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Antonakoudi, Anixi. "Interpolation techniques for unsupervised deconvolution of FIR and IIR systems." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271616.
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Doğanata, Zinnur Vaidyanathan P. P. "General structural representations for multi-input multi-output discrete-time FIR and IIR lossless systems /." Diss., Pasadena, Calif. : California Institute of Technology, 1990. http://resolver.caltech.edu/CaltechETD:etd-02222007-083438.
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Sweeney, Paul. "THE NEXT GENERATION AIRBORNE DATA ACQUISITION SYSTEMS. PART 1 - ANTI-ALIASING FILTERS: CHOICES AND SOME LESSONS LEARNED." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/605378.
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International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, NevadaThe drive towards higher accuracy and sampling rates has raised the bar for modern FTI signal conditioning. This paper focuses on the issue of anti-alias filtering. Today's 16-bit (and greater resolution) ADC’s, coupled with the drive for optimum sampling rates, means that filters have to be more accurate and yet more flexible than ever before. However, in order to take full advantage of these advances, it is important to understand the trade-offs involved and to correctly specify the system filtering requirements. Trade-offs focus on: • Analog vs. Digital signal conditioning • FIR vs. IIR Digital Filters • Signal bandwidth vs. Sampling rate • Coherency issues such as filter phase distortion vs. delay This paper will discuss each of these aspects. In particular, it will focus on some of the advantages of digital filtering various analog filter techniques. This paper will also look at some ideas for specifying filter cut-off and characteristics.
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Joakim, Holmlund. "IP block signalbehandling." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447850.
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The thesis aims to implement different digital filters such as finite impulse response (FIR), infinite impulse response (IIR) and cascade integrator comb (CIC) on the field-programmable gate array (FPGA) development board using hardware description language (VHDL). To this purpose, Intel’s systems integration tool Platform designer is used to convert the implementation to an IP core. The implemented FIR and IIR filters include different filter types such as lowpass, highpass, bandpass and bandstop. All the filters have a pipeline architecture as well as adjustable parameters such as filter order, frequency specifications and resolution. The coefficients of the filters are calculated according to the user's specifications. The calculated coefficients are verified using simulation. Furthermore the IP has been validated on hardware by the FPGA board MAX DE-10 lite. The IP is also analyzed regarding timing and power consumtion with good results. FIR filters of different types have been implemented and tested up to 501 taps with a coefficient width of 24 bits, which covered just below 50% of the available logic gates on the MAX 10-DE lite board with 50000 gates in total. The FIR filters have an option to be used with a Kaiser window with a maximum tap level of 51. Different IIR filters have also been implemented and tested on the hardware. However, the results have shown that the IIR filters do not perform so well, especially those of order higher than 6. One of the main reasons for this is the overflow caused by instability of the IIR.
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Hussein, Ali Abdulsattar. "Photonic Integrated Circuits Utilizing Nano-Electromechanical Systems on Silicon-on-Insulator Platform for Software Defined Networking in Elastic Optical Networks: New Insights Into Phased Array Systems, Tunable WDM, and Cascaded FIR and IIR Architectures." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39592.
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Optical communications systems operate at the limits of their margins to respond to increasing capacity demands. Some of the signal processing functions required must soon operate at speeds beyond electronic implementation. Optical signal processors are fundamentally analog which requires precise control of the operating state. Programmable optical components are consequently essential. The thesis explores and elucidates the properties of meshes of generalized Mach-Zehnder interferometers (GMZIs) amenable to silicon (Si) photonics integration that are based on multimode interference couplers with programmability achieved via voltage controlled phase-shift elements within the interferometer arms to perform a variety of finite impulse response (FIR) and infinite impulse response (IIR) signal processing functions.
