Gotowe bibliografie tematyczne / Room acoustics

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Gotowa bibliografia na temat „Room acoustics”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 9 listopada 2024

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Artykuły w czasopismach na temat "Room acoustics"

Neidhardt, Annika, Christian Schneiderwind i Florian Klein. "Perceptual Matching of Room Acoustics for Auditory Augmented Reality in Small Rooms - Literature Review and Theoretical Framework". Trends in Hearing 26 (styczeń 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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Ellison, Steve, Pierre Germain i Roger Schwenke. "Making a room ready and ensuring success for active acoustics systems". Journal of the Acoustical Society of America 154, nr 4_supplement (1.10.2023): 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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Masih, Dawa A. A., Nawzad K. Jalal, Manar N. A. Mohammed i 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, nr 1 (1.03.2021): 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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Postma, Barteld N. J., i 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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Zhang, Zhichao, i Guangzheng Yu. "Influence of sound source directivity on finite element simulation of small-room acoustics". Journal of the Acoustical Society of America 152, nr 4 (październik 2022): A42. http://dx.doi.org/10.1121/10.0015479.

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Numerical simulation is a flexible and effective method for room acoustic design. Full-range simulation of room acoustics requires a combination of different numerical methods, in which wave acoustic methods (WAM) and geometric acoustic methods (GAM) are used for the low and high frequency region, respectively. In the general low-frequency WAM simulation, a sound source is often assumed to be a point source or loudspeakers are usually approximated by circular planar pistons. However, compared to a large room, the critical frequency between WAM and GAM should be higher in acoustic simulation of small rooms because of relative size between the wavelength and the room, and thus, the above simplifications of actual sound sources, typically loudspeakers, may lead to errors in terms of directivity in the frequency range that the WAM is applied for. Further errors in the desired room impulse responses or other room acoustic parameters caused by directivity errors needs quantitative analysis, and then evaluation can be made on whether it is necessary to consider a more accurate sound source directivity in the WAM simulation of small room acoustics.

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Gee, Kent L., Micah Shepherd, Brian E. Anderson, Tracianne B. Neilsen, Matthew S. Allen i Jonathan D. Blotter. "Graduate acoustics at Brigham Young University". Journal of the Acoustical Society of America 155, nr 3_Supplement (1.03.2024): 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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King, Richard, Wieslaw Woszczyk i Michail Oikonomidis. "Enhancement of virtual acoustics rendering using boundary mounted dipole loudspeakers". Journal of the Acoustical Society of America 155, nr 3_Supplement (1.03.2024): 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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Meyer-Kahlen, Nils, Sebastian J. Schlecht i Tapio Lokki. "Clearly audible room acoustical differences may not reveal where you are in a room". Journal of the Acoustical Society of America 152, nr 2 (sierpień 2022): 877–87. http://dx.doi.org/10.1121/10.0013364.

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A common aim in virtual reality room acoustics simulation is accurate listener position dependent rendering. However, it is unclear whether a mismatch between the acoustics and visual representation of a room influences the experience or is even noticeable. Here, we ask if listeners without any special experience in echolocation are able to identify their position in a room based on the acoustics alone. In a first test, direct comparison between acoustic recordings from the different positions in the room revealed clearly audible differences, which subjects described with various acoustic attributes. The design of the subsequent experiment allows participants to move around and explore the sound within different zones in this room while switching between visual renderings of the zones in a head-mounted display. The results show that identification was only possible in some special cases. In about 74% of all trials, listeners were not able to determine where they were in the room. The results imply that audible position dependent room acoustic rendering in virtual reality may not be noticeable under certain conditions, which highlights the importance of evaluation paradigm choice when assessing virtual acoustics.

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Allen, Matthew S., Brian E. Anderson, Jonathan D. Blotter, Kent L. Gee, Tracianne B. Neilsen, Micah Shepherd i Scott D. Sommerfeldt. "Graduate acoustics at Brigham Young University". Journal of the Acoustical Society of America 152, nr 4 (październik 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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Woszczyk, Wieslaw. "Active Acoustics in Concert Halls - A New Approach". Archives of Acoustics 36, nr 2 (1.05.2011): 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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Rozprawy doktorskie na temat "Room acoustics"

Durany, Vendrell Jaume. "Geometrical room acoustics: ray based simulation for room acoustics". Doctoral thesis, Universitat Pompeu Fabra, 2016. http://hdl.handle.net/10803/395190.

