Rozprawy doktorskie na temat „Acoustics- Signal processing”
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Walden, Alan Keith. "Signal processing techniques on an underwater acoustic projector". Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/17336.
Pełny tekst źródłaHermand, 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.
Pełny tekst źródłaManning, George Keith. "Signal processing for ultrasonic foetal monitoring". Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/12559.
Pełny tekst źródłaKeenan, Desmond Barry. "Enhanced signal processing of pulsed doppler ultrasound". Thesis, University of Ulster, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342411.
Pełny tekst źródłaRex, James Alexander. "Microphone signal processing for speech recognition in cars". Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326728.
Pełny tekst źródłaOrduna-Bustamante, Felipe. "Digital signal processing for multi-channel sound reproduction". Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261565.
Pełny tekst źródłaDessalermos, 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.
Pełny tekst źródłaThesis Advisor(s): Joseph Rice, Roberto Cristi. Includes bibliographical references (p. 117-119). Also available online.
Novaes, Marcos (Marcos Nogueira). "Multiresolution Signal Cross-correlation". Thesis, University of North Texas, 1994. https://digital.library.unt.edu/ark:/67531/metadc277645/.
Pełny tekst źródłaMurphy, 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.
Pełny tekst źródłaChen, Zhenxiang. "The applications of ultrasonic imaging and signal processing in two-phase flow measurement". Thesis, Cranfield University, 1996. http://dspace.lib.cranfield.ac.uk/handle/1826/10516.
Pełny tekst źródłaPierce, Robert S. "Signal enhancement of laser generated ultrasound for non-destructive testing". Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/18395.
Pełny tekst źródłaKirchmann, Carl Christian. "Automatic acoustic tests of conference phones". Thesis, Uppsala universitet, Fasta tillståndets elektronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326253.
Pełny tekst źródłaZelnio, Anne M. "Detection of Small Aircraft using an Acoustic Array". Wright State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1247075795.
Pełny tekst źródłaWu, Tsan-Ming. "Statistical impulse reponse modeling and dereverberation for room acoustics". Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/14932.
Pełny tekst źródłaBienvenu, Kirk Jr. "Underwater Acoustic Signal Analysis Toolkit". ScholarWorks@UNO, 2017. https://scholarworks.uno.edu/td/2398.
Pełny tekst źródłaSarikaya, Tevfik Bahadir. "A Comparative Analysis Of Matched Field Processors For Underwater Acoustic Source Localization". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612578/index.pdf.
Pełny tekst źródłas coherent matched field processor and broadband matched field processor with environmental perturbation constraints is given for certain environmental conditions. Finally, a new weighting approach to combine data for broadband matched field processing is introduced. The fact that information from different frequencies may have different reliability depending on the environmental conditions is considered to develop a weighting scheme. It is shown that a performance gain compared to existing processors can be achieved by using the weighting scheme introduced in this study.
Boyle, John K. "Performance Metrics for Depth-based Signal Separation Using Deep Vertical Line Arrays". PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2198.
Pełny tekst źródłaRiley, H. Bryan. "Matched-field source detection and localization in high noise environments a novel reduced-rank signal processing approach". Ohio : Ohio University, 1994. http://www.ohiolink.edu/etd/view.cgi?ohiou1173982711.
Pełny tekst źródłaBaker, David L. "Development of a Rotordynamic Signal Processing MATLAB Interface and a Two-Disk Rotor Model". DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1794.
Pełny tekst źródłaEfraimsson, Nils. "Onset detection in polyphonic music". Thesis, KTH, Tal, musik och hörsel, TMH, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-210417.
Pełny tekst źródłaAnsatsdetektion används inom musikanalys för bland annat automatisk transkription och ljudkomprimering. Ansatsdetektion innebär att lokalisera en händelse i en musiksignal. Med målet att utveckla en algoritm som presterar bättre än aktuella2 algoritmer ges här en genomgång av några nödvändiga teoretiska kunskaper i ämnet, bland annat korttids-Fouriertransformen (STFT) och hur fönsterfunktioner påverkar signalbehandling. Tidigare arbeten inom ansatsdetektion med olika infallsvinklar studeras och en möjlig förbättring av en av dem, den av Bello, Duxbury, Davies, & Sandler (2004), framträder. Algoritmen använder sig av STFT och analyserar ljudsignaler en tidsenhet i taget. Utifrån varje analyserad tidsenhet görs en extrapolation till nästa tidsenhet genom antagandet att signalen är konstant. Skillnaden mellan den extrapolerade tidsenheten och den faktiska tidsenheten i STFTn utgör detektionsfunktionen. Den möjliga förbättringen består i att använda idéer från olika algoritmer för ansatsdetektion – ljudsignalen analyseras i olika frekvensband med bandberoende inställningar för STFTn – och en förändrad extrapoleringsfunktion. Den föreslagna algoritmen jämförs med originalet av Bello, Duxbury, Davies, & Sandler (2004) och även med en variant utvecklad av Dixon (2006) genom att applicera dem på 20 spår med tre olika fönsterfunktioner. Resultaten utvärderas enligt MIREX (2005-2016) standarder och är lovande för algoritmen, då den har en bra träffbild, men både träffsäkerhet och F-värde ligger under de båda andra. Ett flertal möjliga förbättringar av algoritmen iakttas och presenteras.