The thesis presents a novel class of integrated photonic phased array systems with a single-stage, multistage, and feedback architectures. The designed photonic integrated systems utilize nano-electromechanical-system (NEMS) operated phase shifters of cascaded free suspended slot waveguides that are compact and require a small amount of power to operate. The structure of the integrated photonic phased array switch (IPPAS) elements is organized such that it brings the NEMS-operated phase shifters to the exterior sides of the construction; facilitating electrical connection. The transition slot couplers used to interconnect the phase shifters to the rest of the silicon structure are designed to enable biasing one of the silicon beams of each phase shifter from an electrode located at the side of the phase shifter. The other silicon beam of each phase shifter is biased through the rest of the silicon structure of the fabric, which is taken as a ground. Phased array processors of 2×2 and 4×4 multiple-input-multiple-output (MIMO) ports are conveniently designed within reasonable footprints native to the current fabrication technologies. The response of the single-stage 4×4 broadband IPPAS element is determined, and its phase synthesis states required for single-throw, double-throw and broadcast routing operations are predicted. The transmission responses of the single-stage wavelength division multiplexing (WDM) processors of 2×2 and 4×4 MIMO ports are simulated. The wavelength steering capability of the transmission interferograms by applying progressive phase shifts through the array of NEMS-operated phase shift elements of the single-stage 4×4 WDM (de)multiplexer is demonstrated.
The advantages of cascading broadband and WDM phased array sections are articulated through several study cases. Five different cascaded phased array architectures are trialed for the construction of non-blocking 4×4 IPPAS broadband switches that are essential elements in the construction of universal photonic processors. A cascaded 2×2 WDM (de)multiplexer that can set the bandwidth of the (de)multiplexed cyclic channels into a binary number of programmable values is demonstrated. The envelope and wavelength modulations of the transmission responses utilizing a cascaded forward structure of three 2×2 sections that can be utilized for the (de)multiplexing of different bandwidth channels are demonstrated providing individual wavelength steering capability of the narrowband and wideband channels and the individual wavelength steering capability of the slow envelope and wavelength modulating functions. Innovative universal 2×2 and 4×4 cascaded phased array processors of advanced high-order architectures that can function as both non-blocking broadband routers and tunable WDM (de)multiplexers with spectrum steering and bandwidth control of the (de)multiplexed demands are introduced.
The multimode interference (MMI) coupler is utilized for the construction of several IIR feedback photonic processors. Tunable photonic feedback processors have the advantage of using less number of MMI couplers compared to their counterparts of FIR forward-path processors saving on the footprint and loss merits. A passive feedback 2×2 (de)multiplexer made of a 4×4 MMI coupler and two loopback paths is proposed. The inclusion of an imbalance in the lengths of the loopback paths of the same symmetrical feedback (de)multiplexer is demonstrated to achieve wavelength modulation of the (de)multiplexed transmission responses that are useful for the (de)multiplexing of different bandwidth channels. Several newly introduced IIR feedback architectures are demonstrated to function similarly as their counterparts of FIR forward-path processors as binary bandwidth variable (de)multiplexers, envelope and wavelength modulation (de)multiplexers, and universal feedback processors.
The investigation provided in this thesis is also supported with dynamic zero-pole evolution analysis in the complex plane of analysis of the studied FIR and IIR photonic processors to enhance understanding the principle of operation. This research expands the prospective for constructing innovative silicon-on-insulator (SOI) based optical processors for applications in modern optical communication systems and programmable elastic optical networks (EONs).
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Specht, Hendrik. "MEMS-Laser-Display-System." Doctoral thesis, Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-71334.
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In der vorliegenden Arbeit werden die im Zusammenhang mit der Strahlablenkung stehenden Systemaspekte der auf MEMS-Scanner basierenden Laser-Display-Technologie theoretisch analysiert und aus den Ergebnissen die praktische Implementierung eines Laser-Display-Systems als Testplattform vorgenommen. Dabei werden mit einem Ansatz auf Basis zweier 1D-Scanner und einem weiteren Ansatz mit einem 2D-Scanner zwei Varianten realisiert. Darüber hinaus erfolgt die Entwicklung eines bildbasierten Multiparametertestverfahrens, welches sowohl für den Test komplettierter Strahlablenkeinheiten bzw. Projektionsmodule als auch zum umfassenden und zeiteffizienten Test von MEMS-Scannern auf Wafer-Level geeignet ist. Mit diesem Verfahren erfolgt eine Charakterisierung der zwei realisierten Varianten des Laser-Displays.
