30. Boca Raton : CRC Press, 2017.: CRC Press, 2017. http://dx.doi.org/10.1201/9781315156729-7.

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Sinambari, Gh Reza. "Sound Generation." In Design Acoustics, 57–111. Wiesbaden: Springer Fachmedien Wiesbaden, 2023. http://dx.doi.org/10.1007/978-3-658-40183-2_3.

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Pierce, Allan D. "Quantitative Measures of Sound." In Acoustics, 61–113. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11214-1_2.

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Möser, Michael. "Perception of Sound." In Engineering Acoustics, 1–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05391-1_1.

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Conference papers on the topic "Sound (acoustics)"

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Wittstock, Volker. "Sound Power and Sound Insulation at Low Frequencies." In 2018 Joint Conference - Acoustics. IEEE, 2018. http://dx.doi.org/10.1109/acoustics.2018.8502395.

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ROSE, KA. "WAREHOUSE STUDIO ACOUSTICS." In Reproduced Sound 1989. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/21658.

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ELLISON, S., and M. POLETTI. "CONTROL OF ROOM ACOUSTIC PARAMETERS BY THE VARIABLE ROOM ACOUSTICS SYSTEM (VRAS)." In Reproduced Sound 2004. Institute of Acoustics, 2023. http://dx.doi.org/10.25144/18059.

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KANG, J. "FROM SOUND PROPAGATION TO SOUND PERCEPTION." In ACOUSTICS 2023. Institute of Acoustics, 2023. http://dx.doi.org/10.25144/16592.

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WATKINSON, J. "DIGITAL RECORDING TECHNIQUES IN ACOUSTICS." In Reproduced Sound 1994. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/20266.

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DRUYVESTEYN, WF, RM AARTS, AJ ASBURY, P. GELAT, and A. RUXTON. "PERSONAL SOUND." In Acoustics 94. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/20246.

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BARRON, M. "AUDITORIUM ACOUSTICS - A ROOM ACOUSTICIAN'S PERSPECTIVE." In Reproduced Sound 2007. Institute of Acoustics, 2023. http://dx.doi.org/10.25144/17744.

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CROSS, R. "BT'S ACOUSTICS LABORATORY: PAST AND PRESENT." In Reproduced Sound 1995. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/20141.

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BURD, A., and L. HASLAM. "MICROPROCESSOR CONTROLLED VARIABLE ACOUSTICS IN HOBART." In Reproduced Sound 1988. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/21866.

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FINCHAM, LR, A. JONES, R. R WILSON, and RH SMALL. "FREE FIELD SIMULATION OF LOUDSPEAKER/ROOM ACOUSTICS." In Reproduced Sound 1990. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/21411.

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Reports on the topic "Sound (acoustics)"

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Spiesberger, John. Coherence of Sound using Navy Sonars: Deep Water Acoustics. Fort Belvoir, VA: Defense Technical Information Center, September 2010. http://dx.doi.org/10.21236/ada542058.

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Spiesberger, John L. Coherence of Sound Using Navy Sonars: Deep Water Acoustics. Fort Belvoir, VA: Defense Technical Information Center, May 2012. http://dx.doi.org/10.21236/ada561586.

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Spiesberger, John. Coherence of Sound using Navy Sonars: Deep Water Acoustics. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada575109.

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Chotiros, Nicholas P. Sediment Acoustics: LF Sound Speed, HF Scattering and Bubble Effects. Fort Belvoir, VA: Defense Technical Information Center, September 2006. http://dx.doi.org/10.21236/ada612090.

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Chotiros, Nicholas P. Sediment Acoustics: LF Sound Speed, HF Scattering and Bubble Effects. Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada543370.

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Hamilton, Mark F. Problems in Nonlinear Acoustics: Rayleigh Waves, Pulsed Sound Beams, and Waveguides. Fort Belvoir, VA: Defense Technical Information Center, August 1993. http://dx.doi.org/10.21236/ada274587.

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Yen, Kang K., and Jianguo Yan. Using Smoothed Sound Speed To Reduce Chaoticity of Chaos in Ocean Acoustics. Fort Belvoir, VA: Defense Technical Information Center, April 1998. http://dx.doi.org/10.21236/ada351019.

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Alberts, II, Coleman W.C., Noble Mark A., and John M. Fundamental Cases of Urban Acoustics and Their Interaction with Propagating Sound: Phase II. Fort Belvoir, VA: Defense Technical Information Center, September 2010. http://dx.doi.org/10.21236/ada528765.

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Scales, John A., Martin Smith, and Brian Zadler. Generation of Intense Low-Frequency Collimated Sound Beams by Nonlinear Acoustics and Detection by a Millimeter-Wave Vibrometer. Fort Belvoir, VA: Defense Technical Information Center, October 2010. http://dx.doi.org/10.21236/ada533326.

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Carpenter, Grace. Shenandoah National Park: Acoustic monitoring report, 2016?2017. National Park Service, 2023. http://dx.doi.org/10.36967/2300465.

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Abstract:
This report presents acoustical data gathered by the Natural Sounds and Night Skies Division (NSNSD) at Shenandoah National Park (SHEN) in August?September of 2016 and January?March of 2017. Data were collected at four sites (Figure 1) to provide park managers with information about the acoustical environment, sources of noise , and the existing ambient sound levels within the park. In these deployments, sound pressure level (SPL) was measured continuously every second by a calibrated sound level meter. Other equipment included an anemometer to collect wind speed and a digital audio recorder collecting continuous recordings to document sound sources. In this document, ?sound pressure level? refers to broadband (12.5 Hz?20 kHz), A-weighted, 1-second time averaged sound level (LAeq, 1s), and hereafter referred to as ?sound level.? Sound levels are measured on a logarithmic scale relative to the reference sound pressure for atmospheric sources, 20 ?Pa. The logarithmic scale is a useful way to express the wide range of sound pressures perceived by the human ear. Sound levels are reported in decibels (dB). A-weighting is applied to sound levels to account for the response of the human ear (Harris, 1998). To approximate human hearing sensitivity, A-weighting discounts sounds below 1 kHz and above 6 kHz.
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