Journal articles on the topic 'Acoustics'
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1
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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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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Ellison, Steve, Pierre Germain, and Roger Schwenke. "Making a room ready and ensuring success for active acoustics systems." Journal of the Acoustical Society of America 154, no. 4_supplement (October 1, 2023): A169. http://dx.doi.org/10.1121/10.0023160.
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Active Acoustics systems can be thought of as reducing the effective absorption of a room and/or increasing its effective volume and depend upon well-designed acoustic treatment and room shaping. Because Active Acoustics systems cannot reduce HVAC noise or improve isolation, these associated acoustical properties depend on the room’s acoustical design. Therefore, a successful Active Acoustic system installation relies on coordination with the acoustical consultant, from conceptual design to scheduling initial rehearsals with the various performance groups that utilize the room. Installation examples from around the world, including Australasia, are provided to illustrate lessons learned for developing successful projects.
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Beyer, Robert T. "Acoustic, acoustics." Journal of the Acoustical Society of America 98, no. 1 (July 1995): 33–34. http://dx.doi.org/10.1121/1.413688.
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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 (March 1, 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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Grazioli, Gianluca, and Andrea Gozzi. "Simulation of acoustical parameters of churches in a virtual acoustics laboratory." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A176. http://dx.doi.org/10.1121/10.0027224.
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Current ISO standards for acoustical assessment limit the use of traditional mono-dimensional microphones for measuring equipment. However, microphone arrays offer more accurate spatial information compared to traditional microphones. This presents an opportunity to enhance research on architectural acoustics and preserve the acoustics of cultural heritage more effectively. Furthermore, modern recording studios equipped with virtual acoustics systems allow for the integration of spatial room impulse responses. This enables real-time auralization in controlled environments and enhances the overall immersive audio experience for users and musicians. This paper analyzes the main acoustical parameters obtained from spatial impulse responses captured in churches using various ambisonic microphones and inserted into a controlled, interactive, and immersive virtual acoustics system. The captured spatial acoustic measurements are then reproduced and evaluated in a virtual acoustics laboratory to identify any discrepancies between real and virtual spaces.
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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 (April 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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Neidhardt, Annika, Christian Schneiderwind, and Florian Klein. "Perceptual Matching of Room Acoustics for Auditory Augmented Reality in Small Rooms - Literature Review and Theoretical Framework." Trends in Hearing 26 (January 2022): 233121652210929. http://dx.doi.org/10.1177/23312165221092919.
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For the realization of auditory augmented reality (AAR), it is important that the room acoustical properties of the virtual elements are perceived in agreement with the acoustics of the actual environment. This perceptual matching of room acoustics is the subject reviewed in this paper. Realizations of AAR that fulfill the listeners’ expectations were achieved based on pre-characterization of the room acoustics, for example, by measuring acoustic impulse responses or creating detailed room models for acoustic simulations. For future applications, the goal is to realize an online adaptation in (close to) real-time. Perfect physical matching is hard to achieve with these practical constraints. For this reason, an understanding of the essential psychoacoustic cues is of interest and will help to explore options for simplifications. This paper reviews a broad selection of previous studies and derives a theoretical framework to examine possibilities for psychoacoustical optimization of room acoustical matching.
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Allen, Matthew S., Brian E. Anderson, Jonathan D. Blotter, Kent L. Gee, Tracianne B. Neilsen, Micah Shepherd, and Scott D. Sommerfeldt. "Graduate acoustics at Brigham Young University." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A122. http://dx.doi.org/10.1121/10.0015753.
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Graduate studies in acoustics at Brigham Young University prepare students for industry, research, and academia by complementing in-depth coursework with publishable research. Coursework provides a solid foundation in core acoustical principles and practices and measurement skills, including a strong foundation in 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. Additionally, 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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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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Woszczyk, Wieslaw. "Active Acoustics in Concert Halls - A New Approach." Archives of Acoustics 36, no. 2 (May 1, 2011): 379–93. http://dx.doi.org/10.2478/v10168-011-0028-6.
