Recent studies on acoustically coupled volumes, worship spaces, and in concert hall acoustics, have prompted an increasing interest in analyzing sound energy decays consisting of more than one decay slope, so-called n...
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An important element of architectural acoustic design is the prediction and mitigation of modal effects. Modal effects can create undesirable aural phenomena, especially in smaller rooms. The use of Bayesian methods f...
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ISBN:
(纸本)9781627485609
An important element of architectural acoustic design is the prediction and mitigation of modal effects. Modal effects can create undesirable aural phenomena, especially in smaller rooms. The use of Bayesian methods for spectrum analysis was pioneered originally in the field of nuclear magnetic resonance spectroscopy. A time-domain model may be used with methods of Bayesian inference to analogously analyze room modes, accounting for frequency, amplitude, damping, and phase. Bayesian model selection can be used to determine the number of modes present in the signal, while simultaneously estimating the associated modal parameters. Accuracy of the method is demonstrated using simulated data, addressing scenarios like well-spaced modes, overlapping modes, and unevenly damped degenerate modes. Then, the method's usefulness is demonstrated by running it against real, measured impulse responses. Finally, the Bayesian model-based approach is compared to more standard frequency-domain analyses.
This study investigates the effect of head movement in the evaluation of listener envelopment [LEV] and apparent source width [ASW] under 15 different concert hall conditions simulated over eight loudspeakers using Vi...
ISBN:
(纸本)9781618393968
This study investigates the effect of head movement in the evaluation of listener envelopment [LEV] and apparent source width [ASW] under 15 different concert hall conditions simulated over eight loudspeakers using Virtual Microphone Control. The conditions consist of varying ratios of front-to-back energy and varying coherence levels of cross-correlated reverberant energy. Head movements are monitored in terms of angular rotation using a head tracker while listeners are prompted to assign subjective ratings of LEV and ASW. The tests are repeated while listeners are asked to keep their heads fixed. Head movements are analysed and results of the tests are compared.
Visualizations based on a diffusion equation model are presented for transient sound energy in a two coupled-room system. Animations of time-dependent energy flow directions visualize the energy flows across coupled s...
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ISBN:
(纸本)9781615676903
Visualizations based on a diffusion equation model are presented for transient sound energy in a two coupled-room system. Animations of time-dependent energy flow directions visualize the energy flows across coupled spaces. Particularly, the sound energy feedback is identified through the energy flow direction changes when the coupled room is more reverberant than the main room. This study reveals a "reversal" characteristic of energy flow directions which seems to be dependent on the size and the location of the aperture. Through Bayesian decay analysis and sound energy flow modeling, this work also discloses that the turning point on double-sloped energy decay is highly correlated to the time instant when the energy flow direction reverses.
Aerogel is a material with unique nanoscale properties. In monolithic form aerogel is too costly to be practically used in acoustic applications. Recently a cost-effective technique for producing granular aerogel has ...
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ISBN:
(纸本)9781618392800
Aerogel is a material with unique nanoscale properties. In monolithic form aerogel is too costly to be practically used in acoustic applications. Recently a cost-effective technique for producing granular aerogel has been developed, but the acoustic properties of granulated aerogel were not well known. The normal incident acoustic absorption and attenuation of three configurations of granulated aerogel have been determined by means of the transfer function and the transmission matrix methods of measuring normal induct acoustic properties: using the granules as a loose fill, woven into glass fiber blankets, and bound into a solid plate with a poly-vinyl acetate binder. Measurements were conducted using a 64 m impedance tube, the design of which is also discussed.
Technology advances in computer simulation such as auralization has brought a new perspective in acoustic research. The possibility to simulate a space, play a sound source and listen to the result made possible to op...
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Recent researches propose the integration of performance analysis to early stages of the design process in order to obtain the building's best final performance (Kolarevric;Malkawi, 2005;Holzer, 2010;Oxman, 2007)....
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To reduce the cost of training models for each language for developers of natural language processing applications, pre-trained multilingual sentence encoders are promising. However, since training corpora for such mu...
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Industrial change and the resultant restructuring of employment opportunity ongoing in the nation's largest cities are seriously weakening traditional ladders of urban social advancement. Jobs at the high end of t...
A model-based design approach for microperforated panel absorbers comprised of multiple panel layers is developed. Microperforated panels (MPPs) are becoming increasingly popular as sound absorbers, capable of providi...
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