Warneke, Andrew Travis. "An evaluation of the efficacy of digital real-time noise control techniques in evoking the musical effect". Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1020158.
Pełny tekst źródłaGhaffari, Ghazaleh. "Estimation of Stapedius-Muscle Activation using Ear Canal Absorbance Measurements : An Application of Signal Processing in Physiological Acoustics". Thesis, Linköpings universitet, Institutionen för medicinsk teknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-98992.
Pełny tekst źródłaJeon, Woojay. "Pitch detection of polyphonic music using constrained optimization". Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/15802.
Pełny tekst źródłaKosek, Paul C. "Improved analysis of musical sounds using time-frequency distributions". Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=83189.
Pełny tekst źródłaPérez, López Andrés. "Parametric analysis of ambisonic audio: a contributions to methods, applications and data generation". Doctoral thesis, Universitat Pompeu Fabra, 2020. http://hdl.handle.net/10803/669962.
Pełny tekst źródłaChhabra, Manish. "Source Characterization using an Experimental Method and Prediction of Insertion of the Exhaust System". University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin154399673454236.
Pełny tekst źródłaAguda, Britt. "Three dimensional passive localization for single path arrival with unknown starting conditions". ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2513.
Pełny tekst źródłaStylemans, Eric. "Etude d'un système de contre-mesure électroacoustique anti sous-marin destiné à la protection des navires". Valenciennes, 1997. http://www.theses.fr/1997VALE0007.
Pełny tekst źródłaRouyer, Julien. "Tomographie ultrasonore dédiée à l'imagerie du sein - Validation expérimentale du projet ANAÏS". Phd thesis, Université de Provence - Aix-Marseille I, 2012. http://tel.archives-ouvertes.fr/tel-00733152.
Pełny tekst źródłaRen, Qunyan. "Remote sensing of sediment characteristics from the noise field due to a moving ship". Doctoral thesis, Universite Libre de Bruxelles, 2015. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/222087.
Pełny tekst źródłaDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Feng, Zao. "Condition Classification in Underground Pipes Based on Acoustical Characteristics. Acoustical characteristics are used to classify the structural and operational conditions in underground pipes with advanced signal classification methods". Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/9463.
Pełny tekst źródłaDuong, Ngoc. "Modélisation gaussienne de rang plein des mélanges audio convolutifs appliquée à la séparation de sources". Phd thesis, Université Rennes 1, 2011. http://tel.archives-ouvertes.fr/tel-00667117.
Pełny tekst źródłaGeay, Thomas. "Mesure acoustique passive du transport par charriage dans les rivières". Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENU052/document.
Pełny tekst źródłaAnalysing the spatio-temporal variability of solid transport processes is key to the study of fluvial morphodynamics. Our research focusses on the development of passive acoustics to monitor bedload transport. A hydrophone is used to sense the acoustic pressure in the river in order to record the sound generated by inter-particle collisions. This original method has been mostly developed in laboratories during the past decades. It has been shown that the acoustic power and the frequencies of the monitored signals are linked to bedload fluxes and granulometry. The use of passive acoustics in natural streams has encountered limited success. It is the core of our research.First we address the existence of multiple sound sources in the environment. Acoustic measurements have been realised in several types of rivers: steep channels and large gravel bed rivers. These multiple experiences along with the bibliography have allowed us to describe river soundscapes. Hydrodynamics govern the soundscape, namely turbulence, agitating surfaces, and bedload transport. Inter-particle collisions generate sound in a wide range of frequencies, which depend on their sizes. It can be masked by the occurrence of agitating surface noise in the kilohertz region. Signal processing tools are proposed to study the dynamics of the different processes composing the signal.Signal interpretation could only be achieved by understanding the propagation properties of the acoustic waves in the river. It is shown that the river acts as an acoustic wave guide. A modal approach is suggested to solve the wave equation. The model points to the existence of a cutoff frequency inversely proportional to the water depth. Observations made on the vertical variation of the field pressure are correctly simulated. The signal dependence on water depth, the structure of the bed, and the geometry of the channel are studied using this model.Finally, we analyze three chronicles of acoustic signals recorded in the field. A signal descriptor is constructed for each data set, depending on the ambient noise conditions. This descriptor is compared to other measurements of bedload transport and good correlations are found. Initiation of motion is monitored and the integrative aspect of the acoustic measure is shown. These experiences highlight the simplicity of the method and show some of its limits. It is also shown that measurements of other environmental parameters are needed to interpret the results
Hill, Adam J. "Analysis, modeling and wide-area spatiotemporal control of low-frequency sound reproduction". Thesis, University of Essex, 2012. http://hdl.handle.net/10545/230034.
