Dissertations / Theses on the topic 'High frequency sound'
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Joseph, P. F. "Active control of high frequency enclosed sound fields." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280927.
Full textTorres, Juan C. "Modeling of high-frequency acoustic propagation in shallow water." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Jun%5FTorres.pdf.
Full textRouse, Jerry Wayne. "Energy-Based Boundary Element Method for High-Frequency Broadband Sound Fields in Enclosures." NCSU, 2000. http://www.lib.ncsu.edu/theses/available/etd-20000911-161316.
Full textThis work sets forth a new method for predicting the spatialvariation of mean square pressure within two-dimensionalenclosures containing high-frequency broadband sound fieldsand light to moderate absorption. In the new method, theenclosure boundaries are replaced by a continuousdistribution of broadband uncorrelated sources, each ofwhich provides a constituent field expressed in terms ofmean square pressure and time average intensity variables.Superposition of these fields leads to the overall meansquare pressure and time average intensity as a function ofposition. Boundary conditions for radiating and absorbingsurfaces are recast in terms of energy and intensityvariables. The approach is implemented as a boundaryelement formulation for efficient evaluation of the pressureand intensity fields in enclosures. In contrast totraditional boundary element methods, the new method isindependent of frequency. A two-dimensional model problemenclosure is investigated to verify the new method. The exact analytical solution for the mean square pressuredistribution within the model problem enclosure is obtainedand compared to the results predicted by the new method.The comparisons indicate that the new method is asignificant improvement upon classical diffuse field theoryand computationally efficient relative to traditional boundary element methods and ray tracing techniques.
Davis, Darren D. "Characterization of the MEMS directional sound sensor in the high frequency (15 - 20 kHz) range." Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/10588.
Full textSun, Chao. "Acoustic characterisation of ultrasound contrast agents at high frequency." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8093.
Full textMORE, SHASHIKANT R. "EXPERIMENTAL CHARACTERIZATION AND ACTIVE CONTROL SIMULATION OF THE ACOUSTIC NOISE RESPONSE OF A HIGH-FIELD, HIGH RATE MRI SCANNER." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100536748.
Full textPosner, H. Ingmar. "A composite linear aperture model of the high-frequency sound scattering profile of schools of farmed fish." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427758.
Full textBrewin, Mark Paul. "Carotid atherosclerotic plaque characterisation by measurement of ultrasound sound speed in vitro at high frequency, 20 MHz." Thesis, Queen Mary, University of London, 2010. http://qmro.qmul.ac.uk/xmlui/handle/123456789/699.
Full textGriffin, S. J. "Sensitivity to interaural timing differences within high-frequency sounds." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1445561/.
Full textKubálek, Jiří. "Vysokofrekvenční pulsace při provozu vodní turbíny." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-234198.
Full textNachiketha, Sharma Ramamurthy. "Vocal repertoire and disturbance-associated vocalisations in free-ranging Asian elephants." Kyoto University, 2020. http://hdl.handle.net/2433/253134.
Full textKyoto University (京都大学)
0048
新制・課程博士
博士(理学)
甲第22298号
理博第4612号
新制||理||1661(附属図書館)
京都大学大学院理学研究科生物科学専攻
(主査)教授 幸島 司郎, 教授 平田 聡, 教授 伊谷 原一
学位規則第4条第1項該当
Patris, Julie. "Contributions en méthodes pour le suivi de mysticètes par acoustique passive." Electronic Thesis or Diss., Toulon, 2019. http://www.theses.fr/2019TOUL0016.
Full textPassive acoustic monitoring has a growing importance in marine mammals studies. This work is concerned with the largest of marine mammals, the blue whale (Balaenoptera musculus). We obtained a new corpus of acoustic data in the northern part of Chile, in the Humboldt archipelago. We show the presence of a song characteristic of the 'Chilean' blue whale, formerly described in southern Chile and Galapagos islands. Based on this sang type, we propose new methods of analysing and classifying pulsed sounds. Using the fundamental frequency thus obtained, we analyse the blue whale's sang, showing a general evolution of the frequency on a decadal scale. We also construct a method of monohydrophone source localisation based on high performance simulation of the acoustic wave field, by spectral elements methods. We conclude emphasizing on the importance of bioacoustic for monitoring the marine world
Muševič, Sašo. "Non-stationary sinusoidal analysis." Doctoral thesis, Universitat Pompeu Fabra, 2013. http://hdl.handle.net/10803/123809.
Full textMany types of everyday signals fall into the non-stationary sinusoids category. A large family of such signals represent audio, including acoustic/electronic, pitched/transient instrument sounds, human speech/singing voice, and a mixture of all: music. Analysis of such signals has been in the focus of the research community for decades. The main reason for such intense focus is the wide applicability of the research achievements to medical, financial and optical applications, as well as radar/sonar signal processing and system analysis. Accurate estimation of sinusoidal parameters is one of the most common digital signal processing tasks and thus represents an indispensable building block of a wide variety of applications. Classic time-frequency transformations are appropriate only for signals with slowly varying amplitude and frequency content - an assumption often violated in practice. In such cases, reduced readability and the presence of artefacts represent a significant problem. Time and frequency resolu
Cheng, chieh-yuan, and 鄭傑元. "The Prediction of Structure-Borne Sound at High Frequency Range." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/87268931983163827165.
Full textAyub, Md. "Experimental and numerical investigation of a carbon nanotube acoustic absorber." Thesis, 2016. http://hdl.handle.net/2440/112038.
Full textThesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2016.