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Abstract Active acoustics offers potential benefits in music halls having acoustical short-comings and is a relatively inexpensive alternative to physical modifications of the enclosures. One critical benefit of active architecture is the controlled variability of acoustics. Although many improvements have been made over the last 60 years in the quality and usability of active acoustics, some problems still persist and the acceptance of this technology is advancing cautiously. McGill's Virtual Acoustic Technology (VAT) offers new solutions in the key areas of performance by focusing on the electroacoustic coupling between the existing room acoustics and the simulation acoustics. All control parameters of the active acoustics are implemented in the Space Builder engine by employing multichannel parallel mixing, routing, and processing. The virtual acoustic response is created using low-latency convolution and a three-way temporal segmentation of the measured impulse responses. This method facilitates a sooner release of the virtual room response and its radiation into the surrounding space. Field tests are currently underway at McGill University involving performing musicians and the audience in order to fully assess and quantify the benefits of this new approach in active acoustics.
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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 (January 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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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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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 (October 1, 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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Brown, David A., Paul J. Gendron, and John R. Buck. "Graduate education in acoustic engineering, transduction, and signal processing University of Massachusetts Dartmouth." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A123. http://dx.doi.org/10.1121/10.0015756.
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The University of Massachusetts Dartmouth has an established graduate program of study with a concentration in Applied Acoustics leading to the M.S. and Ph.D. degree in Electrical Engineering. The program offers courses and research opportunities in the area of electroacoustic transduction, underwater acoustics, and signal processing. Courses include the Fundamentals of Acoustics, Random Signals, Underwater Acoustics, Introduction to Transducers, Electroacoustic Transduction, Medical Ultrasonics, Digital Signal Processing, Detection Theory, and Estimation Theory. The ECE department established the university’s indoor underwater acoustic test and calibration facility which is one of the largest academic facilities supporting undergraduate and graduate thesis and sponsored research. The department has collaborations with many marine acoustic related companies including nearby Naval Undersea Warfare Center in Newport, RI and Woods Hole Oceanographic Institute in Cape Cod, MA. The presentation will highlight recent theses and dissertations, course offerings, and industry and government collaborations that support acoustical engineering, transduction, and signal processing.
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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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Postma, Barteld N. J., and Brian F. G. Katz. "An archaeoacoustic study on shape: the case study of the Iffland Theatre’s history (1802–1817)." Acta Acustica 7 (2023): 54. http://dx.doi.org/10.1051/aacus/2023046.
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Previous studies have discussed six pre-Sabine quantifiable guidelines employed in room acoustic design: voice directivity, audience rake, “echo theory”, stage acoustics, reverberation, and length, width, and height ratios. Around the turn of the 18th century, these notions led to two shapes that were theoretically regarded optimal for rooms with acoustical demands: ellipse and semi-circle. The first of these shapes to be tested was the ellipse in the design for the Iffland Theatre (1802–1817). As the resulting acoustics were notoriously poor, contemporary architects and acousticians discussed the grounds for the failed acoustics as well as possible corrections. Multiple subsequent halls were also based on lessons learned from this acoustic failure. As part of this archaeoacoustics research, geometric acoustic numerical simulations were employed to estimate the actual and renovated room acoustic conditions. Three configurations of the hall have been reconstructed. Results show that the hall’s shape led to sound focusing and that the rounded proscenium arch likely induced echoes. Proposed solutions of the time to increase the scattering or absorption appear unlikely to have solved the observed acoustic problems.
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Jalil, Nurul Amira Abd, Nazli Bin Che Din, and Nila Inangda Manyam Keumala Daud. "A Literature Analysis on Acoustical Environment in Green Building Design Strategies." Applied Mechanics and Materials 471 (December 2013): 138–42. http://dx.doi.org/10.4028/www.scientific.net/amm.471.138.
