Dissertations / Theses on the topic 'Signal synthesi'
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FONTANA, Federico. "Physics-based models for the acoustic representation of space in virtual environments." Doctoral thesis, Università degli Studi di Verona, 2003. http://hdl.handle.net/11562/342240.
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In questo lavoro sono state affrontate alcune questioni inserite nel tema più generale della rappresentazione di scene e ambienti virtuali in contesti d’interazione uomo-macchina, nei quali la modalità acustica costituisca parte integrante o prevalente dell’informazione complessiva trasmessa dalla macchina all’utilizzatore attraverso un’interfaccia personale multimodale oppure monomodale acustica. Più precisamente è stato preso in esame il problema di come presentare il messaggio audio, in modo tale che lo stesso messaggio fornisca all’utilizzatore un’informazione quanto più precisa e utilizzabile relativamente al contesto rappresentato. Il fine di tutto ciò è riuscire a integrare all’interno di uno scenario virtuale almeno parte dell’informazione acustica che lo stesso utilizzatore, in un contesto stavolta reale, normalmente utilizza per trarre esperienza dal mondo circostante nel suo complesso. Ciò è importante soprattutto quando il focus dell’attenzione, che tipicamente impegna il canale visivo quasi completamente, è volto a un compito specifico.This work deals with the simulation of virtual acoustic spaces using physics-based models. The acoustic space is what we perceive about space using our auditory system. The physical nature of the models means that they will present spatial attributes (such as, for example, shape and size) as a salient feature of their structure, in a way that space will be directly represented and manipulated by means of them.
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ATZORI, ALESSIO. "Extraction of vocal features for health assessment and early diagnosis - Effects of measurement uncertainty on classification algorithms." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2972104.
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Bishop, Martin J. "Optical mapping signal synthesis." Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:b92096e6-7518-4150-bd02-67d5e8645881.
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Although death due to lethal cardiac arrhythmias is the leading cause of mortality in Western Society, many of the fundamental mechanisms underlying their onset, maintenance and termination, still remain poorly understood. In recent years, experimental techniques such as optical mapping have provided useful high-resolution recordings of cardiac electrical dynamics during complex arrhythmias and defibrillation episodes, which have been combined with detailed computer simulations to further our understanding of these phenomena. However, mechanistic enquiry is severely restricted as the optical mapping technique suffers from a number of distortion effects which compromise the fidelity of the experimental measurements, presenting difficulties in the comparison of experimental data with computational simulations. This Thesis presents a thorough investigation into the distortion effects encountered in optical mapping experiments, guided by the development of a coherent series of computational models. The models presented successfully characterise the specific mechanisms of fluorescent signal distortion due to photon scattering. Photon transport in cardiac tissue is modelled using both continuous (reaction-diffusion) and discrete stochastic (Monte Carlo) approaches to simulate the effects of photon scattering within the myocardium upon the recorded fluorescent signal, which include differing levels of detail and associated computational complexity. Specifically, these models are used to investigate the important role played by the complex ventricular structural anatomy, as well as the specifics of the experimental set-up itself. In addition, a tightly coupled electromechanical model of a contracting cardiac fibre is developed which provides an important first-step towards the development of a model to quantitatively assess the distortion observed when recording from a freely contracting cardiac preparation. Simulation of these distortion effects using the models allows discrimination to be made between those parts of the experimental signal which are due to underlying tissue electrophysiology and those due to artifact, facilitating a more accurate interpretation of experimentally-obtained data. The models presented succeed in two main respects. Firstly, they provide a ‘post-processing’ tool which can be added on to computational simulations of electrical activation, allowing for a more accurate and faithful comparison between simulations and experiments, helping to validate predictions made by electrical models. Secondly, they provide a higher degree of mechanistic insight into the fundemental ways in which optical signals are distorted, showing how this distortion can be maximised or controlled. The understanding and quantification of the fundemental mechanisms of optical mapping signal distortion, provided by this Thesis, therefore fulfils an important role in the study of arrhythmia mechanisms.
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Wu, David S. "Optical frequency comb locked signal synthesis." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/375133/.
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Highly stable optical frequency combs (OFCs), particularly those generated by modelocked lasers, have become important tools for frequency and time metrology, and spectroscopy. This is due to their ability to span wide bandwidths, to act as highly accurate frequency references, and to provide a direct link between the optical and radio frequencies. However, the narrow comb spacing of most mode-locked OFCs makes it difficult to access their individual modes for a wide range of other potential applications. This thesis investigates comb mode extraction from a 250 MHz spaced OFC by phase locking semiconductor lasers (slave lasers) to individual comb modes. This was achieved using optical injection locking in combination with a low bandwidth electronic feedback loop. The locking process forced a slave laser to emit at the same frequency as the comb mode it was locked to, but at its natural output power. Hence a locked slave laser effectively behaved as a ultra-narrowband filter with active gain. The locking process was characterised in terms of its long-term frequency stability over a period of 8 hours (minimum Allan deviation of less than 10-18) and its short term phase noise across a bandwidth from 100 Hz to 500 MHz (minimum integrated phase noise of 0.02 rad2). Amplification of the residual comb modes was measured and found to have a dependence on the master-slave frequency detuning. The results from numerical modelling found that this was due to phase modulation induced in the slave laser by the injected OFC and could always be suppressed by controlling the frequency detuning. Fourier synthesis of high repetition rate waveforms was explored as one of the potential applications of this phase locking technique. Multiple lasers were made coherent with one another by locking them to different modes of a common OFC. This enabled them to behave as different frequency components of a Fourier series to generate various waveforms. This was achieved by independently controlling the relative amplitude and phase of each slave laser, and combining them together. The generation of stable waveforms with at-top, triangular, parabolic, and sawtooth intensity profiles was demonstrated at a repetition rate of 100 GHz.
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Ko, Ming-Yung. "Integrated software synthesis for signal processing applications." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3459.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.Thesis research directed by: Electrical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Liebgott, Hervé Delachartre Philippe Vray Didier Wilhjelm Jens E. "Synthèse de réponse impulsionnelle en imagerie ultrasonore pour l'estimation vectorielle du déplacement mpulse response synthesis in ultrasound imaging for vectorial displacement estimation /." Villeurbanne : Doc'INSA, 2006. http://docinsa.insa-lyon.fr/these/pont.php?id=liebgott.