Ausgehend von den Eigenschaften des menschlichen visuellen Systems und den daraus resultierenden Anforderungen an das Bild sowie einer systemtheoretischen Betrachtung des mechanischen Verhaltens von MEMS-Scannern bildet die Ansteuersignalerzeugung für den resonanten Betrieb der schnellen und den quasistatischen Betrieb der langsamen Achse einen Schwerpunkt. Neben dem reinen digitalen Regler- bzw. Filterentwurf sowie mehreren Linearisierungsmaßnahmen beinhaltet dieser auch die Herleitung einer FPGA-basierten Videosignalverarbeitung zur Konvertierung von Scannpattern, Zeitregime und Auflösung mit einer entsprechenden Synchronisierung von Strahlablenkung und Lasermodulation. Auf Grundlage der daraus resultierenden Erkenntnisse über den Zusammenhang zwischen Scanner-/Systemparametern und Bildparametern werden Testbild-Bildverarbeitungsalgorithmus-Kombinationen entwickelt und diese, angeordnet in einer Sequenz, mit einem Kalibrierverfahren zu einem Testverfahren für MEMS-Scanner vervollständigt.
Die Ergebnisse dieser Arbeit entstanden im Rahmen von industriell beauftragten F&E-Projekten und fließen in die andauernde Fortführung des Themas beim Auftraggeber ein.
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Ruiz, Fontes Natanael. "An analysis of the IIR an FIR Wiener filters with applications to underwater acoustics." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA333441.
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Thesis (M.S. in Engineering Acoustics and M.S. in Electrical Engineering) Naval Postgraduate School, June 1997.Thesis advisor, Charles W. Therrien. Includes bibliographical references (p. 75). Also available online.
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McNally, Owen C. "VLSI systems for high performance IIR filter." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333291.
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Specht, Hendrik. "MEMS-Laser-Display-System: Analyse, Implementierung und Testverfahrenentwicklung." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2010. https://monarch.qucosa.de/id/qucosa%3A19558.
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In der vorliegenden Arbeit werden die im Zusammenhang mit der Strahlablenkung stehenden Systemaspekte der auf MEMS-Scanner basierenden Laser-Display-Technologie theoretisch analysiert und aus den Ergebnissen die praktische Implementierung eines Laser-Display-Systems als Testplattform vorgenommen. Dabei werden mit einem Ansatz auf Basis zweier 1D-Scanner und einem weiteren Ansatz mit einem 2D-Scanner zwei Varianten realisiert. Darüber hinaus erfolgt die Entwicklung eines bildbasierten Multiparametertestverfahrens, welches sowohl für den Test komplettierter Strahlablenkeinheiten bzw. Projektionsmodule als auch zum umfassenden und zeiteffizienten Test von MEMS-Scannern auf Wafer-Level geeignet ist. Mit diesem Verfahren erfolgt eine Charakterisierung der zwei realisierten Varianten des Laser-Displays.
Ausgehend von den Eigenschaften des menschlichen visuellen Systems und den daraus resultierenden Anforderungen an das Bild sowie einer systemtheoretischen Betrachtung des mechanischen Verhaltens von MEMS-Scannern bildet die Ansteuersignalerzeugung für den resonanten Betrieb der schnellen und den quasistatischen Betrieb der langsamen Achse einen Schwerpunkt. Neben dem reinen digitalen Regler- bzw. Filterentwurf sowie mehreren Linearisierungsmaßnahmen beinhaltet dieser auch die Herleitung einer FPGA-basierten Videosignalverarbeitung zur Konvertierung von Scannpattern, Zeitregime und Auflösung mit einer entsprechenden Synchronisierung von Strahlablenkung und Lasermodulation. Auf Grundlage der daraus resultierenden Erkenntnisse über den Zusammenhang zwischen Scanner-/Systemparametern und Bildparametern werden Testbild-Bildverarbeitungsalgorithmus-Kombinationen entwickelt und diese, angeordnet in einer Sequenz, mit einem Kalibrierverfahren zu einem Testverfahren für MEMS-Scanner vervollständigt.
