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133rd Audio Engineering Society Convention 2012, AES 2012

作者： Xie, Bo-Sun Shi, Bei Xiang, Ning Physics Dept. School of Science South China University of Technology Guangzhou 510641 China Graduate Program in Architectural Acoustics Rensselaer Polytechnic Institute School of Architecture 12180 Troy NY United States

ISBN: (纸本)9781622766031

An algorithm of audio signal dccorrclation is proposed. The algorithm is based on a pair of all-pass filters whose responses match with a pair of reciprocal maximal length sequences (MLSs). Taking advantage of the characters of uniform power spectrum and low-valued cross-correlation of reciprocal MLSs, the filters create a pair of output signals with low cross-correlation but almost identical magnitude spectra to the input signal. The proposed algorithm is applied to broadening the auditory source-width and enhancing subjective envelopment in multichannel sound reproduction. Preliminary psychoacoustic experiments validate the performance of the proposed algorithm.

关键词： Bandpass filters

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Specific acoustic impedance estimation;Bayesian-network-based inverse finite difference frequency domain method

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Proceedings of Meetings on Acoustics 2013年第1期19卷

作者： Alexander Bockman Cameron Fackler Ning Xiang Lincoln Laboratory Massachusetts Institute of Technology Lexington MA 02421 Graduate Program in Architectural Acoust. School of Architecture Rensselaer Polytechnic Inst. Troy NY 12180 Graduate Program in Architectural Acoustics Rensselaer Polytechnic Institute 110 8th St. Greene Bldg. Troy NY 12180

Design for acoustic performance for an interior fluid domain requires accurate description of boundary materials' specific acoustic impedance. The standard approach for the estimation of this material characteristic is the two-microphone, impedance-tube method. Modifications to the processing of the sampled acoustic field have been proposed to allow for more general test geometries. While analytical methods may be applied to a small class of ideal geometries, numerical methods provide greater geometric flexibility. In general, solutions to the wave equation forward problem are found from boundary element, finite element, or finite difference methods. The inverse problem of parameter estimation is solved by evaluating accuracy of prediction of the acoustic field for given distributions of the specific acoustic impedance parameter against observed data. In this presentation a Bayesian-network sampling approach is used to estimate specific acoustic impedance of a micro-perforated panel in an impedance tube test geometry. The choice of geometry and material allow for direct comparison to the two-microphone, impedance-tube method within the appropriate frequency range, and a theoretical model for the material beyond that frequency range. The potential to extend the frequency range of operation of the impedance tube is explored. Sensitivity of the method to nuisance parameters is discussed.

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Multiple-slope sound energy decay investigations in single space enclosures with specific geometrical and material attributes

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The Journal of the Acoustical Society of America 2013年第5_SUPPLEMENT期134卷 3985-3985页

作者： Zühre Sü Gül Ning Xiang Mehmet Caliskan Architecture R&D Middle East Tech. Univ. MEZZO Studyo LTD METU Technopolis KOSGEB-TEKMER No112 ODTU Cankaya Ankara 06800 Turkey zuhre@*** Graduate Program in Architectural Acoust. School of Architecture Rensselaer Polytechnic Inst. Troy NY Mech. Eng. Middle East Tech. Univ. Ankara Turkey

Acoustical coupling until now has basically been studied to define the peculiar sound field within acoustically coupled enclosures in which multiple-slope energy decays can often be observed. The key concern of this study is to reveal the potential of multiple-slope energy decay formation in over-size single space structures with particular geometry and distribution of materials in different acoustical performance characteristics. Specifically, multiple dome superstructures, composed of one central dome supported by semi-domes and transitional elements, are selected for the case studies. The interpretation of the acquired data is carried in order to broaden the definition of “the coupled volume system” with an emphasis on invisible sources and apertures of acoustical coupling in a “single volume system.” The methodology of the research involves joint use of in-situ acoustical measurements, acoustical modeling/simulation methods, and computational analyses. Bayesian analysis approach is applied in quantifying multiple-slope decay parameters. Initial results for selected cases indicate double and triple slopes for field tests and even more slope natures for simulations at various frequency bands. Future work aims to elaborate the mechanism of multiple-slope decay occurrence by energy feedback and distribution analysis.

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Design Elements and Users’ Perceptual Response: A Case of Window Display Design for Adolescent Merchandising

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Procedia - Social and Behavioral Sciences 2012年 50卷 685-690页

作者： Kanokwan Somoon Nopadon Sahachaisaree Graduate Program in Multidisciplinary Design Research Graduate Faculty of Architecture King Mongkut's Institute of Technology Ladkrabang Chalongkrung Road Ladkrabang Bangkok 10520 Thailand Multidisciplinary Design Research King Mongkut's Institute of Technology Ladkrabang Chalongkrung Road Ladkrabang Bangkok 10520 Thailand

Window displays, as a part of selling strategies, not only convey the type and positioning of mechanize, but also the promotional strategies and corporate images. The study uses window displays for clothing to examine patterns, selling strategies, merchandize types, and target groups. It investigates the effects of design elements on the customers perceptual responding to configurations. The theoretical framework bases on marketing concepts, visual perception principles, Gestalt psychology, and design's principle and elements. Research found that 14 factors in the design affected to perception. The study perception indicates that purchasing desire and attraction had more relation.