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Kornienko, Alexander. "Practical enantiospecific syntheses of differentially protected cyclitols and partial synthesis of a non-Hydrolyzable Phosphooligosaccharide analog related to insulin signal transduction /." Thesis, Connect to Dissertations & Theses @ Tufts University, 1999.
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Thesis (Ph.D.)--Tufts University, 1999.Adviser: Marc d'Alarcao. Submitted to the Dept. of Chemistry. Includes bibliographical references (leaves 123-128). Access restricted to members of the Tufts University community. Also available via the World Wide Web;
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Rubens, Jacob Rosenblum. "Synthetic biological circuits for continuous signal processing." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105566.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Biology, 2016.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 169-182).
Natural organisms evolved gene networks that measure continuous environmental information and adjust gene expression to maximize fitness. Engineered cells will need to be capable of similar signal processing and computation in order to operate efficaciously in complex environments, like the human body. In this thesis I describe the development of synthetic biological circuits that enable such capabilities. In the first chapter, analog gene networks are engineered to measure the concentration of molecules and to perform mathematical operations such as addition and division. Building on this work, analog gene networks are next engineered to compensate for input-sensor circuit crosstalk. Finally, in the third chapter, analog-to-digital converters are introduced to convert signals from analog gene circuits into discrete regimes of gene expression. This mixed-signal approach merges the benefits of analog signal processing and of digital signal integration to enable robust continuous signal processing. I posit that the computational architecture demonstrated herein will enable novel applications for the field of synthetic biology.
by Jacob Rosenblum Rubens.
Ph. D.
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Shoalehvar, Amin. "Synthetic Aperture Radar (SAR) Raw Signal Simulation." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/755.
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Abstract
Synthetic Aperture Radar (SAR) Raw Signal Simulation
Author: Amin Shoalehvar
Synthetic aperture radar (SAR) raw signal simulation is a useful tool for SAR system design, mission planning, processing algorithm testing, and inversion algorithm design. This thesis explores a SAR raw signal simulation. The raw signal simulation is the simulated received signal before any processing with exception of the down-converter. The simulation plays a significant role in studies concerning noise and clutter rejection and contributes toward optimizing SAR system parameters. To simulate SAR raw data, a Chirp Scaling (CS) method is used. This method [3] first stretches the input surface reflectivity of the target in the azimuth and range direction respectively. Then it derives the raw data by inverse equalizing the signal based on CS principle. This method avoids the time-domain integral operation and improves the computational efficiency. A simulation diagram, calculation and systematic process are proposed in this thesis. Finally, simulation results are presented to verify the accuracy of calculations and the efficiency of the process.
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Ramamoorthy, Divya. "Synthesis of small molecule inhibitors targeting signal transduction pathways." Scholar Commons, 2009. http://scholarcommons.usf.edu/etd/2160.
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The main aim of the study described in this thesis is the development of small molecules as inhibitors targeting signal transduction pathways, thereby treating cancer. We attempted to synthesize compounds based on the hits obtained from high throughput screening of the Chemdiv diversity set compounds. Chapter One is a general introduction to cancer, history of chemotherapeutic drugs and an introduction to signal transduction pathways. The following two chapters briefly introduce the biological targets in the authors study. Chapter Two describes the role of B-cell lymphoma type xL (Bcl-xL), in apoptosis and the development of drugs targeting Bcl-xL. Examples of Bcl-xL drugs relevant to this study have been provided.
Chapter Three introduces Src homology 2 (SH2) domain containing tyrosine phosphatase Shp2, a protein tyrosine phosphatase, as an oncogene, its role in signal transduction pathways and the recent developments in drug development towards the inhibition of this oncogene. Chapter Four gives a general introduction to microwave-assisted organic synthesis and its advantages. This chapter also describes the use of flow reactors in organic synthesis and its advantages. The following two chapters describe the author's own findings. Chapter Five focuses on the design, synthesis and biological evaluation of small molecules as inhibitors of Bcl-xL. Isoquinolinols, NSC-131734 and HL2-100 emerged as lead compounds from high throughput screening for Bcl-xL. Our strategy focused on identifying an isoquinolinol lead with increased potency.
Based on isatin hits obtained earlier through HTS screen and SAR studies in our lab, more isatin derivatives were synthesized focusing on developing inhibitors with increased cell permeability and improved potency.
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Trainor, David William. "An architectural synthesis tool for VLSI signal processing chips." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295432.
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Kim, Jung-Won 1976. "High-precision optical and microwave signal synthesis and distribution." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42230.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.Includes bibliographical references (p. 135-148).
In this thesis, techniques for high-precision synthesis of optical and microwave signals and their distribution to remote locations are presented. The first topic is ultrafast optical pulse synthesis by coherent superposition of mode-locked lasers. Timing and phase synchronization of ultrabroadband Ti:sapphire and Cr:forsterite mode-locked lasers is studied. Subfemtosecond (<0.4 fs) timing synchronization over 12 h is demonstrated. In addition to the timing lock, phase synchronization to a local oscillator with subfemtosecond accuracy (<0.5 fs) over 1000 s is achieved. Drift-free subfemtosecond timing and phase synchronization enables a phase-coherent spectrum over 1.5 octaves that has a potential to generate single-cycle optical pulses at 1 pm. The second topic is long-term stable microwave signal synthesis from mode-locked lasers. Although mode-locked lasers can produce ultralow-noise microwave signals as a form of optical pulse trains, the transfer of stability from optical to electronic domain is a highly non-trivial task. To overcome the limitations of conventional photodetection, an optoelectronic phase-locked loop based on electro-optic sampling with a differentially-biased Sagnac-loop is proposed. Long-term (>1 h) 3-mrad level phase stability of a 10.225 GHz microwave signal extracted from a mode-locked laser is demonstrated. The third topic is timing stabilized fiber links for large-scale timing distribution. Precise optical timing distribution to remote locations can result in synchronization over long distances. In doing so, acoustic noise and thermal drifts introduced to the fiber links must be canceled by a length-correction feedback loop. A single type-II phase-matched PPKTP crystal is used to construct a compact and self-aligned balanced optical cross-correlator for precise timing detection.