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Acoustic quality is important in ensuring a healthy and workable working environment. One of green buildings main objective is to reduce the building impact on human health and performance. This was emphasized in most green building rating system under its requirement for Indoor Environmental Quality (IEQ). IEQ highlights the four main points for achieving an improved indoor environment: indoor air quality, acoustics, visual comfort (lighting) and thermal comfort. Although acoustics was mentioned in the IEQ criteria, according to previous surveys and studies; acoustics quality in green buildings were not improving. It seems as though in order to improve on other green building criteria, acoustics performance is bound to become poorer. Through review of previous literature, survey and studies on acoustical performance in green buildings, the objective of this paper is to identify how green building design strategies contribute to the degradation of acoustical environment in green office buildings. Findings shows that design strategies implemented to cater for other green building requirements such as natural ventilation, daylight, reduction of finishes and office layout have unintentionally decrease the acoustical quality.
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Berardi, Umberto. "A Double Synthetic Index to Evaluate the Acoustics of Churches." Archives of Acoustics 37, no. 4 (December 1, 2012): 521–28. http://dx.doi.org/10.2478/v10168-012-0050-3.
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Abstract Several authors have proposed indices to synthesize the acoustics of a space, especially of concert halls. Meanwhile, a few studies have focused on the acoustics of worship spaces. The peculiarities of these last ones have shown distinctive characteristics. The increasing interest for the acoustics of worship spaces justifies the formulation of indices to synthesize the results of acoustic studies in these buildings too. This paper proposes a double synthetic index to evaluate the acoustics of a church. The index is obtained combining the average values of seven parameters generally considered in studies of architectural acoustics. The differences between requirements for music and speech in churches suggest to consider different optimal values of the selected parameters for different kinds of sound. A double synthetic index has been defined to synthesize the acoustical properties related to the music and to the speech separately. The validity of this double index is then assessed, comparing its values with subjective preferences captured through listening tests. The index, which is proposed and validated in this paper, aims to be an instrument to show synthetically the acoustical characteristics of a church to people with low knowledge in acoustics.
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Choi, Minsik, and Max Kapur. "Human-centered design in acoustics education for undergraduate music majors." Journal of the Acoustical Society of America 151, no. 4 (April 2022): 2282–89. http://dx.doi.org/10.1121/10.0010043.
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An acoustics course for undergraduate music majors should take advantage of the natural affinity between acoustic science and musical practice. In this study, current students and recent graduates of one university's music school were surveyed with the goal of assessing their unique needs in an acoustics curriculum. The results of the survey are reported, and several curriculum recommendations are provided based on the principles of human-centered design. In particular, the acoustics course can harness musicians' intuitive understanding of sound by incorporating musical instruments into classroom demonstrations. Also, acoustics instructors should strive to introduce students to acoustical software, which is also used in the music industry. Finally, the survey findings suggest that the contemporary shift toward active learning and technology-based instruction in acoustics pedagogy is beneficial to music students.
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Akhtar, Syed A., Manish Manohare, and Vishakha Kawathekar. "Acoustical characterization of historical performance structure of Taramati Baradari at Hyderabad, India." Journal of the Acoustical Society of America 154, no. 4_supplement (October 1, 2023): A212—A213. http://dx.doi.org/10.1121/10.0023316.
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The Baradari, a square-shaped building with twelve open doors, was designed for entertainment purposes and featured outstanding acoustic qualities, making it ideal for music and dance performances by noble courtesans. This article focuses on the acoustic characterization of Taramati Baradari, a historical performance structure in Hyderabad, India, built during the 17th century by the Qutb Shahi (Golconda) dynasty. The research aimed to assess the space's acoustical behaviour through in-situ measurements in an unoccupied state. Virtual acoustical models were developed and validated using the in situ measurements in the same condition, later simulated and analysed for both occupied and unoccupied scenarios, revealing an average reverberation time (RT60) of 4.1 s at mid-frequencies for unoccupied conditions. After analysing various acoustical parameters, it became evident that Taramati Baradari's acoustics possessed a distinctive character, giving the structure a unique identity. Unfortunately, in the Indian context, conservation and restoration efforts have primarily focused on visual aspects, often neglecting considerations of the space's acoustics. Therefore, characterizing the acoustic nature of performance structures becomes vital to inform sustainable interventions for conservation architects.