关键词： Window displays clothing display design guideline Versaul Merchanding selling strategies

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Modeling binaural suppression processes for predicting speech intelligibility in enclosed spaces

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The Journal of the Acoustical Society of America 2012年第3_SUPPLEMENT期132卷 1911-1911页

作者： Vanessa Li Ning Xiang Jonas Braasch Graduate Program in Architectural Acoustics School of Architecture Rensselaer Polytechnic Institute Troy NY 12180vanessa.li@*** Graduate Program in Architectural Acoustics School of Architecture Rensselaer Polytechnic Institute Troy NY

Speech from a target speaker reaches a listener via multiple paths in a room due to room reflections. As sound waves from the target speaker approach the listener, degradation to the signal is caused by ambient noise and reverberant energy. The speech transmission index (STI) is a commonly used metric for predicting speech intelligibility accounting for both noise and reverberation. This metric, however, is a monophonic measure that does not take into consideration binaural cues used for unmasking undesired effects. As a result, using the STI on its own tends to under-predict intelligibility under binaural listening conditions. The proposed research aims to improve speech intelligibility predictions with the presence of room effects by implementing a psychophysical binaural model as a front-end to the STI calculation. The equalization-cancellation (EC) theory is applied to spatially unmask noise, while late incoherent reverberant energy is suppressed by applying a weighting function based on interaural coherence. Preliminary comparisons between listening tests and model predictions reveal promising results, indicating a useful tool in acoustical planning in addition to further study into binaural suppression processes.

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A Study on preference of interface design techniques for web survey

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International Journal of Computer Science Issues 2012年第5 5-1期9卷 10-17页

作者： Srinilta, Wisitmon Anuntavoranich, Pongpun Malisuwan, Settapong Taraphokakul, Suppawan Technopreneurship and Innovation Management Program Graduate School Chulalongkorn University Bangkok 10330 Thailand Faculty of Architecture Chulalongkorn University Bangkok 10330 Thailand Office of The National Broadcasting and Telecommunications Commission Bangkok 10400 Thailand Faculty of Commerce and Management Mahidol University Kanchanaburi 71150 Thailand

According to the advancement in internet and web-based application, the survey via the internet has been increasingly utilized due to its convenience and time saving. This article studied the influence of five web-design techniques - screen design, response format, logo type, progress indicator, and image display on the interest of the respondents. Two screen display designs from each design technique were made for selection. Focus group discussion technique was conducted on the four groups of Y generation participants with different characteristics. Open discussion was performed to identify additional design factors that will affect the interest of the questionnaire. The study found the degree of influence of all related design factors can be ranked from screen design, response format, font type, logo type, background color, progress indicator, and image display respectively. © 2012 International Journal of Computer Science Issues.

关键词： Surveys

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Rigid-frame porous material physical parameter estimation with Bayesian analysis

Rigid-frame porous material physical parameter estimation wi...

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40th International Congress and Exposition on Noise Control Engineering 2011, INTER-NOISE 2011

作者： Fackler, Cameron Xiang, Ning Graduate Program in Architectural Acoustics Rensselaer Polytechnic Institute School of Architecture Troy NY United States

ISBN: (纸本)9781618392800

A method to estimate the physical parameters of rigid-frame porous materials through measurement of the acoustic impedance of such materials is presented. Porous materials are widely used as sound absorbers in many industries. Modeling the effects of porous absorbers and making optimal use of porous absorbent materials requires knowledge of the physical parameters characterizing such materials: porosity, tortuosity, and flow resistivity. For many materials, direct measurement of these parameters requires time-consuming or highly sensitive procedures. Based on some existing models for the characteristic impedance of a porous material in terms of the physical material parameters, Bayesian parameter estimation is used to estimate the physical parameters of a material from a measurement of its complex acoustic impedance. In addition to estimation of the values of the physical parameters, Bayesian analysis generates information on the uncertainties and interdependence of the parameters. The results obtained are compared to published data for several rigid-frame porous materials. Copyright © (2011) by the Institute of Noise Control Engineering.

关键词： Porous materials

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The effect of head movement on perceived listener envelopment and apparent source width

The effect of head movement on perceived listener envelopmen...

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131st Audio Engineering Society Convention 2011

作者： Parks, Anthony Braasch, Jonas Graduate Program in Architectural Acoustics School of Architecture Rensselaer Polytechnic Institute Troy NY 12180 United States

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.

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Low frequency absorption and attenuation of granular aerogel composites

Low frequency absorption and attenuation of granular aerogel...

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40th International Congress and Exposition on Noise Control Engineering 2011, INTER-NOISE 2011

作者： Azevedo, Matthew Xiang, Ning Fackler, Cameron Graduate Program in Architectural Acoustics School of Architecture Rensselaer Polytechnic Institute Troy NY 12180 United States

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.

关键词： Aerogels

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A binaural model for predicting speech intelligibility in rooms using noise and reverberation suppression processes

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The Journal of the Acoustical Society of America 2012年第4_SUPPLEMENT期131卷 3317-3317页

作者： Vanessa Li Ning Xiang Jonas Braasch Graduate Program in Architectural Acoustics School of Architecture Rensselaer Polytechnic Institute Troy New York vanessa.li@***

Conventional metrics for predicting speech intelligibility are commonly described using the speech intelligibility index (SII) and speech transmission index (STI)--both of which are calculated using a monophonic signal. Under binaural conditions, these predictors often underestimate intelligibility due to the fact that beneficial binaural cues for unmasking detrimental effects are not accounted for. Beutelmann et al. [J. Acoust. Soc. Am. 127, 2479-2497 (2010)] proposed a binaural speech intelligibility model that determines the SII after suppressing spatially-separate noise using the equalization-cancellation (EC) process. This research expands on previous work by extending the model to analyze auditory scenes with more complex room acoustics, namely reverberation. In order to account for speech intelligibility degradation in the presence of room effects, the SII calculation is replaced by the STI. The current work also incorporates binaural release from reverberation by introducing an additional reverberation suppression mechanism into the model based on interaural coherence. The use of speech intelligibility metrics as an objective form of measurement may be used as a means to further understand binaural suppression processes within various room acoustic configurations through subjective listening tests.

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