Die Ergebnisse dieser Arbeit entstanden im Rahmen von industriell beauftragten F&E-Projekten und fließen in die andauernde Fortführung des Themas beim Auftraggeber ein.
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Tesařík, Jan. "Prostředí pro verifikaci digitálních filtrů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242188.
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Diploma thesis deals with design of verification environment for analyzing systems with digital filters. Verification environment is written in SystemVerilog language and it is generated by program, which is also providing generation of input data for system of filters. Matlab environment is used for gaining the reference data. The simulation of the designed involvement with digital filters is performed by program ModelSim. The most watched parameter is functional coverage which indicates how big part of the HDL description has been tested.
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Grossman, Hy, and Steve Pellarin. "A Time Correlated Approach to Adaptable Digital Filtering." International Foundation for Telemetering, 2006. http://hdl.handle.net/10150/604156.
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ITC/USA 2006 Conference Proceedings / The Forty-Second Annual International Telemetering Conference and Technical Exhibition / October 23-26, 2006 / Town and Country Resort & Convention Center, San Diego, CaliforniaSignal conditioning is a critical element in all data telemetry systems. Data from all sensors must be band limited prior to digitization and transmission to prevent the potentially disastrous effects of aliasing. While the 6th order analog low-pass Butterworth filter has long been the de facto standard for data channel filtering, advances in digital signal processing techniques now provide a potentially better alternative. This paper describes the challenges in developing a flexible approach to adaptable data channel filtering using DSP techniques. Factors such as anti-alias filter requirements, time correlated sampling, decimation and filter delays will be discussed. Also discussed will be the implementation and relative merits and drawbacks of various symmetrical FIR and IIR filters. The discussion will be presented from an intuitive and practical perspective as much as possible.
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Bau, Norberto. "Estrutura mista FIR-IIR adaptavel para identificação em tempo real de sistemas com resposta ao impulso de longa duração." reponame:Repositório Institucional da UFSC, 1991. https://repositorio.ufsc.br/handle/123456789/111692.
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Otisk, Libor. "Využití techniky C2H při implementaci algoritmů pro FPGA." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219681.
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This thesis deals with utilizing C2H technique for implementation algorithm on FPGA. Several structures of digital filters FIR and IIR are implemented within this work with usage of C2H. For such a comparison is in terms of FPGA resources utilized, the maximum frequency, latency, complexity of implementation and acceleration obtained to Nios II processor itself. Example for image processing using local operators implemented using C2h is also created to display the result on the LCD.
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Pavlikovský, Vladislav. "Využití reverberátorů pro úpravu akustiky prostoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220198.
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This diploma thesis deals with adjusting the reverberation time of enclosed spaces. It is divided into two thematic areas. The first thematic area deals with active systems that adjust the reverberation time, with a stronger focus on usage of reverberators to simulate secondary spaces. The second thematic area is the implementation of reverberators and their fundamental building blocks in Matlab.
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Hanzálek, Pavel. "Praktické ukázky zpracování signálů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-400849.
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The thesis focuses on the issue of signal processing. Using practical examples, it tries to show the use of individual signal processing operations from a practical point of view. For each of the selected signal processing operations, an application is created in MATLAB, including a graphical interface for easier operation. The division of the thesis is such that each chapter is first analyzed from a theoretical point of view, then it is shown using a practical demonstration of what the operation is used in practice. Individual applications are described here, mainly in terms of how they are handled and their possible results. The results of the practical part are presented in the attachment of the thesis.
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Kwan, Man-Wai. "Minimal transmit redundancy FIR precoder-equalizer systems design /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202004%20KWAN.
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Ferro, Humberto Fioravante. "Hybrid convex combinations for IIR system identification." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-04072016-103658/.