(cont.) Using this correlator, a 310 m long fiber link is stabilized with long-term sub-10 fs accuracy. The final topic is photonic analog-to-digital conversion of high-frequency microwave signals. Sampling of high-frequency (>10 GHz) microwave signals is challenging due to the required aperture jitter below 100 fs. An optical subsampling down- converter for analog-to-digital conversion of narrowband high-frequency microwave signals is studied. The measured signal to noise-and-distortion ratio of 1-Mbps signals at 9.5 GHz carrier frequency is 22 dB over 2 MHz bandwidth. By integrating the demonstrated techniques, large-scale femtosecond-precision timing distribution and synchronization systems can be implemented.
by Jungwon Kim.
Ph.D.
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Osuch, Piotr. "Synthesis and monolithic integration of analogue signal processing networks." Thesis, University of Pretoria, 2018. http://hdl.handle.net/2263/66382.
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Data traffic of future 5G telecommunication systems is projected to increase 10 000-fold compared to current rates. 5G fronthaul links are therefore expected to operate in the mm-wave spectrum with some preliminary International Telecommunication Union specifications set for the 71-76 and 81-86 GHz bands. Processing 5 GHz as a single contiguous band in real-time, using existing digital signal processing (DSP) systems, is exceedingly challenging. A similar challenge exists in radio astronomy, with the Square Kilometer Array project expecting data throughput rates of 15 Tbits/s at its completion. Speed improvements on existing state-of-the-art DSPs of 2-3 orders of magnitude are therefore required to meet future demands.
One possible mitigating approach to processing wideband data in real-time is to replace some DSP blocks with analog signal processing (ASP) equivalents, since analogue devices outperform their digital counterparts in terms of cost, power consumption and the maximum attainable bandwidth. The fundamental building block of any ASP is an all-pass network of prescribed response, which can always be synthesized by cascaded first- and second-order all-pass sections (with two cascaded first-order sections being a special case of the latter). The monolithic integration of all-pass networks in commercial CMOS and BiCMOS technology nodes is a key consideration for commercial adaptation of ASPs, since it supports mass production at reduced costs and operating power requirements, making the ASP approach feasible. However, this integration has presented a number of yet unsolved challenges.
Firstly, the state-of-the-art methods for synthesizing quasi-arbitrary group delay functions using all-pass elements lack a theoretical synthesis procedure that guarantees minimum-order networks. In this work an analytically-based solution to the synthesis problem is presented that produces an all-pass network with a response approximating the required group delay to within an arbitrary minimax error. This method is shown to work for any physical realization of second-order all-pass elements, is guaranteed to converge to a global optimum solution without any choice of seed values as an input, and allows synthesis of pre-defined networks described either analytically or numerically.
Secondly, second-order all-pass networks are currently primarily implemented in off-chip planar media, which is unsuited for high volume production. Component sensitivity, process tolerances and on-chip parasitics often make proposed on-chip designs impractical. Consequently, to date, no measured results of a dispersive on-chip second-order all-pass network suitable for ASP applications (delay Q-value (QD) larger than 1) have been presented in either CMOS or BiCMOS technology nodes. In this work, the first ever on-chip CMOS second-order all-pass network is proposed with a measured QD-value larger than 1. Measurements indicate a post-tuning bandwidth of 280 MHz, peak-to-nominal delay variation of 10 ns, QD-value of 1.15 and magnitude variation of 3.1 dB. An active on-chip mm-wave second-order all-pass network is further demonstrated in a 130 nm SiGe BiCMOS technology node with a bandwidth of 40 GHz, peak-to-nominal delay of 62 ps, QD-value of 3.6 and a magnitude ripple of 1.4 dB. This is the first time that measurement results of a mm-wave bandwidth second-order all-pass network have been reported.
This work therefore presents the first step to monolithically integrating ASP solutions to conventional DSP problems, thereby enabling ultra-wideband signal processing on-chip in commercial technology nodes.Thesis (PhD)--University of Pretoria, 2018.
Square Kilometer Array (SKA) project - postgraduate scholarship
Electrical, Electronic and Computer Engineering
PhD
Unrestricted
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GANESAN, SREELAKSHMI. "SYNTHESIS OF MIXED-SIGNAL SYSTEMS BASED ON RAPID PROTOTYPING." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin988815041.
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Greene, Francis Manwell. "Genetic synthesis of signal processing networks utilizing diploid/dominance /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/5891.
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Meynard, Adrien. "Stationnarités brisées : approches à l'analyse et à la synthèse." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0475.
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La non-stationnarité est caractéristique des phénomènes physiques transitoires. Par exemple, elle peut être engendrée par la variation de vitesse d'un moteur lors d'une accélération. De même, du fait de l'effet Doppler, un son stationnaire émis par une source en mouvement sera perçu comme étant non stationnaire par un observateur fixe. Ces exemples nous conduisent à considérer une classe de non-stationnarité formée des signaux stationnaires dont la stationnarité a été brisée par une opérateur de déformation physiquement pertinent. Après avoir décrit les modèles de déformation considérés (chapitre 1), nous présentons différentes méthodes permettant d'étendre l'analyse et la synthèse spectrale à de tels signaux. L'estimation spectrale des signaux revient à déterminer le spectre du processus stationnaire sous-jacent et la déformation ayant brisé sa stationnarité. Ainsi, dans le chapitre 2, nous nous intéressons à l'analyse de signaux localement déformés pour lesquels la déformation subie s'exprime simplement comme un déplacement des coefficients d'ondelettes dans le plan temps-échelle. Nous tirons profit de cet propriété pour proposer l'algorithme d'estimation du spectre instantané JEFAS. Dans le chapitre 3, nous étendons cette analyse spectrale aux signaux multi-capteurs pour lesquels l'opérateur de déformation prend une forme matricielle. Il s'agit d'un problème de séparation de sources doublement non stationnaire. Dans le chapitre 4, nous proposons un approche à la synthèse pour étudier des signaux localement déformés. Enfin, dans le chapitre 5, nous construisons une représentation temps-fréquence adaptée à l'étude des signaux localement harmoniquesNonstationarity characterizes transient physical phenomena. For example, it may be caused by a speed variation of an accelerating engine. Similarly, because of the Doppler effect, a stationary sound emitted by a moving source is perceived as being nonstationary by a motionless observer. These examples lead us to consider a class of nonstationary signals formed from stationary signals whose stationarity has been broken by a physically relevant deformation operator. After describing the considered deformation models (chapter 1), we present different methods that extend the spectral analysis and synthesis to such signals. The spectral estimation amounts to determining simultaneously the spectrum of the underlying stationary process and the deformation breaking its stationarity. To this end, we consider representations of the signal in which this deformation is characterized by a simple operation. Thus, in chapter 2, we are interested in the analysis of locally deformed signals. The deformation describing these signals is simply expressed as a displacement of the wavelet coefficients in the time-scale domain. We take advantage of this property to develop a method for the estimation of these displacements. Then, we propose an instantaneous spectrum estimation algorithm, named JEFAS. In chapter 3, we extend this spectral analysis to multi-sensor signals where the deformation operator takes a matrix form. This is a doubly nonstationary blind source separation problem. In chapter 4, we propose a synthesis approach to study locally deformed signals. Finally, in chapter 5, we construct a time-frequency representation adapted to the description of locally harmonic signals
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Davis, Michael Scott. "MIMO radar: signal processing, waveform design, and applications to synthetic aperture imaging." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53566.