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L’acústica de sales és la ciència encarregada d’estudiar la propagació del so en entorns tancats. La informació acústica de qualsevol entorn, coneguda com la resposta impulsional, s’expressa en termes del camp acústic com una funció de l’espai i el temps. La formulació analítica de la distribució de les variables del so és, en general, extremadament complexa d’obtenir i només existeixen solucions d’escenaris molt simples i irreals. Per tant, l’ús d’ordinadors per solucionar aquest tipus de problemes ha emergit com una alternativa adequada per calular funcions de resposta. En aquesta Tesi ens hem centrat en l’ús de mètodes basats en rajos per calcular funcions de resposta. Més concretament, presentem el disseny i la implementació d’un motor de traçat de rajos que calcula funcions de resposta en cualsevol entorn virtual, obtenint no només la funció de resposta per la presió sinó també pel vector de velocitats del camp acústic. Amb aquesta informació extra tenim totes les dades necessàries per modelar la propagació del so i podem de forma natural espacialitzar un so per qualsevol configuració d’altaveus. Aquesta recerca contribueix als aspectes principals del càlcul de funcions de resposta utilitzant mètodes basats en rajos. El motor de traçat de rajos que presentem inclou un mètode desenvolupat per aplicar la solució analítica de la Funció de Distribució Acústica de Reflectància Bidireccional (A-BRDF) al Model de Dispersió Basat en Vectors (VBS), fet que redueix molt notablement el cost computacional.
Room acoustics is the science devoted to study sound propagation in enclosures where the sound conduction medium is bounded on all sides by walls, ceiling and floor. The acoustic information of any room, the so-called impulse response, is expressed in terms of the acoustic field as a function of space and time. The analytical formulation of the sound variables distribution is, in general, extremely hard to obtain and there only exist solutions of very simple and unrealistic scenarios. Therefore the use of computers for solving this type of problems has emerged as a proper alternative to calculate impulse responses. In this Thesis we focus on the use of the ray-based methods to compute impulse responses. More precisely, we present the design and implementation of a sound ray tracing engine that computes the impulse response in any given environment not only for the pressure but also for the velocity vector of the acoustic field. With this extra information we have all the necessary data to model the propagation of sound and we can then naturally spatialize the sound to any speakers layout. This research contributes to the main aspects in the computation of impulse responses using a ray-based approach. The presented ray tracing engine includes a method developed to apply the analytical solution for the Acoustic Bidirectional Reflectance Distribution Function (A-BRDF) in the Vector Based Scattering Model (VBS), which reduces dramatically the computational cost.

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Liddy, David W. Holmes John F. "Acoustic room de-reverberation using time-reversal acoustics /". Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA374579.

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Thesis (M.S. in Applied Physics) Naval Postgraduate School, September 1999.
"September 1999". Thesis advisor(s):, Andrés Larraza, Bruce C. Denardo. Includes bibliographical references (p. 49). Also available online.

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Liddy, David W., i John F. Holmes. "Acoustic room de-reverberation using time-reversal acoustics". Thesis, Monterey, California: Naval Postgraduate School, 1999. http://hdl.handle.net/10945/13698.

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This thesis probes the performance of one-channel time-reversal acoustics in a chamber in terms of the geometry of the cavity. In particular, a rectangular chamber is compared to an enclosure that has a stadium shape. The mode structure in the rectangular cavity is highly symmetric, while it is highly irregular in the stadium-shaped cavity. Time- reversal acoustic techniques produce an improved focus in the latter. The focusing quality is determined as a function of frequency, time-reversal window size, and spatial extent. A scheme for encrypted acoustic communication, both in air and underwater, that uses multiple broadband signals with identical bandwidth, Hanning window source spectra, and center frequencies separated by half the bandwidth, allowing for null detection between adjacent signals, is successfully investigated.

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Smurzynski, Jacek. "Acoustic Foundations of Signal Enhancement and Room Acoustics". Digital Commons @ East Tennessee State University, 2007. https://www.amzn.com/1597565628.