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The low complexity of IIR adaptive filters (AFs) is specially appealing to realtime applications but some drawbacks have been preventing their widespread use so far. For gradient based IIR AFs, adverse operational conditions cause convergence problems in system identification scenarios: underdamped and clustered poles, undermodelling or non-white input signals lead to error surfaces where the adaptation nearly stops on large plateaus or get stuck at sub-optimal local minima that can not be identified as such a priori. Furthermore, the non-stationarity in the input regressor brought by the filter recursivity and the approximations made by the update rules of the stochastic gradient algorithms constrain the learning step size to small values, causing slow convergence. In this work, we propose IIR performance enhancement strategies based on hybrid combinations of AFs that achieve higher convergence rates than ordinary IIR AFs while keeping the stability.A baixa complexidade dos filtros adaptativos (FAs) IIR é atrativa para aplicações em tempo real, mas certos inconvenientes têm impedido sua ampla utilização até agora. Para os FAs baseados no gradiente descendente, condições operacionais adversas suscitam problemas de convergência em cenários de identificação de sistemas: pólos subamortecidos ou agrupados, submodelagem ou sinais correlacionados originam superfícies de erro onde a adaptação desacelera em grandes planícies ou para em mínimos locais sub-ótimos que não podem ser identificados como tais a priori. Além disso, a não-estacionaridade do regressor de entrada causada pela recursividade do filtro e as aproximações feitas pelas regras de atualização dos algoritmos de gradiente estocástico restringem o passo de aprendizado a valores pequenos, retardando a convergência. Neste trabalho, propomos estratégias de aprimoramento de desempenho baseadas em combinações híbridas e estáveis de FAs que alcançam taxas de convergências mais altas do que FAs IIR comuns.
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Schoerner, Sven-Markus, and Erik Zakrisson. "Audioeffects with digital soundprocessing." Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-3777.
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To effectively demonstrate the strength of using digital signal processing when producing sound effects, a sound effects demo is used at the lectures of the course TSRT78, Digital signal processing, which is given at the university in Linköping.
The amount of effects, that in an instructive way can be used for an educational purpose, are many and the existing version of the sound effects demo is somewhat limited in its range of effects.
This reports main focus lies in the presentation of what kind of effects which can be interesting in this kind of demo. All of the effects are presented with their background theory and examples on how they can be implemented in software, mainly with the focus on MATLABTM. Investigations on how well the effects can be run in realtime, in the toolbox SimulinkTM, has been made.
In the report there is also a presentation of a new version of the sound effect demo that has been produced with user friendlieness and further updates in mind. In the new demo all of the effects are implemented, according to their presentations. The report finishes with suggestions for further work on the sound effects demo.
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Tarumi, Toshiyasu. "Data Analysis Strategies for Airborne Remote Sensing of Volatile Organic Compounds Using Passive Fourier Transform Infrared Spectrometry." Ohio University / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1088534216.
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Sheikh, Zaka Ullah. "Efficient Realizations of Wide-Band and Reconfigurable FIR Systems." Doctoral thesis, Linköpings universitet, Elektroniksystem, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-74796.