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This dissertation analyzes the capability of multiple-input, multiple-output (MIMO) radar techniques to improve the image quality and area-coverage rate of synthetic aperture imaging systems. A signal processing architecture for MIMO radar is used to understand the applicability of MIMO for synthetic aperture radar (SAR) and synthetic aperture sonar (SAS) systems. MIMO SAR/SAS is shown to be a natural extension of standard multichannel synthetic aperture imaging techniques to exploit transmit degrees of freedom in addition to those used on receive. Degradation in range sidelobe performance and the associated impact on image quality is identified as a key impediment to MIMO SAR/SAS. A novel mismatched filtering approach is presented to mitigate this issue. New results in sampling theory are derived that allow the aliasing that occurs when a wide-sense stationary random process is non-uniformly sampled to be quantified. These results are applied to the case of recurrent sampling and used to quantify the impact of azimuth ambiguities on MIMO SAR/SAS image contrast.
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Charpentier, Francis. "Traitement de la parole par analyse-synthese de fourier : application a la synthese par diphones." Paris, ENST, 1988. http://www.theses.fr/1988ENST0009.
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Ces techniaues sont utilisees dans le but d'obtenir une meilleure qualite de son que celle obtenue par les methodes paramagnetiques habituelles. L'accent est mis sur la double approche suivante: 1) interpretation de la transformee de fourier a court terme comme un banc de filtres et synthese par addition des sorties de ce banc filtre; 2) synthese par superposition et addition de signaux a court terme
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She, Zhishun. "Array processing methods for calibrating Inverse Synthetic Aperture Radar and Multiple Pass Synthetic Aperture Radar." Title page, contents and abstract only, 2000. http://web4.library.adelaide.edu.au/theses/09PH/09phs5389.pdf.
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Table of corrections inserted opposite table of contents. Bibliography: p.191-212. Investigates calibration for errors of a synthetic aperture in Inverse Synthetic Aperture Radar and Multiple Pass Synthetic Aperture Radar. Both are reviewed as the problems of array processing and are solved from the point of array calibration.
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Callow, Hayden J. "Signal Processing for Synthetic Aperture Sonar Image Enhancement." Thesis, University of Canterbury. Electrical and Electronic Engineering, 2003. http://hdl.handle.net/10092/4000.
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This thesis contains a description of SAS processing algorithms, offering improvements in Fourier-based reconstruction, motion-compensation, and autofocus. Fourier-based image reconstruction is reviewed and improvements shown as the result of improved system modelling. A number of new algorithms based on the wavenumber algorithm for correcting second order effects are proposed. In addition, a new framework for describing multiple-receiver reconstruction in terms of the bistatic geometry is presented and is a useful aid to understanding. Motion-compensation techniques for allowing Fourier-based reconstruction in widebeam geometries suffering large-motion errors are discussed. A motion-compensation algorithm exploiting multiple receiver geometries is suggested and shown to provide substantial improvement in image quality. New motion compensation techniques for yaw correction using the wavenumber algorithm are discussed. A common framework for describing phase estimation is presented and techniques from a number of fields are reviewed within this framework. In addition a new proof is provided outlining the relationship between eigenvector-based autofocus phase estimation kernels and the phase-closure techniques used astronomical imaging. Micronavigation techniques are reviewed and extensions to the shear average single-receiver micronavigation technique result in a 3 - 4 fold performance improvement when operating on high-contrast images. The stripmap phase gradient autofocus (SPGA) algorithm is developed and extends spotlight SAR PGA to the wide-beam, wide-band stripmap geometries common in SAS imaging. SPGA supersedes traditional PGA-based stripmap autofocus algorithms such as mPGA and PCA - the relationships between SPGA and these algorithms is discussed. SPGA's operation is verified on simulated and field-collected data where it provides significant image improvement. SPGA with phase-curvature based estimation is shown and found to perform poorly compared with phase-gradient techniques. The operation of SPGA on data collected from Sydney Harbour is shown with SPGA able to improve resolution to near the diffraction-limit. Additional analysis of practical stripmap autofocus operation in presence of undersampling and space-invariant blurring is presented with significant comment regarding the difficulties inherent in autofocusing field-collected data. Field-collected data from trials in Sydney Harbour is presented along with associated autofocus results from a number of algorithms.
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Rigling, Brian D. "Signal processing strategies for bistatic synthetic aperture radar." Connect to this title online, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1052835606.
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Thesis (Ph. D.)--Ohio State University, 2003.Title from first page of PDF file. Document formatted into pages; contains xv, 162 p.: ill. (some col.). Includes abstract and vita. Advisor: Randolph L. Moses, Dept. of Electrical Engineering. Includes bibliographical references (p. 156-162).
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Wornell, Gregory W. "Synthesis, analysis, and processing of fractal signals." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13465.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1991.Includes bibliographical references (leaves 234-239).
by Gregory Wayne Wornell.
Ph.D.
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Jeong, Soonho. "Wideband signal analysis and synthesis applied to electromagnetic transient waveforms." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA308099.