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Book Summary: Chermak and Musiek's two-volume, award-winning handbooks are back in newly revised editions. Extensively revised and expanded, Volume II provides expanded coverage of rehabilitative and professional issues, detailing intervention strategies for children and adults. Volume I provides comprehensive coverage of the auditory neuroscience and clinical science needed to accurately diagnose the range of developmental and acquired central auditory processing disorders in children, adults, and older adults. Building on the excellence achieved with the best-selling 1st editions which earned the 2007 Speech, Language, and Hearing Book of the Year Award the second editions include contributions from world-renowned authors detailing major advances in auditory neuroscience and cognitive science; diagnosis; best practice intervention strategies in clinical and school settings; as well as emerging and future directions in diagnosis and intervention.

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Hatlevik, Espen. "Are Musicians Affected by Room Acoustics in Rehearsal Rooms?" Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18839.

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This study has investigated to what extent musicians adjust their source levels to different music rehearsal rooms. In the experiment, six amateur musicians were to perform the same song i four different rehearsal rooms, by first singing, then by playing guitar and last by combining singing with guitar playing. All sound sources were recorded and analyzed. The results shows that the average musician adjusts his source levels to the rehearsal room and that most of the adjustments are made in the guitar playing. Looking at the individual musician there are some that do not show any signs as to being affected by the rooms, and there are some that shows clear signs of being affected by the rehearsal room. The result also shows that the musicians are affected differently by different acoustic parameters, whereas the strength shows the least correlation and reverberation time shows the most correlation to the adjustment made by the average musician.

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Priede, Gareth. "Room acoustics : an investigation into the computer simulation of room acoustics, with special reference to Jameson Hall". Thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/5120.

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Bibliography: leaves 138-141.
This thesis consists of essentially two parts. The first deals with the theory and measurement of room acoustics while the second examines the room acoustic prediction methods.

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Zhang, Wei. "Simulation and experimental study of room acoustics". Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27311.

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Sound propagation is a complex subject, especially in an enclosure. The study of room acoustics involves not only a research into how sound is propagated in a room, but also a search into how to measure sound under different condition and how to control sound in the case of various wall materials. For an acoustical environment, there are three separated parts: sound sources, room acoustics, and the listens. These three items form a source-medium-receiver chain, which is typical for most of communication models. In this thesis, the image method is applied to predict the acoustical quality of a real room, and the experiment for room acoustic measurement is set up. The simulation model using image method proved the design of the measurement system is efficient for room acoustics.

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Spa, Carvajal Carlos. "Time-domain numerical methods in room acoustics simulations". Doctoral thesis, Universitat Pompeu Fabra, 2009. http://hdl.handle.net/10803/7565.

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L'acústica de sales s'encarrega de l'estudi del comportament de les ones sonores en espais tancats.La informació acústica de qualsevol entorn, coneguda com la resposta impulsional, pot ser expressada en termes del camp acústic com una funció de l'espai i el temps. En general, és impossible obtenir solucions analítiques de funcions resposta en habitacions reals. Per tant, en aquests últims anys, l'ús d'ordinadors per resoldre aquest tipus de problemes ha emergit com una solució adecuada per calcular respostes impulsionals.
En aquesta Tesi hem centrat el nostre anàlisis en els mètodes basats en el comportament ondulatori dins del domini temporal. Més concretament, estudiem en detall les formulacions més importants del mètode de Diferències Finites, el qual s'utilitza en moltes aplicacions d'acústica de sales, i el recentment proposat mètode PseudoEspectral de Fourier. Ambdós mètodes es basen en la formulació discreta de les equacions analítiques que descriuen els fenòmens acústics en espais tancats.
Aquesta obra contribueix en els aspectes més importants en el càlcul numèric de respostes impulsionals: la propagació del so, la generació de fonts i les condicions de contorn de reactància local.
Room acoustics is the science concerned to study the behavior of sound waves in enclosed rooms. The acoustic information of any room, the so called impulse response, is expressed in terms of the acoustic field as a function of space and time. In general terms, it is nearly impossible to find analytical impulse responses of real rooms. Therefore, in the recent years, the use of computers for solving this type of problems has emerged as a proper alternative to calculate the impulse responses.
In this Thesis we focus on the analysis of the wavebased methods in the timedomain. More concretely, we study in detail the main formulations of FiniteDifference methods, which have been used in many room acoustics applications, and the recently proposed Fourier PseudoSpectral methods. Both methods are based on the discrete formulations of the analytical equations that describe the sound phenomena in enclosed rooms.
This work contributes to the main aspects in the computation of impulse responses: the wave propagation, the source generation and the locallyreacting boundary conditions.

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Murphy, Damian Thomas. "Digital waveguide mesh topologies in room acoustics modelling". Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313846.

