Дисертації з теми "Adaptive acoustics"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Adaptive acoustics".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Dessalermos, Spyridon. "Undersea acoustic propagation channel estimation." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Jun%5FDessalermos.pdf.
Повний текст джерелаThesis Advisor(s): Joseph Rice, Roberto Cristi. Includes bibliographical references (p. 117-119). Also available online.
Hermand, Jean-Pierre. "Environmentally-Adaptive Signal Processing in Ocean Acoustics." Doctoral thesis, Universite Libre de Bruxelles, 1993. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/212734.
Повний текст джерелаCreasy, Miles Austin. "Adaptive Collocated Feedback for Noise Absorption in Acoustic Enclosures." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/45209.
Повний текст джерелаMaster of Science
Srinivas, Vivek. "Adaptive, Wave Guiding Acoustic Arrays using Circularly Symmetric Reconfigurable Structures." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587130205893861.
Повний текст джерелаFuller, Ryan Michael. "Adaptive Noise Reduction Techniques for Airborne Acoustic Sensors." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1355361066.
Повний текст джерелаFreij, G. J. "Enhanced sequential adaptive linear prediction for speech encoding." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356268.
Повний текст джерелаWong, Lawrence Yik-Lung. "Adaptive system modelling for active attenuation of sound." Thesis, Open University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316967.
Повний текст джерелаAl-Kindi, Manal Jamil. "Implementation of adaptive noise cancellation in the diving environment." Thesis, University of Strathclyde, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304949.
Повний текст джерелаGillespie, Andrew Fleming Ralph. "The application of adaptive transversal filtering to active noise control." Thesis, London South Bank University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316973.
Повний текст джерелаJohn, Ranjit Yohannan. "Adaptive filtering and the identification of tones in broadband noise." Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315347.
Повний текст джерелаHigley, William J. "Self-adaptive processes for the mitigation of coherent multipath in ocean acoustics." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3259053.
Повний текст джерелаTitle from first page of PDF file (viewed June 21, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.
Round, David Peter. "Application of DSP methods to sound reproduction." Thesis, Bangor University, 1996. https://research.bangor.ac.uk/portal/en/theses/application-of-dsp-methods-to-sound-reproduction(89e56009-ab09-4054-9a6b-e5181507a3f4).html.
Повний текст джерелаCourtis, N. J. "Some aspects of speech intelligibility enhancement with particular regard to adaptive filtering and room acoustics." Thesis, University of Hertfordshire, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356313.
Повний текст джерелаDrumm, Ian. "The development and application of an adaptive beam tracing algorithm to predict the acoustics of auditoria." Thesis, University of Salford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244883.
Повний текст джерелаFung, Chi Fung. "On-line dynamical system modelling using radial basis function networks in adaptive non-linear noise cancellation." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389790.
Повний текст джерелаLewis, Matthew Robert S. M. Massachusetts Institute of Technology. "Evaluation of vector sensors for adaptive equalization in underwater acoustic communication." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/93793.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 123-125).
Underwater acoustic communication is an extremely complex field that faces many challenges due to the time-varying nature of the ocean environment. Vector sensors are a proven technology that when utilizing their directional sensing capabilities allows us to minimize the effect of interfering noise sources. A traditional pressure sensor array has been the standard for years but suffers at degraded signal to noise ratios (SNR) and requires maneuvers or a lengthly array aperture to direction find. This thesis explores the effect of utilizing a vector sensor array to steer to the direction of signal arrival and the effect it has on equalization of the signal at degraded SNRs. It was demonstrated that utilizing a single vector sensor we were able steer to the direction of arrival and improve the ability of an equalizer to determine the transmitted signal. This improvement was most prominent when the SNR was degraded to levels of 0 and 10 dB where the performance of the vector sensor outperformed that of the pressure sensor in nearly 100% of cases. Finally, this performance improvement occurred with a savings in computational expense.
by Matthew Robert Lewis.
S.M.
Yellepeddi, Atulya. "Direct-form adaptive equalization for underwater acoustic communication." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1912/5281.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 139-143).