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Mansour, Omar. "High level synthesis for non-manifest digital signal processing applications." Enschede : University of Twente [Host], 2006. http://doc.utwente.nl/51107.
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Frack, Kenneth L. Jr. "Improving transient signal synthesis through noise modeling and noise removal." Thesis, Monterey, California. Naval Postgraduate School, 1994. http://hdl.handle.net/10945/30903.
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This thesis examines signal modeling techniques and their application to ambient
ocean noise for purposes of noise removal and for generating realistic synthetic noise
to add to synthetically generated transient signals. Higher order statistics of the noise
are examined to test for Gaussianity. Stochastic approaches to AR, MA, and ARMA
modeling are compared to see which technique yields the "best" synthetic noise. Results
from the modeling process are used to develop a short-time Wiener filter which can be
used to condition a real signal for further processing through effective noise removal.
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Larreategui, Mikel. "High-quality text-to-speech synthesis using sinusoidal techniques." Thesis, Staffordshire University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309790.
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Wong, Chun-ho Eddy. "Reliability of rating synthesized hypernasal speech signals in connected speech and vowels." Click to view the E-thesis via HKU Scholars Hub, 2007. http://lookup.lib.hku.hk/lookup/bib/B4200617X.
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Thesis (B.Sc)--University of Hong Kong, 2007."A dissertation submitted in partial fulfilment of the requirements for the Bachelor of Science (Speech and Hearing Sciences), The University of Hong Kong, June 30, 2007." Includes bibliographical references (p. 28-30). Also available in print.
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Ramanana, Telina. "Synthèse de champ sonore par Wave Field Synthesis à partir d'enregistrements captés par une antenne microphonique." Mémoire, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/6062.
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Ce projet traite de la restitution par Wave Field Synthesis (WFS) d’un champ sonore
mesuré par une antenne microphonique. L’importance de la reproduction de champ sonore
de milieux industriels ou d’intérieurs de véhicule a pris son essor depuis ces dernières
années. Ainsi la capacité de pouvoir synthétiser fidèlement un champ mesuré dans une
salle dédiée à l’écoute faciliterait son analyse dans le cadre de mesures objectives (études
suivant des métriques prédéfinis) et subjectives (études de perception). La WFS s’impose
comme une technologie de reproduction de champ capable d’assurer une grande résolution
spatiale, une restitution étendue du champ d’écoute ainsi qu’une bonne précision physique
du champ sonore. L’objectif principal est de reproduire un champ fidèle en terme de : 1)
réponses en fréquences de la chaîne complète de reproduction, 2) d’erreurs de spectre
réduites, 3) bonne restitution du champ d’un point de vue des caractéristiques spatiales.
Des simulations appuyées par une campagne expérimentale ont été menées pour valider les
algorithmes de restitution proposés et définir l’approche type problème inverse régularisé
par formation de voies comme étant le plus performant.
Cette recherche est le fruit de deux ans de travaux effectués au Groupe d’Acoustique de
l’Université de Sherbrooke (GAUS).
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Yuan, Ivan. "Generation of synthetic spindle checkpoint signals." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/22030.
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The spindle checkpoint ensures proper chromosome segregation by monitoring kinetochore-microtubule interactions: unattached kinetochores recruit checkpoint proteins that combine to form a diffusible inhibitor which delays anaphase, thus buying cells time to fix attachment errors. Although the major checkpoint proteins were identified some 25 years ago, we have only just begun to understand how they assemble at unattached kinetochores to generate the crucial checkpoint signal. Much of this can be attributed to the difficulty associated with studying these proteins at the kinetochores, which are highly complex and thus often make clean dissection of function impossible. To circumvent this problem, a synthetic version of the spindle checkpoint was engineered on an ectopic location on a chromosome arm away from kinetochores in S. pombe. This work describes how the co-targeting of only two checkpoint components, the outer kinetochore protein Spc7 and the checkpoint kinase Mph1, was found to be sufficient to successfully generate a checkpoint-dependent metaphase arrest and how this paves the way for a clearer, more joined-up understanding of how the checkpoint works.
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Vu, Viet Thuy. "Ultrawideband-Ultrawidebeam Synthetic Aperture Radar – Signal Processing and Applications." Doctoral thesis, Karlskrona : Blekinge Institute of Technology, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00512.
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This dissertation presents practical issues in Ultrawideband – Ultrawidebeam (UWB) Synthetic Aperture Radar (SAR) signal processing and crucial applications developed on UWB SAR. In the context of this dissertation, UWB SAR refers to the SAR systems utilizing large fractional bandwidth signals and synthesizing long apertures associated with wide antenna beamwidths. On one hand, such specific systems give us opportunities to develop unique applications. One the other hand, signal processing for data collected by these systems is very challenging and therefore requires much effort due to their characteristics. In the signal processing part, the tools supporting the UWB SAR system design and evaluation are introduced. They include an Impulse Response Function in UWB SAR imaging (IRF-SAR), azimuth and range resolution equations for UWB SAR, and a definition of UWB SAR quality measurements. Pre-processing, processing and post-processing for UWB SAR are also topics that will be examined in the signal processing part. The processing is here defined by SAR algorithms. With this definition, the pre-processing refers to RFI suppression approaches whereas the post-processing implies apodization or sidelobe control methods. In the application part, Ground Moving Target Indication (GMTI) is selected for study due to its interest to both military and civilian end-users. GMTI developed on UWB SAR relates to the moving target detection by focusing technique which can be combined with the space-time processing such as Displaced Phase Center Antenna (DPCA) and Space-Time Adaptive Processing (STAP).
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Ajpru, Supaporn. "Signal transduction gene expression in the melatonin rhythm generating system : quantitative analysis using competitive PCR." Thesis, King's College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326268.
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Xue, Jingling. "Formal synthesis of control signals for systolic arrays." Thesis, University of Edinburgh, 1992. http://hdl.handle.net/1842/11628.