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Hargreaves, J. A. "Time domain boundary element method for room acoustics". Thesis, University of Salford, 2007. http://usir.salford.ac.uk/16604/.

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This thesis is about improving the suitability of the time domain Boundary Element Method (BEM) for predicting the scattering from surface treatments used to improve the acoustics of rooms. The discretised integral equations are typically solved by marching on in time from initial silence; however, this being iterative has potential for divergence. Such instability and high computational cost have prohibited the time domain BEM from widespread use. The underlying integral equation is known to not possess unique solutions at certain frequencies, physically interpreted as cavity resonances, and these manifest as resonant poles, all excited and potentially divergent due to numerical error. This has been addressed by others using the combined field integral equation; an approach built upon in this thesis. Accuracy and stability may also be compromised by poor discretisation and integration accuracy. The latter is investigated on real-world surfaces, demonstrating that the popular Gaussian integration schemes are not suitable in some circumstances. Instead a contour integration scheme capable of resolving the integrands‟ singular nature is developed. Schroeder diffusers are Room Acoustic treatments which comprise wells separated by thin fins. The algorithm is extended to model such surfaces, applying the combined field integral equation to the body and an open surface model to the fins. It is shown that this improves stability over an all open surface model. A new model for compliant surfaces is developed, comparable to the surface impedance model used in the frequency domain. This is implemented for surfaces with welled and absorbing sections, permitting modelling of a Schroeder diffuser as a box with surface impedances that simulate the delayed reflections caused by the wells. A Binary Amplitude Diffuser - a partially absorbing diffuser - is also modelled. These new models achieve good accuracy but not universal stability and avenues of future research are proposed to address the latter issue.

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Książki na temat "Room acoustics"

Kuttruff, Heinrich. Room Acoustics. Sixth edition. | Boca Raton : CRC Press, [2017]: CRC Press, 2016. http://dx.doi.org/10.1201/9781315372150.

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Kuttruff, Heinrich. Room acoustics. Wyd. 4. London, [England]: Spon Press, 2000.

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Mechel, Fridolin. Room Acoustical Fields. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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Januarsari, Trinanda Rainy. Introducing diffuse surface reflection into the Odeon room acoustics program. Salford: University of Salford, 1993.

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Mechel, Fridolin. Room Acoustical Fields. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-22356-3.

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Bradley, J. S. Uniform derivation of optimum conditions for speech in rooms. Ottawa: National Research Council of Canada, 1985.

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Walker, R. Acoustic noise criteria for listening rooms and control rooms. London: British Broadcasting Corporation. Research and Development Department, 1994.

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Walker, R. High frequency room responses: Acoustic design and the control of stereophonic image quality. London: British Broadcasting Corporation. Research and Development Department, 1994.

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Music Educators National Conference (U., red. Music facilities: Building, equipping, and renovating. Reston, VA: Music Educators National Conference, 1987.

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Geerdes, Harold P. Music facilities: Building, equipping, and renovating. Reston, Va. (1902 Association Dr., Reston 22091): Music Educators National Conference, 1987.

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Części książek na temat "Room acoustics"

Pierce, Allan D. "Room Acoustics". W Acoustics, 291–360. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11214-1_6.

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Kuttruff, Heinrich. "Some facts on sound waves, sources and hearing". W Room Acoustics, 1–22. Sixth edition. | Boca Raton : CRC Press, [2017]: CRC Press, 2016. http://dx.doi.org/10.1201/9781315372150-1.

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Kuttruff, Heinrich. "Electroacoustical systems in rooms". W Room Acoustics, 267–93. Sixth edition. | Boca Raton : CRC Press, [2017]: CRC Press, 2016. http://dx.doi.org/10.1201/9781315372150-10.

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Kuttruff, Heinrich. "Reflection and scattering". W Room Acoustics, 23–50. Sixth edition. | Boca Raton : CRC Press, [2017]: CRC Press, 2016. http://dx.doi.org/10.1201/9781315372150-2.

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Kuttruff, Heinrich. "Sound waves in a room". W Room Acoustics, 51–79. Sixth edition. | Boca Raton : CRC Press, [2017]: CRC Press, 2016. http://dx.doi.org/10.1201/9781315372150-3.

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Kuttruff, Heinrich. "Geometrical room acoustics". W Room Acoustics, 81–102. Sixth edition. | Boca Raton : CRC Press, [2017]: CRC Press, 2016. http://dx.doi.org/10.1201/9781315372150-4.