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Complexity reduction is one of the major issues in today’s digital system designfor many obvious reasons, e.g., reduction in area, reduced power consumption,and high throughput. Similarly, dynamically adaptable digital systems requireflexibility considerations in the design which imply reconfigurable systems, wherethe system is designed in such a way that it needs no hardware modificationsfor changing various system parameters. The thesis focuses on these aspects ofdesign and can be divided into four parts. The first part deals with complexity reduction for non-frequency selectivesystems, like differentiators and integrators. As the design of digital processingsystems have their own challenges when various systems are translated from theanalog to the digital domain. One such problem is that of high computationalcomplexity when the digital systems are intended to be designed for nearly fullcoverage of the Nyquist band, and thus having one or several narrow don’t-carebands. Such systems can be divided in three categories namely left-band systems,right-band systems and mid-band systems. In this thesis, both single-rate andmulti-rate approaches together with frequency-response masking techniques areused to handle the problem of complexity reduction in non-frequency selectivefilters. Existing frequency response masking techniques are limited in a sensethat they target only frequency selective filters, and therefore are not applicabledirectly for non-frequency selective filters. However, the proposed approachesmake the use of frequency response masking technique feasible for the non-frequency filters as well. The second part of the thesis addresses another issue of digital system designfrom the reconfigurability perspective, where provision of flexibility in the designof digital systems at the algorithmic level is more beneficial than at any otherlevel of abstraction. A linear programming (minimax) based technique forthe coefficient decimation FIR (finite-length impulse response) filter design isproposed in this part of thesis. The coefficient decimation design method findsuse in communication system designs in the context of dynamic spectrum accessand in channel adaptation for software defined radio, where requirements can bemore appropriately fulfilled by a reconfigurable channelizer filter. The proposedtechnique provides more design margin compared to the existing method whichcan in turn can be traded off for complexity reduction, optimal use of guardbands, more attenuation, etc. The third part of thesis is related to complexity reduction in frequencyselective filters. In context of frequency selective filters, conventional narrow-band and wide-band frequency response masking filters are focused, where variousoptimization based techniques are proposed for designs having a small number ofnon-zero filter coefficients. The use of mixed integer linear programming (MILP)shows interesting results for low-complexity solutions in terms of sparse andnon-periodic subfilters. Finally, the fourth part of the thesis deals with order estimation of digitaldifferentiators. Integral degree and fractional degree digital differentiators areused in this thesis work as representative systems for the non-frequency selectivefilters. The thesis contains a minimax criteria based curve-fitting approach fororder estimation of linear-phase FIR digital differentiators of integral degree upto four.
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Theuer, Michael. "Terahertz time-domain spectroscopy systems for fundamental and industrial applications." Göttingen Cuvillier, 2008. http://d-nb.info/996276696/04.
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Erdogan, Ahmet Teyfik. "Low power FIR filter implementations for VLSI-based DSP systems." Thesis, Cardiff University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312049.
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Ryšavý, Marek. "Zlomkooktává analýza akustických signálů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241138.
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The diploma thesis is focused on design and optimalization of digital octave and fraction-octave band filters. This thesis describe the behavior of filters in systems with fixed point arithmetics and investigate the impact of quantization coefficients for frequency response of filter. Filters, whitch has been designed, are implemented into simple software in C. Designed filters are in accordance with standard IEC 61260.
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Kulkarni, Mandar Shashikant. "Implementation of a 1GHZ frontend using transform domain charge sampling techniques." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3158.
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Aktas, Metin. "Lse And Mse Optimum Deconvolution." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605111/index.pdf.
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In this thesis, we considered the deconvolution problem when the channel is known a priori. LSE and MSE optimum solutions are investigated with deterministic and statistical approaches. We derived closed form LSE expressions and investigated the factors that affect the FIR inverse filters. It turns out that, minimum LSE can be obtained when the system zeros are distributed homogeneously on the z-plane. We proposed partition-based FIR-IIR inverse filters. The selection of FIR and IIR parts is based on partitioning the channel zeros into two regions and using the specified channel zeros to design the best delay FIR and all pole IIR inverse filters. Three methods for partitioning are presented, namely unit circle-based, ring-based and optimum-partitioning. It turns out that ring-based and optimum-partitioning FIR-IIR inverse filter performs better than the best delay FIR inverse filter for the same complexity by about 4-5 dB. For noisy observations, it is shown that, noise should also be considered in the delay selection and partitioning. We extended our results for the design of MSE optimum statistical inverse filters. It is shown that best delay FIR-IIR inverse filters are less sensitive to the estimation errors compared to the IIR Wiener filters and they perform better than the FIR Wiener filters. Furthermore, they are always causal and stable making them suitable for real-time implementations. When the statistical and deterministic filters are compared, it is shown that for low SNR statistical filters perform better by about 1-2 dB, while deterministic filters perform better by about 0.5-1 dB for high SNR
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Johnson, Jay Michael. "Host selection behavior of the Douglas-fir pitch moth, Synanthedon novaroensis (Hy. Edwards) (Lepidoptera:Sesiidae), related to intermediate silvicultural activities /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/5486.