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The distinguishing features characteristic of systolic arays are synchrony of computations, local and regular connections between processors and massive decentralised parallelism. The potential of the systolic array lies in its suitability for VLSI fabrication and its practicality for a variety of application areas such as signal or image processing and numeric analysis. With the increasing possibilitites promised by advances in VLSI technology and computer architecture, more and more complex problems are now solvable by systolic arrays. This thesis describes a systematic method for the synthesis of control signals for systolic arrays that are realised in hardware. Control signals ensure that the right computations are executed at the right processors at the right time. The proposed method applies for iterative algorithms defined over a domain that can be expressed by a convex set of integer coordinates. Algorithms that can be implemented as systolic arrays can be expressed this way; a large subclass can be phrased as affine (or uniform) recurrence equations in the functional style and as nested loops in the imperative style. The synthesis of control signals from a program specification is a process of program transformation and construction. The basic idea is to replace the domain predicates in the initial program specification which constitute the abstract specification of control signals by a system of uniform recurrence equations by means of data pipelining. Then, systolic arrays with a description of both data and control signals can be obtained by a direct application of the standard space-time mapping technique.
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Hargreaves, Brock Edward. "Sparse signal recovery : analysis and synthesis formulations with prior support information." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46448.
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The synthesis model for signal recovery has been the model of choice for many years in compressive sensing. Various weighting schemes using prior support information to adjust the objective function associated with the synthesis model have been shown to improve the recovery of the signal in terms of accuracy. Generally, even with no prior knowledge of the support, iterative methods can build support estimates and incorporate that into the
recovery which has also been shown to increase the speed and accuracy of the recovery. However when the original signal is sparse with respect to a redundant dictionary (rather than an orthonormal basis) there is a coun-
terpart model to synthesis, namely the analysis model, which has been less popular but has recently attracted more attention. The analysis model is much less understood and thus there are fewer theorems available in both the context of non-weighted and weighted signal recovery.
In this thesis, we investigate weighting in both the analysis model and synthesis model in weighted l-1 minimization. Theoretical guarantees on reconstruction and various weighting strategies for each model are discussed. We give conditions for weighted synthesis recovery with frames which do not require strict incoherency conditions, this is based on recent results of regular synthesis with frames using optimal dual l-1 analysis. A novel weighting technique is introduced in the analysis case which outperforms its traditional counterparts in the case of seismic wavefield reconstruction. We also introduce a weighted split Bregman algorithm for analysis and optimal
dual analysis. We then investigate these techniques on seismic data and synthetically created test data using a variety of frames.
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Djigande, Kola. "Synthese et evaluation des performances d'architectures pour le traitement du signal." Nantes, 1995. http://www.theses.fr/1995NANT2106.
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Le travail presente propose la comparaison de deux solutions d'implementation materielle des algorithmes de traitement du signal a partir des memes donnees et dans le meme environnement. La solution retenue pour chaque algorithme est fonction du choix de l'utilisateur guide par des criteres de performances et de cout. La methode utilisee consiste: ? pour la premiere solution, a faire executer l'algorithme par un processeur de traitement du signal synthetise, ? pour la seconde solution, a elaborer un composant de type asic (circuit integre specifique) realisant la fonction definie par l'algorithme et synthetise dans les memes conditions que le processeur. L'implementation de la premiere solution qualifiee de logicielle/materielle a necessite dans un premier temps, la modelisation du processeur tms320c10. Trois modeles differents ecrits en langage de description du materiel vhdl sont elabores et valides. Cette etude nous permet de degager une methode de modelisation vhdl de processeurs de traitement du signal. Dans un second temps, l'outil compass est utilise pour synthetiser le dernier modele moyennant une revision de la description vhdl comme l'impose le synthetiseur. Associe au processeur, un composant de type memoire programme est modelise puis synthetise. Un generateur de code machine est developpe afin de traduire une description assembleur et de charger la memoire programme. L'implementation de la seconde solution qualifiee de purement materielle a necessite le developpement d'un outil de synthese haut niveau. Cet outil saisit en entree le programme assembleur ayant servi a la specification de l'algorithme et un ensemble de contraintes sur la nature et le nombre des ressources (unites fonctionnelles) fourni par l'utilisateur. A la suite des operations de codage intermediaire, de construction d'un graphe de flot de controle et de donnees optimise, d'allocation et d'ordonnancement, l'outil genere une description vhdl au niveau transfert de registres. Cette representation de sortie est ensuite synthetisee moyennant l'usage de l'outil precedemment evoque. Afin d'attenuer le probleme de portabilite au niveau de la description d'entree, une ouverture sur l'outil de cao spw (signal processing workstation), largement utilise pour le traitement du signal a ete effectuee. Ainsi, notre outil permet une specification d'un algorithme sous forme de schema saisi a l'aide de spw ou sous forme d'un programme assembleur du tms320c30 que l'outil spw peut aussi generer
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GRIMAL, BRUNO. "Synthese d'architectures autotestables dediees a des applications de traitement du signal." Rennes 1, 1994. http://www.theses.fr/1994REN10173.
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Pour concevoir des circuits integres de plus en plus complexes satisfaisant a des contraintes de temps reel fortes, des outils de synthese d'architectures ont ete mis au point, notamment dans le domaine des applications de traitement du signal sous contrainte temps reel. Nous etudions ici, une voie complementaire a la synthese de haut niveau, qui est la synthese d'architectures autotestables dediees a des applications de traitement du signal. Notre approche nous a amenes a definir un modele generique d'architectures autotestables, un modele de calcul du taux de couverture des erreurs et a developper une methodologie de conception automatique d'architectures autotestables. Nous nous interessons a la synthese d'architectures devant fonctionner sous contrainte de temps reel. Nous avons retenu, comme technique d'autotest, la technique basee sur le codage des nombres par codes separables. Cette technique repond parfaitement a la definition d'un modele generique d'architectures autotestables et au controle du surcout par l'utilisation d'une contrainte de taux de couverture. Nous avons defini un modele de calcul du taux de couverture des erreurs dans une architecture de traitement du signal. Notre modele integre la variation de la capacite de detection des erreurs en fonction du type de codage. Il prend aussi en compte les differentes complexites des operateurs pouvant etre utilises dans les architectures synthetisees. Grace a une recherche optimale des techniques de codage, notre modele permet une minimisation de la surface du circuit integre. Enfin, nous avons developpe une methodologie de conception d'architectures autotestables. Cette methodologie integre deux notions contradictoires qui sont la synthese sous contraintes de temps reel et de taux de couverture, et la synthese d'une architecture dont la surface est minimale. Cette etude nous a amenes a redefinir l'etape de l'optimisation de l'architecture (fusion des registres) de maniere a y integrer les nouvelles contraintes introduites par l'autotest. Ces etudes ont debouche sur le developpement d'un outil de synthese d'architectures autotestables pour des applications temps reel, developpe en langage c sur stations de travail de type sun. Des resultats en synthese sur des programmes tests reconnus dans le domaine du traitement du signal ainsi que sur des algorithmes d'annulation d'echo acoustique ont permis d'evaluer les performances de notre outil
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KANKIPATI, SUNDER RAJAN. "MACRO MODEL GENERATION FOR SYNTHESIS OF ANALOG AND MIXED SIGNAL CIRCUITS." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1077297705.