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Kuttruff, Heinrich. "Reverberation and steady-state energy density". W Room Acoustics, 103–24. Sixth edition. | Boca Raton : CRC Press, [2017]: CRC Press, 2016. http://dx.doi.org/10.1201/9781315372150-5.

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Kuttruff, Heinrich. "Sound absorption and sound absorbers". W 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. "Subjective room acoustics". W Room Acoustics, 157–92. Sixth edition. | Boca Raton : CRC Press, [2017]: CRC Press, 2016. http://dx.doi.org/10.1201/9781315372150-7.

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Kuttruff, Heinrich. "Measuring techniques in room acoustics". W Room Acoustics, 193–229. Sixth edition. | Boca Raton : CRC Press, [2017]: CRC Press, 2016. http://dx.doi.org/10.1201/9781315372150-8.

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Streszczenia konferencji na temat "Room acoustics"

Chen, Ziyang, Israel D. Gebru, Christian Richardt, Anurag Kumar, William Laney, Andrew Owens i Alexander Richard. "Real Acoustic Fields: An Audio-Visual Room Acoustics Dataset and Benchmark". W 2024 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 21886–96. IEEE, 2024. http://dx.doi.org/10.1109/cvpr52733.2024.02067.

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KUTTRUFF, H. "RETROSPECTIVE ROOM ACOUSTICS". W Spring Conference Acoustics 2005. Institute of Acoustics, 2023. http://dx.doi.org/10.25144/17912.

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BREDVEI, Ø., TV TRONSTAD i JL NIELSEN. "TELEPRESENCE ROOM ACOUSTICS". W Auditorium Acoustics 2008. Institute of Acoustics, 2023. http://dx.doi.org/10.25144/17518.

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KHRYSTOSLAVENKO, Olga, i Raimondas GRUBLIAUSKAS. "SIMULATION OF ROOM ACOUSTICS USING COMSOL MULTIPHYSICS". W Conference for Junior Researchers „Science – Future of Lithuania“. VGTU Technika, 2017. http://dx.doi.org/10.3846/aainz.2017.06.

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The modeling programs provide a wide range of possibilities for simulating acoustic systems. This paper describes programs used in acoustics for various purposes, such as Sound PLAN, AFMG SoundFlow, WinFLAG, Comsol multiphysics, ANSYS, Roomsim. For the purposes of the current research, the acoustic simulation of the room was carried out. Physical parameters as impedance, sound hard boundary and normal velocity were considered. The sound pressure level in rooms was investigated. Possibilities of using Comsol Multiphysics in the research of acoustics were investigated. Results of the current research show high-frequency eigenmodes located in the corners of the room and in the center of the room. Sound pressure level increased from low to medium frequency and then decreased with frequency drifts. At the frequency of 5000 Hz, minimum sound pressure is observed, which is associated with the decrease in the wavelength co-occurring with the decrease in frequency.

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Vorlander, M. "NEWS FROM ROOM ACOUSTICS". W ACOUSTICS 2021. Institute of Acoustics, 2021. http://dx.doi.org/10.25144/13755.

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

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Munshi, A. S. "Equalizability of room acoustics". W [Proceedings] ICASSP-92: 1992 IEEE International Conference on Acoustics, Speech, and Signal Processing. IEEE, 1992. http://dx.doi.org/10.1109/icassp.1992.226081.

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HALMRAST, T., i A. BUEN. "SIMPLIFIED ROOM ACOUSTIC MEASUREMENTS". W Auditorium Acoustics 2008. Institute of Acoustics, 2023. http://dx.doi.org/10.25144/17523.

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BRADLEY, JS. "USING ROOM ACOUSTICS MEASURES TO UNDERSTAND A LARGE ROOM AND SOUND REINFORCEMENT SYSTEM". W Auditorium Acoustics 2011. Institute of Acoustics, 2023. http://dx.doi.org/10.25144/16844.

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MEYNIAL, X., i H. LISSEK. "ACTIVE REFLECTORS FOR ROOM ACOUSTICS". W Auditorium Acoustics 1999. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/18803.

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Raporty organizacyjne na temat "Room acoustics"

Deryabin, I. V. Noise-absorbing panel with bypass channels. FORGING AND STAMPING PRODUCTION. MATERIAL WORKING BY PRESSURE, sierpień 2023. http://dx.doi.org/10.12731/kshpomd62023-deryabin.