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Duran, Sebastian, Martyn Chambers, and Ioannis Kanellopoulos. "An Archaeoacoustics Analysis of Cistercian Architecture: The Case of the Beaulieu Abbey." Acoustics 3, no. 2 (March 26, 2021): 252–69. http://dx.doi.org/10.3390/acoustics3020018.
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The Cistercian order is of acoustic interest because previous research has hypothesized that Cistercian architectural structures were designed for longer reverberation times in order to reinforce Gregorian chants. The presented study focused on an archaeoacacoustics analysis of the Cistercian Beaulieu Abbey (Hampshire, England, UK), using Geometrical Acoustics (GA) to recreate and investigate the acoustical properties of the original structure. To construct an acoustic model of the Abbey, the building’s dimensions and layout were retrieved from published archaeology research and comparison with equivalent structures. Absorption and scattering coefficients were assigned to emulate the original room surface materials’ acoustics properties. CATT-Acoustics was then used to perform the acoustics analysis of the simplified building structure. Shorter reverberation time (RTs) was generally observed at higher frequencies for all the simulated scenarios. Low speech intelligibility index (STI) and speech clarity (C50) values were observed across Abbey’s nave section. Despite limitations given by the impossibility to calibrate the model according to in situ measurements conducted in the original structure, the simulated acoustics performance suggested how the Abbey could have been designed to promote sacral music and chants, rather than preserve high speech intelligibility.
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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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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 (October 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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Broyles, Jonathan. "Acoustic design trade-offs when reducing the carbon footprint of buildings." Journal of the Acoustical Society of America 153, no. 3_supplement (March 1, 2023): A348. http://dx.doi.org/10.1121/10.0019111.
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Architects and building engineers are increasingly tasked to consider the environmental performance of building designs to meet national and global targets to reduce carbon emissions. While minimizing the carbon footprint is needed to mitigate the effects of climate change, sustainability-driven design can have benefits or unintended consequences on secondary design objectives. Neglect of additional building disciplines could negatively impact the indoor environmental quality in a building and require costly change orders or retrofits. Recent research has shown that sustainability-driven design decisions can affect the acoustical performance in a building, though sustainable and acoustical goals are often unrelated. In response, this presentation reviews acoustic trade-offs when the building design is driven by sustainable goals. Acoustical ramifications and design solutions when minimizing the operational and embodied carbon are discussed. Lastly, areas of future research at the intersection of architectural acoustics and sustainability are provided. Overall, this presentation gives a brief overview on reducing carbon emissions in buildings, discusses the consequences sustainability-driven design can have on building acoustics, and provides sustainable alternatives that do not hinder acoustic performance.
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Baydur, Caner, Xu Wang, and Dongxing Mao. "The acoustics program at the Institute of Acoustics, Tongji University, China." Journal of the Acoustical Society of America 152, no. 2 (August 2022): 1058–67. http://dx.doi.org/10.1121/10.0013735.
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The acoustics research at Tongji University began in the mid-1950s. The Institute of Acoustics (IOA) of Tongji University, which is one of the earliest institutions engaged in acoustics research in China, was formally established in 1984. The IOA has decades of experience in acoustics education, including offering a master's degree program for approximately 40 years, a Ph.D. program for 35 years, and a postgraduate program for 25 years. The IOA is one of the oldest acoustic research facilities in China with outstanding acoustics laboratories. Research at the IOA is performed in many areas of acoustics, which focus on detection acoustics and marine acoustics, laser ultrasonics and photoacoustics, medical ultrasonics and bioacoustics, architectural acoustics, environmental acoustics, noise control, functional and microstructural acoustic materials, aeroacoustics and aeronautical acoustics, and vehicle acoustics. This paper presents acoustics education at the undergraduate and graduate levels of Tongji University and its outstanding acoustics research facilities in detail.
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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 (October 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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Vorländer, Michael. "Virtual Acoustics." Archives of Acoustics 39, no. 3 (March 1, 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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Barclay, David R. "Introduction to the Acoustical Oceanography Technical Committee." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A29. http://dx.doi.org/10.1121/10.0026673.