Pełny tekst źródłaSilas, Kevin Alexander. "Phase Transform Time Delay Estimation to Counteract Spectral Haystacking Effects in Jet Exhaust Flow Measurements". Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/104892.
Pełny tekst źródłaMaster of Science
This study builds on a Computational Tomography (CT) technique that uses an acoustic signal and an array of receivers to measure the velocity and temperature of a gas flow field. In particular, the velocity and temperature field tested involves multiple turbulent and disruptive elements, requiring a loud and specifically designed signal. As such, a novel acoustic signal generator, the dual Hartmann generator, was designed that is both loud and produces a specific two-toned signal. The key contribution of the study was to process the data, comparing the sets of transmitted and received signals, in order to estimate the time delay amongst receiver pairs – a key input in the CT method. Traditional cross-correlation methods were inadequate, and multiple alternatives were evaluated. The Phase Transform (PHAT) technique showed the most promise, and an explanation is given for why this technique is most suitable for this type of signal.
Arciniegas, Mosquera Andrés Felipe. "Analyse de méthodes statistiques en traitement du signal pour les tomographies acoustique et ultrasonore des arbres sur pied". Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4746/document.
Pełny tekst źródłaAcoustic tomography is an imaging technique used to perform two-dimensional mappings of the radial-transverse plane of trees, based on the velocity (or the slowness) of low frequency elastic waves (<20 kHz). The images currently obtained with the commercial devices have a low spatial resolution (of the order of a few centimeters) and are difficult to interpret. These resolution is limited by the use of low frequency waves, the low number of sensors and the fact of not taking into account the properties of wood (anisotropy, heterogeneity). To date, there are no field devices using ultrasound, specially adapted for standing trees imaging. Taking into account the limitations mentioned previously, we present hereby two studies that aim to improve the quality of acoustic and ultrasonic tomography images. In the first part of this work we compare signal-processing methods for the measurement of the propagation time and we specify experimental limits of validity. The approach developed permitted to choose the signal-processing methods by characterizing their systematic and random errors associated with the noise level. In the second part of this work, a numerical study of the robustness of reconstruction algorithms is proposed. Two new reconstruction algorithms are presented and compared to two conventional algorithms used in the commercial devices. These comparison is based on the criteria related to experimental constraints (low number of sensors and noisy measurements) and technical requirements (low computation time) for use in the field
Fuller, Ryan Michael. "Adaptive Noise Reduction Techniques for Airborne Acoustic Sensors". Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1355361066.
Pełny tekst źródłaFreedman, Joseph Saul. "Using helicopter noise to prevent brownout crashes: an acoustic altimeter". Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34833.
Pełny tekst źródłaHult, Peter. "Bioacoustic principles used in monitoring and diagnostic applications /". Linköping : Univ, 2002. http://www.bibl.liu.se/liupubl/disp/disp2002/tek778s.pdf.
Pełny tekst źródłaIshizawa, William Habaro. "Análise das concentrações energéticas no limiar entre fonemas vozeados e não-vozeados e suas implicações para fins de reconhecimento de locutores dependente do discurso". Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-16042015-104351/.
Pełny tekst źródłaNowadays, many works and applications are developed focusing on computational speaker recognition. As the interest for several real applications within this area emerges, especially in biometrics, where the safety and the efficacy of the applications are extremely important, studies need to be developed in the same proportion, to evaluate the effectiveness of such approaches. Based on that, this work intends to measure the accuracy of a speaker recognition system that uses elementar features, i.e., sub-band frequency energies, associated with a probabilistic classifier, studying the viability of extracting them from the transition between voiced and unvoiced speech tags (TTVNV). Tests are carried out with different numbers of speakers and a text-dependent approach. The accuracy of the tests varies from 20.18% to 92.53%. The results are compared and reported, complementing the existent information on the use of TTVNV with quantitative data.