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Noise, having a harmful effect on humans and the environment, forces us to search and conduct research on the development of new methods and means of noise protection. Currently, with an increasing increase in the flow of vehicles in residential areas, with the development of industrial production, the issue of noise control is becoming particularly relevant. A well-known and effective technical solution for blocking the transmission of acoustic energy is the use of noise-absorbing panels, both as part of various soundproof structures, and in the form of separate acoustic elements installed in noisy rooms. The article discusses the design of a noise-absorbing panel containing through bypass channels. Such a panel has a broadband sound absorption effect in frequency composition due to the use of porous sound-absorbing structures of structural materials with the integration of bypass channels into their composition.

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Hart, Carl. Vibration survey of Room 47 with a laser doppler vibrometer : Main Laboratory Basement, U.S. Army ERDC-CRREL. Engineer Research and Development Center (U.S.), listopad 2020. http://dx.doi.org/10.21079/11681/38919.

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Plans are underway to create an acousto-optic laboratory on the campus of the Cold Regions Research and Engineering Laboratory. For this purpose, existing space in the basement of the Main Laboratory will be renovated. Demanding measurement techniques, such as interferometry, require a sufficiently quiet vibration environment (i.e., low vibration levels). As such, characterization of existing vibration conditions is necessary to determine vibration isolation requirements so that highly sensitive measurement activities are feasible. To this end, existing vibro-acoustic conditions were briefly surveyed in Room 47, a part of the future laboratory. The survey measured ambient noise and ambient vertical floor vibrations. The ambient vibration environment was characterized according to generic velocity criteria (VC), which are one-third octave band vibration limits. At the time of the survey, the ambient vibration environment fell under a VC-A designation, where the tolerance limit is 2000 μin/s across all one-third octave bands. Under this condition, highly sensitive measurement activities are feasible on a vibration-isolated working surface. The conclusion of this report provides isolation efficiency requirements that satisfy VC-E limits (125 μin/s), which are necessary for interferometric measurements.

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Hallett, J. B. L51525 Sizing of Girth Weld Defects Using Focused Ultrasonic Beams. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), styczeń 1987. http://dx.doi.org/10.55274/r0010202.

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This project was produced to evaluate the performance of focused beams in sizing and positioning defects in pipeline girth welds. The sound beams from standard flat transducers were focused using acoustic lenses. Two types of plastics, having different sound velocities are used in the design of these lenses. One is used for the lens and the other for the wedge. The profile of the lens/wedge boundary was designed to focus the sound at a selected depth. The design takes into account the beam angle, beam diameter, focal point and working range required. The effects of test surface curvature were also incorporated into the design. This project was conducted in three phases using sample welds containing real defects, such as root cracks, slag and lack of sidewall fusion. In Phase III the individual defect size predictions were compared to the actual defects found during destructive examination. Only the readings where the signal sources could be positively identified as defects by breaking open or sectioning were included. All measurements were made to the nearest 0.5 mm (0.02 inches).

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Galili, Naftali, Roger P. Rohrbach, Itzhak Shmulevich, Yoram Fuchs i Giora Zauberman. Non-Destructive Quality Sensing of High-Value Agricultural Commodities Through Response Analysis. United States Department of Agriculture, październik 1994. http://dx.doi.org/10.32747/1994.7570549.bard.