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The Acoustical Oceanography Technical Committee is responsible for representing and fostering Acoustical Oceanography within the Acoustical Society of America. It is concerned with the development and use of acoustical techniques to measure and understand the physical, biological, geological, and chemical parameters and processes of the sea. Several acoustical methods are used to quantitatively study various oceanographic processes. Approaches include ocean parameter estimation by acoustical methods, remote sensing by passive and active acoustics, acoustic imaging, inversion, and tomography, and developing acoustical instrumentation for oceanographic studies.
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Diharjo, Kuncoro, Ubaidillah, Wijang Wisnu Raharjo, Joko Pitoyo, and Mustaqim. "Underwater Acoustics Evaluation of Glass Fiber – Polyurethane Sandwich Composite." Applied Mechanics and Materials 660 (October 2014): 516–20. http://dx.doi.org/10.4028/www.scientific.net/amm.660.516.
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This article presents underwater acoustics evaluation of glass fiber – polyurethane sandwich composite which is useful for ship materials. The composite consists of two main functional laminations namely structural and acoustical lamination. The structural lamination is constructed from polyester and polyethylene fibers while the polyurethane is potential for acoustical lamination. The fabrication involves vacuum bagging and conventional hydraulic methods. The materials will be treated in both with and without immersion in sea water. The immersion process takes time about 72 hours. The properties of acoustics for each materials generally have high insertion loss (maximum found 25 dB), but some of them can reach low insertion loss (below 5 dB). The optimization of combination between structural and acoustic materials is promising to be investigated in near future to achieve the optimum properties of materials in terms of sound transparency.
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Dessi-Olive, Jonathan, and Timothy Hsu. "A design framework for absorption and diffusion panels with sustainable materials." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 4 (August 1, 2021): 2207–18. http://dx.doi.org/10.3397/in-2021-2074.
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Architectural acoustics has not traditionally had unified design methods that specify acoustical performance, visual appearance, and sustainable material selection, leading to underperforming products that contribute to a waste stream of petro-chemical foam and fiberglass materials. The evolution of design, materials, and manufacturing techniques in recent years has created new opportunities to reimagine acoustic diffusers and absorbers. Previous work by the authors have demonstrated a unifying framework for design and collaboration in architectural acoustics. The framework uses visually-driven computational design method inspired by shape grammars that generate a wide range of acoustic phase grating diffuser arrays that display unique visual and performative qualities. Simulation and evaluation metrics to assess the complexity of each design are rated in terms of their diffusion and absorption coefficients and a visual aesthetic coefficient. This paper extends the framework to include digital fabrication protocols and sustainable material specifications - including the use of fungi-based materials. Built prototypes demonstrate an expanded acoustic design space that gives acousticians the potential to create custom diffuser shapes with precise acoustical response. The innovative combination of computational design methods and sustainable fabrication protocols will be discussed, and the acoustic properties of arrays will be evaluated and compared to simulations of corresponding designs.
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Van Uffelen, Lora, James H. Miller, and Gopu R. Potty. "Underwater acoustics and ocean engineering at the University of Rhode Island." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A124. http://dx.doi.org/10.1121/10.0015761.
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Underwater acoustics is one of the primary areas of emphasis in the Ocean Engineering Department at the University of Rhode Island, the first Ocean Engineering program in the United States. The program offers Bachelors, Masters (thesis and non-thesis options) and PhD degrees in Ocean Engineering. These programs are based at the Narragansett Bay campus, providing access to a living laboratory for student learning. Some key facilities of the program are an acoustics tank and a 100-foot-long wave tank. At the graduate level, students are actively involved in research focused in areas such as acoustical oceanography, propagation modeling, geoacoustic inversion, marine mammal acoustics, ocean acoustic instrumentation, and transducers. An overview of classroom learning and ongoing research will be provided, along with information regarding the requirements of entry into the program.