Frenander, Hannes. "High-order finite difference approximations for hyperbolic problems : multiple penalties and non-reflecting boundary conditions". Doctoral thesis, Linköpings universitet, Beräkningsmatematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-134127.
Pełny tekst źródłaAbel, John Trevor. "Development of a CubeSat Instrument for Microgravity Particle Damper Performance Analysis". DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/537.
Pełny tekst źródłaBouchikhi, Abdelkhalek. "Analyse des signaux AM-FM par Transformation d'Huang Teager: application à l'acoustique sous marine". Phd thesis, Université Rennes 1, 2010. http://tel.archives-ouvertes.fr/tel-00818032.
Pełny tekst źródłaHan, Dong. "Caractérisation des objets enfouis par les méthodes de traitement d'antenne". Thesis, Aix-Marseille 3, 2011. http://www.theses.fr/2011AIX30003/document.
Pełny tekst źródłaThis thesis is devoted to the study of the localization of objects buried in underwater acoustic using array processing methods and acoustic waves. We have proposed a appropriate model, taking into account the water/sediment interface. The propagation modeling thus combines the reflected wave and the refracted wave to determine a new directional vector. The directional vector developed by acoustic scattering model is used in the MUSIC method instead of the classical plane wave model. This approach can estimate both of the object coordinates (angle and distance sensor-object) of known form, in near field or far field. We propose some fast algorithms without eigendecompostion. We combine DIRECT algorithm with spline interpolation to cope with the distorted antennas of many sensors, while maintaining a low computation time. To decorrelate the received signals, we firstly use a bilinear operator. We propose a method for the case of independent groups of correlated signals using the cumulants. Then we present a method using the cumulants matrix to eliminate Gaussian noise. But in practice, the noise is not always Gaussian or the characteristics are not always known. We develope two iterative methods to estimate the interspectral matrix of noise. The first algorithm is based on an optimization technique to extract iteratively the interspectral matrix of noise. The second algorithm uses the technique of maximum likelihood to estimate the signal parameters and the noise. Finally we test the proposed algorithms with experimental data. The results quality is very good
Cexus, Jean-Christophe. "Analyse des signaux non-stationnaires par transformation de Huang, opérateur de Teager-Kaiser et transformation de Huang-Teager (THT)". Rennes 1, 2005. http://www.theses.fr/2005REN1S124.
Pełny tekst źródłaSocheleau, François-Xavier. "Communications acoustiques sous-marines sur canal fortement dispersif en temps et en fréquence : point de vue de la théorie de l'information". Phd thesis, Université de Bretagne occidentale - Brest, 2011. http://tel.archives-ouvertes.fr/tel-00638836.
Pełny tekst źródłaKoseli, Volkan. "Experimental And Theoretical Investigation Of Complex Flows By Ultrasound Doppler Velocimetry". Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610727/index.pdf.
Pełny tekst źródłavelocity auto correlation function (ACF) and UDV signal spectrum were obtained in the analysis v of flow with random velocity. Comparison of velocity ACFs from direct velocity measurements and from raw in-phase (I) and quadrature (Q) signals through derived relation, revealed that time resolution of UDV technique is not enough for getting a good velocity ACF and thus turbulence spectrum. Using I and Q signals rather than measured velocities to get velocity ACF, increased the time resolution in the order of number of pulses used for getting one velocity value (Nprn). Velocity PDF obtained from UDV spectrum was compared with the one obtained from measured velocities with the assumption of Gaussian PDF. Both velocity PDFs were consistent. Also some parameters of pipe turbulence from literature were compared with the presented findings from velocity ACF obtained from I and Q signals through derived relation. Results showed good compatibility. In the last part of the study, complex viscosity of a linear viscoelastic fluid mathematically related to spectrum of UDV for a pipe flow with small-amplitude oscillating pressure field. Generalized Maxwell model was employed to express complex viscosity terms. Zero frequency (mean flow) component of UDV spectrum was used to obtain an equation for relaxation viscosities of generalized Maxwell model. Results have revealed that UDV technique can also be used to probe some of viscoelastic material functions. In conclusion, UDV is relatively new but a promising technique for the measurement and analysis of complex flows in a non-invasive manner.
Laude, Vincent. "Contributions au traitement optique du signal et aux ondes élastiques guidées". Habilitation à diriger des recherches, Université de Franche-Comté, 2002. http://tel.archives-ouvertes.fr/tel-00005804.
Pełny tekst źródłaMonks, T. "Acoustic convolvers for analogue signal processing". Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355785.
Pełny tekst źródłaPomponi, Eraldo. "Advanced signal processing in acoustic emission". Doctoral thesis, Università Politecnica delle Marche, 2009. http://hdl.handle.net/11566/242269.
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