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The objectives of this project were to develop nondestructive methods for detection of internal properties and firmness of fruits and vegetables. One method was based on a soft piezoelectric film transducer developed in the Technion, for analysis of fruit response to low-energy excitation. The second method was a dot-matrix piezoelectric transducer of North Carolina State University, developed for contact-pressure analysis of fruit during impact. Two research teams, one in Israel and the other in North Carolina, coordinated their research effort according to the specific objectives of the project, to develop and apply the two complementary methods for quality control of agricultural commodities. In Israel: An improved firmness testing system was developed and tested with tropical fruits. The new system included an instrumented fruit-bed of three flexible piezoelectric sensors and miniature electromagnetic hammers, which served as fruit support and low-energy excitation device, respectively. Resonant frequencies were detected for determination of firmness index. Two new acoustic parameters were developed for evaluation of fruit firmness and maturity: a dumping-ratio and a centeroid of the frequency response. Experiments were performed with avocado and mango fruits. The internal damping ratio, which may indicate fruit ripeness, increased monotonically with time, while resonant frequencies and firmness indices decreased with time. Fruit samples were tested daily by destructive penetration test. A fairy high correlation was found in tropical fruits between the penetration force and the new acoustic parameters; a lower correlation was found between this parameter and the conventional firmness index. Improved table-top firmness testing units, Firmalon, with data-logging system and on-line data analysis capacity have been built. The new device was used for the full-scale experiments in the next two years, ahead of the original program and BARD timetable. Close cooperation was initiated with local industry for development of both off-line and on-line sorting and quality control of more agricultural commodities. Firmalon units were produced and operated in major packaging houses in Israel, Belgium and Washington State, on mango and avocado, apples, pears, tomatoes, melons and some other fruits, to gain field experience with the new method. The accumulated experimental data from all these activities is still analyzed, to improve firmness sorting criteria and shelf-life predicting curves for the different fruits. The test program in commercial CA storage facilities in Washington State included seven apple varieties: Fuji, Braeburn, Gala, Granny Smith, Jonagold, Red Delicious, Golden Delicious, and D'Anjou pear variety. FI master-curves could be developed for the Braeburn, Gala, Granny Smith and Jonagold apples. These fruits showed a steady ripening process during the test period. Yet, more work should be conducted to reduce scattering of the data and to determine the confidence limits of the method. Nearly constant FI in Red Delicious and the fluctuations of FI in the Fuji apples should be re-examined. Three sets of experiment were performed with Flandria tomatoes. Despite the complex structure of the tomatoes, the acoustic method could be used for firmness evaluation and to follow the ripening evolution with time. Close agreement was achieved between the auction expert evaluation and that of the nondestructive acoustic test, where firmness index of 4.0 and more indicated grade-A tomatoes. More work is performed to refine the sorting algorithm and to develop a general ripening scale for automatic grading of tomatoes for the fresh fruit market. Galia melons were tested in Israel, in simulated export conditions. It was concluded that the Firmalon is capable of detecting the ripening of melons nondestructively, and sorted out the defective fruits from the export shipment. The cooperation with local industry resulted in development of automatic on-line prototype of the acoustic sensor, that may be incorporated with the export quality control system for melons. More interesting is the development of the remote firmness sensing method for sealed CA cool-rooms, where most of the full-year fruit yield in stored for off-season consumption. Hundreds of ripening monitor systems have been installed in major fruit storage facilities, and being evaluated now by the consumers. If successful, the new method may cause a major change in long-term fruit storage technology. More uses of the acoustic test method have been considered, for monitoring fruit maturity and harvest time, testing fruit samples or each individual fruit when entering the storage facilities, packaging house and auction, and in the supermarket. This approach may result in a full line of equipment for nondestructive quality control of fruits and vegetables, from the orchard or the greenhouse, through the entire sorting, grading and storage process, up to the consumer table. The developed technology offers a tool to determine the maturity of the fruits nondestructively by monitoring their acoustic response to mechanical impulse on the tree. A special device was built and preliminary tested in mango fruit. More development is needed to develop a portable, hand operated sensing method for this purpose. In North Carolina: Analysis method based on an Auto-Regressive (AR) model was developed for detecting the first resonance of fruit from their response to mechanical impulse. The algorithm included a routine that detects the first resonant frequency from as many sensors as possible. Experiments on Red Delicious apples were performed and their firmness was determined. The AR method allowed the detection of the first resonance. The method could be fast enough to be utilized in a real time sorting machine. Yet, further study is needed to look for improvement of the search algorithm of the methods. An impact contact-pressure measurement system and Neural Network (NN) identification method were developed to investigate the relationships between surface pressure distributions on selected fruits and their respective internal textural qualities. A piezoelectric dot-matrix pressure transducer was developed for the purpose of acquiring time-sampled pressure profiles during impact. The acquired data was transferred into a personal computer and accurate visualization of animated data were presented. Preliminary test with 10 apples has been performed. Measurement were made by the contact-pressure transducer in two different positions. Complementary measurements were made on the same apples by using the Firmalon and Magness Taylor (MT) testers. Three-layer neural network was designed. 2/3 of the contact-pressure data were used as training input data and corresponding MT data as training target data. The remaining data were used as NN checking data. Six samples randomly chosen from the ten measured samples and their corresponding Firmalon values were used as the NN training and target data, respectively. The remaining four samples' data were input to the NN. The NN results consistent with the Firmness Tester values. So, if more training data would be obtained, the output should be more accurate. In addition, the Firmness Tester values do not consistent with MT firmness tester values. The NN method developed in this study appears to be a useful tool to emulate the MT Firmness test results without destroying the apple samples. To get more accurate estimation of MT firmness a much larger training data set is required. When the larger sensitive area of the pressure sensor being developed in this project becomes available, the entire contact 'shape' will provide additional information and the neural network results would be more accurate. It has been shown that the impact information can be utilized in the determination of internal quality factors of fruit. Until now,