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Markham, Benjamin E. "An expanding pipeline: 20 + years of Acentech internships." Journal of the Acoustical Society of America 154, no. 4_supplement (October 1, 2023): A18. http://dx.doi.org/10.1121/10.0022643.
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Acoustics interns at Acentech, a multidisciplinary acoustics, technology, and noise & vibration control consultancy based in Cambridge, Massachusetts, USA, have included undergraduate and graduate students as well as graduates in many fields of engineering, physics, and architecture. Acentech interns work on a deliberate mix of both project work and internal research and development, often inspired by research presented by academics in our field. For a time, interns were typically from one of approximately a dozen US-based graduate programs in acoustic, and more rarely, from one or two undergraduate programs with acoustics concentrations. In recent years, successful interns have hailed from an increasingly wide array of university programs, and the results have exceeded expectations: an increasingly diverse pipeline of skilled, intellectually curious individuals with a passion for music, buildings, and acoustical design.
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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 (March 1, 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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Le-Muet, Yoan, Patrick Chevret, Thomas Bonzom, and Laurent Brocolini. "Outlook for the ISO 22955: Acoustic quality of open plan offices." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 5 (February 1, 2023): 2633–42. http://dx.doi.org/10.3397/in_2022_0369.
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The ISO 22955 standard " Acoustic quality of open plan offices " was published in may 2021. It aims to provide principles, descriptors, and measurement methods to characterize acoustics, which are easy to use and correspond to the perception of the acoustical environment by the occupants of the spaces. The scope of the standard is the acoustics of open-plan offices and, more specifically, cognitive effects of noise, i.e. acoustic comfort and noise disturbance in association with the activity. After more than a year of use of the standard, this document proposes to take stock of it and to identify potential paths of reflection for a possible future revision. Among the points of discussion considered, are the consequences of the evolution of office work, activities and concepts in the tertiary sector (flex office, co-working, teleworking, etc.), and their implication on acoustic quality. Another fundamental matter is the relevance of the indicators used in the standard and the associated required values.
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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 (October 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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Autio, Hanna, Mathias Barbagallo, Carolina Ask, Delphine Bard Hagberg, Eva Lindqvist Sandgren, and Karin Strinnholm Lagergren. "Historically Based Room Acoustic Analysis and Auralization of a Church in the 1470s." Applied Sciences 11, no. 4 (February 10, 2021): 1586. http://dx.doi.org/10.3390/app11041586.
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Worship space acoustics have been established as an important part of a nation’s cultural heritage and area of acoustic research, but more research is needed regarding the region of northern Europe. This paper describes the historical acoustics of an important abbey church in Sweden in the 1470s. A digital historical reconstruction is developed. Liturgical material specific to this location is recorded and auralized within the digital reconstruction, and a room acoustic analysis is performed. The analysis is guided by liturgical practices in the church and the monastic order connected to it. It is found that the historical sound field in the church is characterized by the existence of two distinct acoustical subspaces within it, each corresponding to a location dedicated to the daily services of the monastical congregations. The subspaces show significantly better acoustic conditions for liturgical activities compared to the nave, which is very reverberant under the conditions of daily services. Acoustic transmission from the two subspaces is limited, indicating that the monastic congregations were visually and acoustically separated from the visitors in the nave and each other.
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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 (March 1, 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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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 (March 1, 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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Ellison, Steve, and Roger Schwenke. "Integrating spatial audio and active acoustics systems." Journal of the Acoustical Society of America 154, no. 4_supplement (October 1, 2023): A169. http://dx.doi.org/10.1121/10.0023161.
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Rooms incorporating Spatial Audio and Active Acoustic systems are being built that facilitate immersive audience experiences of unprecedented musical performances. Composers are writing new pieces, and new versions of existing works are being produced to take advantage of these technologies. Spatial Audio enables pre-recorded, synthesized, and live reinforced sounds to arrive at the listener from any direction and allows the listener to move around in the space and explore the sonic experience. Active Acoustics provides early reflections and reverberance for the performers and audience throughout the room and can be adjusted for each composition. The physical acoustical design of the space needs to provide an appropriate nominal acoustic for both systems and accommodate performance audio that does not come from a fixed position and orientation to listeners who may not be in a fixed location and orientation. Both systems incorporate distributed loudspeakers that are typically integrated into the architecture yet have different electroacoustic objectives. How do these systems coexist? Installation examples that use Spacemap, a multichannel panner that originated in Australia, and Constellation, an Active Acoustics System that uses VRAS technology developed in New Zealand, illustrate design considerations when integrating these systems.