Adaptive equalization is an important aspect of communication systems in various environments. It is particularly important in underwater acoustic communication systems, as the channel has a long delay spread and is subject to the effects of time- varying multipath fading and Doppler spreading. The design of the adaptation algorithm has a profound influence on the performance of the system. In this thesis, we explore this aspect of the system. The emphasis of the work presented is on applying concepts from inference and decision theory and information theory to provide an approach to deriving and analyzing adaptation algorithms. Limited work has been done so far on rigorously devising adaptation algorithms to suit a particular situation, and the aim of this thesis is to concretize such efforts and possibly to provide a mathematical basis for expanding it to other applications. We derive an algorithm for the adaptation of the coefficients of an equalizer when the receiver has limited or no information about the transmitted symbols, which we term the Soft-Decision Directed Recursive Least Squares algorithm. We will demonstrate connections between the Expectation-Maximization (EM) algorithm and the Recursive Least Squares algorithm, and show how to derive a computationally efficient, purely recursive algorithm from the optimal EM algorithm. Then, we use our understanding of Markov processes to analyze the performance of the RLS algorithm in hard-decision directed mode, as well as of the Soft-Decision Directed RLS algorithm. We demonstrate scenarios in which the adaptation procedures fail catastrophically, and discuss why this happens. The lessons from the analysis guide us on the choice of models for the adaptation procedure. We then demonstrate how to use the algorithm derived in a practical system for underwater communication using turbo equalization. As the algorithm naturally incorporates soft information into the adaptation process, it becomes easy to fit it into a turbo equalization framework. We thus provide an instance of how to use the information of a turbo equalizer in an adaptation procedure, which has not been very well explored in the past. Experimental data is used to prove the value of the algorithm in a practical context.
by Atulya Yellepeddi.
S.M.
Offermans, Nicolas. "Towards adaptive mesh refinement in Nek5000." Licentiate thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217501.
Повний текст джерелаQC 20171114
Shi, Kun. "Nonlinear acoustic echo cancellation." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26704.
Повний текст джерелаCommittee Chair: G. Tong Zhou; Committee Co-Chair: Xiaoli Ma; Committee Member: David V. Anderson; Committee Member: James Stevenson Kenney; Committee Member: Liang Peng; Committee Member: William D. Hunt. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Schlicher, Jeremy T. "A Multi-Genre Adaptive Performance Hall." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1148489621.
Повний текст джерелаКасянчик, Юрій Олександрович. "Мультифункціональний зал з адаптивною акустикою". Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/30467.
Повний текст джерелаThe thesis contains the main part of 75 sheets, 63 illustrations. The purpose of the work is to analyze the existing literature, assimilate theoretical knowledge and implement it on a projected example. Namely, the system of adaptive acoustics in combination with the Wave Field Synthesis (WFS) in the multifunctional room. The main function of which is the playback of various programs, from speech and music to Dolby sound. After selecting all of the input data, the size of the premises and the choice of the speaker system, the analysis was performed in the Matlab software package using simulated graphs and arrays. Throughout the work, all the conclusions are drawn.
Videla, Marió Javier Andrés. "Spline-based methods with adaptive refinement for problems of acoustics and fracture mechanics of thin plates." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/170004.
Повний текст джерелаBoth the CAD software and FEM software have a significant impact on engineering nowadays. Even though both are powerful tools for design and analysis, the main drawback is that CAD geometries and Finite Element models do not entirely match, which results in the necessity to re-parameterize the geometry many times during the solution cycle in FEM. Isogeometric Analysis (IGA) was proposed to fulfill this gap and create the direct link between the CAD design and FEM analysis. The main idea of IGA is to substitute the shape functions used in FEM by the shape functions used in the CAD software. In particular, one of the main drawbacks of NURBS basis functions, and therefore of IGA, is the lack of local refinement, which makes them computationally highly expensive in applications that demands a non-uniform refinement of the geometry. Polynomial splines over Hierarchical T-meshes (PHT-splines) were introduced by Deng et al. as a type of spline that allows local refinement and adaptability by means of a polynomial basis capable of parameterizing the geometry. In this work, we demonstrate the application of PHT-splines for two type of problems: time-harmonic acoustic problems, modeled by the Helmholtz equation, and fracture mechanics of thin plate problems, modeled by the Kirchhoff-Love theory. Solutions of the Helmholtz equation have two features: global oscillations associated with the wave number and local gradients caused by geometrical irregularities. The results show that after a sufficient number of degrees of freedom is used to approximate global oscillations, adaptive refinement can capture local features of the solution. The residual-based and recovery-based error estimators are compared and the performance of $p$-refinement is investigated. Moreover, an eXtended Geometry Independent Field approximaTion (XGIFT) formulation based on Polynomials Splines Over Hierarchical T-meshes (PHT-splines) for modeling both static and dynamic fracture mechanic problems for plates described by the Kirchhoff-Love theory is presented. Adaptive refinement is employed using a recovery-based error estimator. Results show that adaptive refinement can capture local features of the solution around the crack tip, improving results in both static and dynamic examples. In both cases, the simulations are done in the context of recently introduced Geometry Independent Field approximaTion (GIFT), where PHT-splines are only used to approximate the solution, while the computational domain is parameterized with NURBS. This approach builds on the natural adaptation ability of PHT-splines and avoids the re-parameterization of the NURBS geometry during the solution refinement process.