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Li, Shuo. "System-Level Architectural Hardware Synthesis for Digital Signal Processing Sub-Systems." Doctoral thesis, KTH, Elektronik och Inbyggda System, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-180441.
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This thesis presents a novel system-level synthesis framework called System-Level Architectural Synthesis Framework (SYLVA), which synthesizes DigitalSignal Processing (DSP) sub-systems modeled by synchronous data ?ow intohardware implementations in Application-Specific Integrated Circuit (ASIC),Field-Programmable Gate Array (FPGA) or Coarse-Grained ReconfigurableArchitecture (CGRA) style. SYLVA synthesizes in terms of pre-characterizedFunction Implementations (FIMPs). It explores the design space in threedimensions, number of FIMPs, type of FIMPs, and pipeline parallelism be-tween the producing and consuming FIMPs. SYLVA also introduces timingand interface model of FIMPs to enable reuse and automatic generation ofGlobal Interconnect and Control (GLIC) to glue the FIMPs together into aworking system. SYLVA has been evaluated by applying it to several realand synthetic DSP applications and the experimental results are analyzedfor the design space exploration, the GLIC synthesis, the code generation,and the CGRA floorplanning features. The conclusion from the experimentalresults is that by exploring the multi-dimensional design space in terms ofpre-characterized FIMPs, SYLVA explores a richer design space and does itmore effectively compared to the existing High-Level Synthesis (HLS) toolsto improve both engineering and computational efficiency.QC 20160125
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Salami, Redwan Ali. "Robust low bit rate analysis-by-synthesis predictive speech coding." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277700.
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Payne, R. G. "Digital techniques for the analysis and synthesis of audio signals." Thesis, Bucks New University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234706.
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George, E. Bryan. "An analysis-by-synthesis approach to sinusoidal modeling applied to speech and music signal processing." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/15747.
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Lampe, Dethard. "Synthesis of novel analogues of myo-inositol 1,4,5-trisphosphate." Thesis, University of Bath, 1993. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332591.
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Schlottmann, Craig Richard. "A coordinated approach to reconfigurable analog signal processing." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/49021.
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The purpose of this research is to create a solid framework for embedded system design with field-programmable analog arrays (FPAAs). To achieve this goal, we've created a unified approach to the three phases of FPAA system design: (1) the hardware architecture; (2) the circuit design and modeling; and (3) the high-level software tools. First, we describe innovations to the reconfigurable analog hardware that enable advanced signal processing and integration into embedded systems. We introduce the multiple-input translinear element (MITE) FPAA and the dynamically-reconfigurable RASP 2.9v FPAA, which was designed explicitly for interfacing with external digital systems. This compatibility creates a streamlined workflow for dropping the FPAA hardware into mixed-signal embedded systems. The second phase, algorithm analysis and modeling, is important to create a useful and reliable library of components for the system designer. We discuss the concept and procedure of analog abstraction that empowers non-circuit design engineers to take full advantage of analog techniques. We use the analog vector-matrix multiplier as an example for a detailed discussion on computational analog analysis and system mapping to the FPAA. Lastly, we describe high-level software tools, which are an absolute necessity for the design of large systems due to the size and complexity of modern FPAAs. We describe the Sim2Spice tool, which allows system designers to develop signal processing systems in the Simulink environment. The tool then compiles the system to the FPAA hardware. By coordinating the development of these three phases, we've created a solid unified framework that empowers engineers to utilize FPAAs.
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Auger, François. "Représentations temps-fréquence des signaux non-stationnaires : synthèse et contribution." Nantes, 1991. http://www.theses.fr/1991NANT2056.
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Ce mémoire concerne l'analyse temps-fréquence des signaux non-stationnaires. Après avoir montré la nécessité de ce type d'analyse, on s'intéresse aux distributions énergétiques de la classe de Cohen. Cette étude permet alors notamment de comparer ses différents éléments du point de vue de leurs propriétés théoriques, de la géométrie de leurs termes d'interférence et de leurs qualités descriptives, et de préciser les différents problèmes liés à l'obtention de leurs versions discrètes. On aborde ensuite les méthodes de représentation temps-fréquence paramétriques. On étudie tout d'abord les propriétés théoriques de certaines de ces représentations les plus classiques, en utilisant les mêmes critères que les représentations de la classe de Cohen, puis on s'intéresse aux possibilités de paramétrisation de ces dernières, et notamment de la représentation de Wigner-Ville. Enfin, on s'intéresse à différentes méthodes heuristiques d'élaboration de représentations temps-fréquence facilement lisibles et interprétables, en partant soit du spectrogramme, soit de la représentation de Wigner-Ville.
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Soraghan, John J. "Synthetic Aperture Radar signal processing on the Distributed Array Processor." Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254743.
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Jaworek, Christine H. "Synthesis of inositol phosphate glycans /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2000.
Find full textAbstract:
Thesis (Ph.D.)--Tufts University, 2000.Adviser: Marc d'Alarcao. Submitted to the Dept. of Chemistry. Includes bibliographical references (leaves 262-271). Access restricted to members of the Tufts University community. Also available via the World Wide Web;
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Mashni, Jamil Assad. "DEVELOPMENTS IN SIGNAL AMPLIFICATION BY REVERSIBLE EXCHANGE (SABRE) OF 15N AND 13C NUCLEI TOWARDS APPLICATIONS IN MRI." OpenSIUC, 2019. https://opensiuc.lib.siu.edu/theses/2516.