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Castañon, Angel. "My experience at threshold and the consultation process." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A236—A237. http://dx.doi.org/10.1121/10.0011178.
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I had the great opportunity to take part in the Acoustical Society of America’s (ASA) 2021Summer Undergraduate Research or Internship Experience in Acoustics (SURIEA) Program. The program was designed for underrepresented minority groups in order to introduce them to the field of acoustics. After a two-week crash course I was able to experience what it was like working in an architectural acoustic consultation firm and learn the extensive consultation process at Threshold. Not only that, but learning some of the programs, the methodology, skills, and purpose of Threshold as well. The impact of the program has certainly opened my eyes to the field of architectural acoustics, and how much work has to go into a project for the best possible outcome. In essence, I found the experience to be one of the most impactful I had in my life.
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Banerjee, Sourav. "Tuneable phononic crystals and topological acoustics." Open Access Government 42, no. 1 (April 15, 2024): 252–53. http://dx.doi.org/10.56367/oag-042-11436.
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Tuneable phononic crystals and topological acoustics Sourav Banerjee, Professor from the University of South Carolina, navigates the field of tuneable phononic crystals and topological acoustics. Acoustics, an age-old field of study, has recently revealed new physics with new degrees of freedom of wave propagation. These new findings are invaluable for information processing using acoustic modality. Information processing using acoustics is called acoustic computing. Computing Boolean algebra, which has already been demonstrated, could pave the pathways even for quantum computing using acoustics. Not in the very distant future, the recently discovered quantum and topological behavior of acoustics could be an integral part of computing modalities.
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Trenkel, Verena M., Nils Olav Handegard, and Thomas C. Weber. "Observing the ocean interior in support of integrated management." ICES Journal of Marine Science 73, no. 8 (July 31, 2016): 1947–54. http://dx.doi.org/10.1093/icesjms/fsw132.
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Abstract Active- and passive-acoustic methods are widely used tools for observing, monitoring, and understanding marine ecosystems. From 25 to 28 May 2015, 214 scientists from 31 nations gathered for an ICES symposium on Marine Ecosystem Acoustics (SoME Acoustics) to discuss three major themes related to acoustic observations of marine ecosystems: (i) recent developments in acoustic and platform technologies; (ii) acoustic characterisation of aquatic organisms, ecosystem structure, and ecosystem processes; and (iii) contribution of acoustics to integrated ecosystem assessments and management. The development of, and access to new instruments, such as broad bandwidth systems, enables insightful ecological studies and innovative management approaches. Unresolved ecological questions and the increasing move towards ecosystem based management pose further challenges to scientists and instrument developers. Considering the SoME Acoustics presentations in the context of three previous ICES symposia on fisheries acoustics, topics increasingly emphasize ecosystem studies and management. The continued expansion of work and progress in marine ecosystem acoustics is due to the cross-disciplinary work of fisheries acousticians, engineers, ecologists, modellers, and others. An analysis of the symposium co-authorship network reveals a highly connected acoustic science community collaborating around the globe.
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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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Brouckaert, Richard. "Automotive OEM acoustics - the ideal application for carbon neutral solutions." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 264, no. 1 (June 24, 2022): 917–24. http://dx.doi.org/10.3397/nc-2022-835.