Puikkonen, Panu Tapani. "Development of an Adaptive Equalization Algorithm Using Acoustic Energy Density." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1686.
Повний текст джерелаKamaldar, Mohammadreza. "DISCRETE-TIME ADAPTIVE CONTROL ALGORITHMS FOR REJECTION OF SINUSOIDAL DISTURBANCES." UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/129.
Повний текст джерелаNadakuditi, Rajesh Rao. "A channel subspace post-filtering approach to adaptive equalization." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/87613.
Повний текст джерелаIncludes bibliographical references (p. 151-154).
by Rajesh Rao Naduditi.
S.M.
Anderson, Michael-John Peter. "The amalgamation of acoustic and digital audio techniques for the creation of adaptable sound output for musical theatre." Diss., University of Pretoria, 2019. http://hdl.handle.net/2263/76720.
Повний текст джерелаDissertation (MMus)--University of Pretoria, 2019.
Music
MMus
Unrestricted
Nunes, Ronaldo Fernandes. "Um estudo do controle ativo de ruidos em dutos usando o algoritmo do minimo erro medio quadratico com referencia filtrada." [s.n.], 1999. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263223.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-07-25T19:56:09Z (GMT). No. of bitstreams: 1 Nunes_RonaldoFernandes_M.pdf: 5604429 bytes, checksum: 3e2d42b8a7421a42a727f76195057b6e (MD5) Previous issue date: 1999
Resumo: Neste trabalho foi estudado o controle ativo de ruído em dutos usando técnicas de filtragem adaptativa. Foi utilizado o método de controle adaptativo do Mínimo Erro Médio Quadrático (Least Mean Square - LMS) normalizado com sinal de referência filtrado, NFXLMS. Três geometrias de dutos montados em uma bancada experimental para os casos de controle monocanal, multierro e multiexcitação foram verificados. Os sinais de perturbação investigados foram: tonal (seno), aleatório e uma com composição de duas senoidais no caso multiexcitação. Avaliações das impedâncias analíticas e experimentais foram verificadas no estudo de uma configuração do duto para o caso de controle monocanal. Simulações e experimentos foram realizados para diversas geometrias de dutos e diferentes tipos de excitação. Parâmetros do algoritmo, como o número de pesos do filtro adaptativo, faixa de frequência de perturbação, fator de convergência do algoritmo e freqüência de amostragem foram investigados nos casos tratados. Os resultados encontrados nos experimentos realizados para o controlador monocanal e multierro confirmaram as avaliações efetuadas nas simulações. Para o caso multiexcitação, limitações da placa de processamento de sinal não permitiram a obtenção de resultados conclusivos
Abstract: In this work was investigated the active control of noise in ducts using the techniques of adaptive filtering. The normalized, filtered reference Least Mean Square algorithm control method - NXLMS was used. Three shapes of duct system in a supported experimental test rig for the cases of control mono-channel, multi-error, and multi-input were verified. The investigated disturbance signals were: tonal (sine), random, and a composition of two sinusoids for the case of multi-input. Evaluations of analytical and experimental impedances were verified in a configuration study of mono-channel duct contraI case. Simulations and experiments were accomplished for several duct shapes and different types of excitations. AIgorithm parameters, such as the weight number of adaptive filter, the disturbance frequency range, the convergence factor of the algorithm, and the sampling frequency were investigated in the treated cases. The experimental results obtained for the mono-channel and multi-error controller confirm the evaluations obtained in the simulations. For the multi-input case, limitations of the DSP board didn't allow to obtain conclusive results
Mestrado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica
Downs, Matthew C. "Adaptive Control Applied to the Cal Poly Spacecraft Attitude Dynamics Simulator." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/231.
Повний текст джерелаSun, Guohua. "Active Control of Impact Acoustic Noise." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1413542213.
Повний текст джерелаBapat, Milind S. "New Developments in Fast Boundary Element Method." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1331296947.
Повний текст джерелаPolston, James D. "DECENTRALIZED ADAPTIVE CONTROL FOR UNCERTAIN LINEAR SYSTEMS: TECHNIQUES WITH LOCAL FULL-STATE FEEDBACK OR LOCAL RELATIVE-DEGREE-ONE OUTPUT FEEDBACK." UKnowledge, 2013. http://uknowledge.uky.edu/me_etds/24.
Повний текст джерелаRose, John Frederick William. "Visually adaptive virtual acoustic imaging." Thesis, University of Southampton, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399992.
Повний текст джерелаCheung, Mei Yi S. M. Massachusetts Institute of Technology. "Autonomous adaptive acoustic relay positioning." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/85504.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 75-79).