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Book reviews: Room Acoustics: Design and Modeling; Array Signal Processing: Concepts and Techniques; Acoustics in Building Rehabilitation; and Virtual Experiments in Mechanical Vibrations: Structural Dynamics and Signal Processing. Sociedade Brasileira de Acústica (Sobrac), grudzień 2022. http://dx.doi.org/10.55753/aev.v37e54.201.

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In this issue, this section presents four book reviews, with the first and the last being written by the authors themselves. A novelty is that all of them are also available in English language (Portuguese versions are also available on page 101). We remind you that the reviews are written in an abbreviated and concise way to summarize the content of the books (on subjects related to the various sciences involving acoustics, vibrations, and audio) and to bring information about the authors (to further contextualize the works). We present reviews of the following books in this issue: Room Acoustics: Design and Modeling (Acústica de Salas: Projeto e Modelagem) Author: Eric Brandão | Blucher, 2016 Array Signal Processing: Concepts and Techniques Authors: Don H. Johnson and Dan E. Dudgeon | Prentice Hall, 1993. Acoustics in Building Rehabilitation (A Acústica na Reabilitação de Edifícios) Author: Jorge Patrício | Engebook, 2018 (4 ed.) Virtual Experiments in Mechanical Vibrations: Structural Dynamics and Signal Processing Authors: Bin Tang and Michael J. Brennan | Wiley, 2022 Eric Brandão, professor of the Acoustical Engineering Program (EAC) at the Federal University of Santa Maria (UFSM, Brazil), presents his book on Room Acoustics (a subject he teaches in the program) — the book was technically revised by William D’Andrea Fonseca (who is an EAC professor as well). The work won the Jabuti Prize (2017) and is in its first revised edition. Next, we have a classic, “Array Signal Processing”, by American professors Don H. Johnson and Dan E. Dudgeon, a must-read for studies on the subject that deal with mechanical or electromagnetic waves. The third book is authored by Jorge Patrício (professor in Portugal), who is a reference in Building Acoustics. Finally, we have the book “Virtual Experiments in Mechanical Vibrations: Structural Dynamics and Signal Processing”, by Bin Tang and Michael J. Brennan, who write the review of their own book (an international collaboration). We hope that reading the reviews offers an initial understanding and good impression about the studies and awakens the desire to know them in their entirety: an excellent way to expand knowledge and keep up to date in the field.

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Early detection of room fires through acoustic emission. Gaithersburg, MD: National Institute of Standards and Technology, 1993. http://dx.doi.org/10.6028/nist.ir.5269.

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POWER FLOW ANALYSIS OF BRIDGE U-RIB STIFFENED PLATES BASED ON THE CONCEPT OF STRUCTURAL INTENSITY. The Hong Kong Institute of Steel Construction, sierpień 2022. http://dx.doi.org/10.18057/icass2020.p.061.

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Due to its advantages of good mechanical properties, simple appearance and strong adaptability, the steel box girder is being widely utilized in urban bridges. The noise radiated by steel box girders subjected to vehicle impacts has the characteristics of wide-spectrum, high-magnitude and control difficulty. U-rib stiffened roof, as a part of the steel box girder, directly bears the input load, which is the basis of studying the vibration of the steel box girder. Currently, the investigation on the vibro-acoustic performance of U-rib plates is very limited. With this regard, this paper introduces the concept of Structural Intensity (SI). The SI vector is calculated by the Finite Element (FE) method. The power flow is visualized by the self-programming post-processing code. The global and local vibration energy transmission characters of a U-rib stiffened plate under a harmonic nodal force are analyzed. Further, the influence of plate thickness is investigated. The optimum design is carried out based on the engineering standard dimensions. The research results indicate that increasing the thickness ratio of the U-rib to the baseplate is beneficial to reducing the vibration.

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