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The Automotive acoustics arena is rich with application opportunities for carbon neutral or climate positive parts. Designing possible "green" NVH solutions however must never compromise the intended acoustical performance of the parts. This paper investigates the acoustical needs of OEM vehicles with an emphasis on applying green solutions. Furthermore, it demonstrates that vehicular acoustic performance need not be compromised as the industry moves down the road towards more climate friendly initiatives. This paper details that the traditional NVH treatment packages can easily be modified to create NVH solutions that quiet the vehicle without negatively affecting the planet. Lastly, the paper will identify what the writer considers to be ideal applications for planet friendly, carbon neutral NVH solutions using acoustical barrier applications specifically, that are production ready and commercially available today.
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MA, FUYIN, JIU HUI WU, and HAIYUN HOU. "PROGRESS IN PHYSIOLOGICAL ACOUSTICS." Journal of Mechanics in Medicine and Biology 13, no. 05 (October 2013): 1340007. http://dx.doi.org/10.1142/s0219519413400071.
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Physiological acoustics is a very hot topic in modern acoustic research, which is to study the hearing mechanism and the utterance of both humans and animals. It could be divided into two main aspects: physical acoustics of the ear and physiological acoustics. In physiological acoustics, there are some common research methods, such as objective experimental testing, subjective feelings evaluation survey statistical method, building the physical acoustic model and numerical simulation methods, etc. The authors are researching the accurate mathematical model of equal loudness curves, critical band and masking effects, by applying the holographic concept with several biological factors which are required to build a standard model. The cochlear emission information should be extracted from wavelet analysis method and two hearing protection technologies are being developed by band shielding.
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Crum, Lawrence A. "Acoustic cavitation and implosion acoustics." Journal of the Acoustical Society of America 100, no. 4 (October 1996): 2715. http://dx.doi.org/10.1121/1.416133.
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Chen, Huanyang, and C. T. Chan. "Acoustic cloaking and transformation acoustics." Journal of Physics D: Applied Physics 43, no. 11 (March 4, 2010): 113001. http://dx.doi.org/10.1088/0022-3727/43/11/113001.
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Pätynen, Jukka, and Tapio Lokki. "Evaluation of Concert Hall Auralization with Virtual Symphony Orchestra." Building Acoustics 18, no. 3-4 (December 2011): 349–66. http://dx.doi.org/10.1260/1351-010x.18.3-4.349.
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Authenticity of the simulation of room acoustics is evaluated by comparing auralizations with real recordings. Impulse responses are recorded in two concert halls with 34 loudspeakers positioned on the stage in the shape of an orchestra and a 3D microphone probe for spatial reproduction. The acoustics of the same concert halls are simulated with acoustics modeling software. B-format impulse responses are calculated by using the identical source and receiver positions as in the real halls. Additionally, two processing methods are applied to the simulated responses in order to decrease the difference in acoustical impression. Objective room acoustic parameters between the real and simulated halls are compared, and a listening test utilizing convolutions with anechoic orchestral music is organized. The results suggest that the subjects can be categorized in two groups having preference of brightness or naturalness. Depending on the music style, auralizations with processed responses are assessed equal or better than the real hall in terms of instrument balance and brightness.
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WALSH, TIMOTHY, GARTH REESE, CLARK DOHRMANN, and JERRY ROUSE. "FINITE ELEMENT METHODS FOR STRUCTURAL ACOUSTICS ON MISMATCHED MESHES." Journal of Computational Acoustics 17, no. 03 (September 2009): 247–75. http://dx.doi.org/10.1142/s0218396x0900394x.
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In this paper, a new technique is presented for structural acoustic analysis in the case of nonconforming acoustic–solid interface meshes. We first describe a simple method for coupling nonconforming acoustic–acoustic meshes, and then show that a similar approach, together with the coupling operators from conforming analysis, can also be applied to nonconforming structural acoustics. In the case of acoustic–acoustic interfaces, the continuity of acoustic pressure is enforced with a set of linear constraint equations. For structural acoustic interfaces, the same set of linear constraints is used, in conjunction with the weak formulation and the coupling operators that are commonly used in conforming structural acoustics. The constraint equations are subsequently eliminated using a static condensation procedure. We show that our method is equally applicable to time domain, frequency domain, and coupled eigenvalue analysis for structural acoustics. Numerical examples in both the time and frequency domains are presented to verify the methods.