We consider the problem of maximizing underwater acoustic data transmission by adaptively positioning an autonomous mobile relay so as to learn and exploit spatial variations in channel performance. The acoustic channel is the main practical method of underwater wireless communication and improving channel throughput and reliability is key to improving the capabilities of underwater vehicles. Predicting the performance of the acoustic channel in the shallow-water environment is challenging and usually requires extensive modeling of the environment. However, a mobile relay can learn about the unknown channel as it transmits. The relay must balance searching unknown sites to gain more information, which may pay off in the future, and exploiting already-visited sites for immediate reward. This is a classic exploration vs. exploitation problem that is well-described by a multi-armed bandit formulation with an elegant solution in the form of Gittins indices. For an autonomous ocean vehicle traveling between distant waypoints, however, switching costs are significant. The multi-armed bandit with switching costs has no optimal index policy, so we have developed an adaptation of the Gittins index rule with limited policy enumeration and asymptotic performance bounds. We describe extensive shallow-water field experiments conducted in the Charles River (Boston, MA) with autonomous surface vehicles and acoustic modems, and use the field data to assess performance of the MAB decision policies and comparable heuristics. We find the switching-costs-aware algorithm offers superior real-time performance in decision-making and efficient learning of the unknown field.
by Mei Yi Cheung.
S.M.
Vuksanovic, Branislav. "Electronically controlled acoustic shadows." Thesis, University of Huddersfield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285586.
Повний текст джерелаWage, Kathleen E. "Adaptive estimation of acoustic normal modes." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12096.
Повний текст джерелаHuo, Jiaquan. "Subband acoustic echo cancellation." Curtin University of Technology, Australian Telecommunications Research Institute, 2004. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=15802.
Повний текст джерелаBy independently adapting the scale estimates and normalizing the adaptation in each subband, significant improvement in terms of the convergence and tracking speed over the time domain robust NLMS algorithm can be obtained without sacrificing the double talk robustness. Moreover, it is demonstrated that by using different thresholds in the update of the echo cancellation filter and the scales, the robust algorithms converge and track echo path variation as fast as their non-robust counter part while still maintaining a sufficiently low sensitivity to double talk detection errors. The application of two path adaptive filters to acoustic echo cancellation is examined. An analysis of the original two path adaptive filtering algorithm shows that it suffers from two kinds of performance degradation due to the divergence of the background filter during double talk, namely the slow tracking of echo path variation and the false filter coefficient copying after double talk. A robust two path adaptive filter is proposed to mitigate these problems.
Fee, D. T. "Dereverberation of acoustic signals via adaptive filtering." Thesis, Queen's University Belfast, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438629.
Повний текст джерелаChen, Wu-Nan. "Multiple microphone voice activity detection and adaptive noise cancellation." Thesis, University of the West of Scotland, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365083.
Повний текст джерелаHerbordt, Wolfgang. "Combination of robust adaptive beamforming with acoustic echo cancellation for acoustic human-machine interfaces." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972527907.
Повний текст джерелаBirkett, A. Neil. "Nonlinear adaptive filtering with application to acoustic echo cancellation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ26845.pdf.
Повний текст джерелаAlvarez-Tinoco, Antonio Mario. "Adaptive algorithms for the active attenuation of acoustic noise." Thesis, Heriot-Watt University, 1985. http://hdl.handle.net/10399/1607.
Повний текст джерелаLyness, A. D. "Adaptive compensation for acoustic impairments using multichannel surround sound." Thesis, Queen's University Belfast, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411128.
Повний текст джерелаBirkett, A. Neil (Alexander Neil) Carleton University Dissertation Engineering Systems and Computer. "Nonlinear adaptive filtering with application to acoustic echo cancellation." Ottawa, 1997.
Знайти повний текст джерелаChen, Teyan. "Novel adaptive signal processing techniques for underwater acoustic communications." Thesis, University of York, 2011. http://etheses.whiterose.ac.uk/1925/.
Повний текст джерелаFinefield, John K. "Investigation of combined feedback and adaptive control of cylinder vibrations." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-10062009-020152/.
Повний текст джерелаMoat, Trevor P. B. M. "Orthogonal adaptive digital filters with applications to acoustic system identification." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0025/MQ27022.pdf.
Повний текст джерелаPuikkonen, Panu. "Development of an adaptive equalization algorithm using acoustic energy density /." Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd2899.pdf.
Повний текст джерелаMulholland, P. J. "Adaptive filters and their application to an adaptive receiving array for an underwater acoustic data link." Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234508.
Повний текст джерелаPushparajah, Sudarini Jayani. "Frequency domain adaptive algorithms for acoustic echo cancellation during double talk." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392886.
Повний текст джерелаHart, Joanna Elizabeth. "Multirate sub-band structures with application to adaptive acoustic echo cancellation." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300759.
Повний текст джерела