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Signal Amplification by Reversible Exchange (SABRE) is a hyperpolarization technique that utilizes parahydrogen for the NMR signal enhancement of nuclear spins. SABRE is related to Parahydrogen Induced Polarization (PHIP), another means of hyperpolarization using parahydrogen; PHIP achieves hyperpolarization via chemical reduction. Although PHIP and SABRE share many similarities in experimentation, PHIP ultimately requires the presence of an unsaturated chemical bond as well as pairwise-addition of parahydrogen. No permanent chemical change occurs during SABRE, and instead may be considered as a merely physical exchange between molecules with sites on a catalyst. PHIP and SABRE may be compared to Dynamic Nuclear Polarization (DNP), arguably the most well-known and researched method for hyperpolarization; despite all that has been achieved with DNP, PHIP and SABRE offer vastly more-rapid, less-expensive, and more-simplified approaches for achieving hyperpolarization. The focus of this work is experimentation with SABRE processes and methods designed to overcome certain experimental challenges associated with this technique.
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Klompje, Gideon. "A parametric monophone speech synthesis system." Thesis, Link to online version, 2006. http://hdl.handle.net/10019/561.
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Delalez, Samuel. "Vokinesis : instrument de contrôle suprasegmental de la synthèse vocale." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS458/document.
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Ce travail s'inscrit dans le domaine du contrôle performatif de la synthèse vocale, et plus particulièrement de la modification temps-réel de signaux de voix pré-enregistrés. Dans un contexte où de tels systèmes n'étaient en mesure de modifier que des paramètres de hauteur, de durée et de qualité vocale, nos travaux étaient centrés sur la question de la modification performative du rythme de la voix. Une grande partie de ce travail de thèse a été consacrée au développement de Vokinesis, un logiciel de modification performative de signaux de voix pré-enregistrés. Il a été développé selon 4 objectifs: permettre le contrôle du rythme de la voix, avoir un système modulaire, utilisable en situation de concert ainsi que pour des applications de recherche. Son développement a nécessité une réflexion sur la nature du rythme vocal et sur la façon dont il doit être contrôlé. Il est alors apparu que l'unité rythmique inter-linguistique de base pour la production du rythme vocale est de l'ordre de la syllabe, mais que les règles de syllabification sont trop variables d'un langage à l'autre pour permettre de définir un motif rythmique inter-linguistique invariant. Nous avons alors pu montrer que le séquencement précis et expressif du rythme vocal nécessite le contrôle de deux phases, qui assemblées forment un groupe rythmique: le noyau et la liaison rythmiques. Nous avons mis en place plusieurs méthodes de contrôle rythmique que nous avons testées avec différentes interfaces de contrôle. Une évaluation objective a permis de valider l'une de nos méthodes du point de vue de la précision du contrôle rythmique. De nouvelles stratégies de contrôle de la hauteur et de paramètres de qualité vocale avec une tablette graphique ont été mises en place. Une réflexion sur la pertinence de cette interface au regard de l'essor des nouvelles interfaces musicales continues nous a permis de conclure que la tablette est la mieux adaptée au contrôle expressif de l'intonation (parole), mais que les PMC (Polyphonic Multidimensional Controllers) sont mieux adaptés au contrôle de la mélodie (chant, ou autres instruments).Le développement de Vokinesis a également nécessité la mise en place de la méthode de traitement de signal VoPTiQ (Voice Pitch, Time and Quality modification), combinant une adaptation de l'algorithme RT-PSOLA et des techniques particulières de filtrage pour les modulations de qualité vocale. L'utilisation musicale de Vokinesis a été évaluée avec succès dans le cadre de représentations publiques du Chorus Digitalis, pour du chant de type variété ou musique contemporaine. L'utilisation dans un cadre de musique électro a également été explorée par l'interfaçage du logiciel de création musicale Ableton Live à Vokinesis. Les perspectives d'application sont multiples: études scientifiques (recherches en prosodie, en parole expressive, en neurosciences...), productions sonores et musicales, pédagogie des langues, thérapies vocalesThis work belongs to the field of performative control of voice synthesis, and more precisely of real-time modification of pre-recorded voice signals. In a context where such systems were only capable of modifying parameters such as pitch, duration and voice quality, our work was carried around the question of performative modification of voice rhythm. One significant part of this thesis has been devoted to the development of Vokinesis, a program for performative modification of pre-recorded voice. It has been developed under 4 goals: to allow for voice rhythm control, to obtain a modular system, usable in public performances situations as well as for research applications. To achieve this development, a reflexion about the nature of voice rhythm and how it should be controlled has been carried out. It appeared that the basic inter-linguistic rhtyhmic unit is syllable-sized, but that syllabification rules are too language-dependant to provide a invariant inter-linguistic rhythmic pattern. We showed that accurate and expressive sequencing of vocal rhythm is performed by controlling the timing of two phases, which together form a rhythmic group: the rhythmic nucleus and the rhythmic link. We developed several rhythm control methods, tested with several control interfaces. An objective evaluation showed that one of our methods allows for very accurate control of rhythm. New strategies for voice pitch and quality control with a graphic tablet have been established. A reflexion about the pertinence of graphic tablets for pitch control, regarding the rise of new continuous musical interfaces, lead us to the conclusion that they best fit intonation control (speech), but that PMC (Polyphonic Multidimensional controllers) are better for melodic control (singing, or other instruments).The development of Vokinesis also required the implementation of the VoPTiQ (Voice Pitch, Time and Quality modification) signal processing method, which combines an adaptation of the RT-PSOLA algorithm and some specific filtering techniques for voice quality modulations. The use of Vokinesis as a musical instrument has been successfully evaluated in public representations of the Chorus Digitalis ensemble, for various singing styles (from pop to contemporary music). Its use for electro music has also been explored by interfacing the Ableton Live composition environnment with Vokinesis. Application perspectives are diverse: scientific studies (research in prosody, expressive speech, neurosciences), sound and music production, language learning and teaching, speech therapies
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Pichler, Markus. "Phase-locked-loop-based signal synthesis for frequency-modulated continuos wave radar /." Linz : Trauner, 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?u20=9783854993889.
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Constaninides, George Anthony. "High level synthesis and word length optimization of digital signal processing systems." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252020.
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