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Lee, Bong-Woon. "Applications of signal processing techniques in direct-sequence spread spectrum communication systems." Ohio : Ohio University, 1990. http://www.ohiolink.edu/etd/view.cgi?ohiou1173208101.
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Srinivas, L. "FIR System Identification Using Higher Order Cumulants -A Generalized Approach." Thesis, Indian Institute of Science, 1994. http://hdl.handle.net/2005/637.
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The thesis presents algorithms based on a linear algebraic solution for the identification of the parameters of the FIR system using only higher order statistics when only the output of the system corrupted by additive Gaussian noise is observed.
All the traditional parametric methods of estimating the parameters of the system have been based on the 2nd order statistics of the output of the system. These methods suffer from the deficiency that they do not preserve the phase response of the system and hence cannot identify non-minimum phase systems. To circumvent this problem, higher order statistics which preserve the phase characteristics of a process and hence are able to identify a non-minimum phase system and also are insensitive to additive Gaussian noise have been used in recent years.
Existing algorithms for the identification of the FIR parameters based on the higher order cumulants use the autocorrelation sequence as well and give erroneous results in the presence of additive colored Gaussian noise. This problem can be overcome by obtaining algorithms which do not utilize the 2nd order statistics.
An existing relationship between the 2nd order and any Ith order cumulants is generalized to a relationship between any two arbitrary k, Ith order cumulants. This new relationship is used to obtain new algorithms for FIR system identification which use only cumulants of order > 2 and with no other restriction than the Gaussian nature of the additive noise sequence. Simulation studies are presented to demonstrate the failure of the existing algorithms when the imposed constraints on the 2nd order statistics of the additive noise are violated while the proposed algorithms perform very well and give consistent results.
Recently, a new algebraic approach for parameter estimation method denoted the Linear Combination of Slices (LCS) method was proposed and was based on expressing the FIR parameters as a linear combination of the cumulant slices. The rank deficient cumulant matrix S formed in the LCS method can be expressed as a product of matrices which have a certain structure. The orthogonality property of the subspace orthogonal to S and the range space of S has been exploited to obtain a new class of algorithms for the estimation of the parameters of a FIR system. Numerical simulation studies have been carried out to demonstrate the good behaviour of the proposed algorithms.
Analytical expressions for the covariance of the estimates of the FIR parameters of the different algorithms presented in the thesis have been obtained and numerical comparison has been done for specific cases.
Numerical examples to demonstrate the application of the proposed algorithms for channel equalization in data communication and as an initial solution to the cumulant matching nonlinear optimization methods have been presented.
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Guagliumi, Luca. "Metodi di pianificazione di traiettorie anti-slohing." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Find full textAbstract:
Lo scopo della tesi è quello di studiare delle leggi di moto tali da minimizzare il fenomeno dello sloshing, ovvero dell'agitazione del liquido contenuto all'interno di recipienti quando questi ultimi vengono movimentati. Per risolvere il problema si è partiti dallo studio del fenomeno fisico. Sulla base del materiale reperito in letteratura si costruiscono dei modelli meccanici equivalenti per analizzare al meglio la situazione. Una volta individuati i modelli si sono applicati dei metodi, noti in letteratura, per lo studio di traiettorie che minimizzino le vibrazioni meccaniche agenti sul sistema. Per concludere sono state effettuate delle simulazioni numeriche tramite il software Matlab e delle prove sperimentali per verificare la validità delle soluzioni proposte.
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Jíša, Pavel. "Využití jazyka C při implementaci algoritmů pro FPGA." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219682.
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This diploma thesis is engaged in implementations of algorithms for signal filtering in the field programmable gate array utilising the C and ImpulseC programming language. It is focused on one-dimensional FIR and IIR filters and also two-dimensional such as convolution and Sobel's operator. Moreover, evaluations of these filter algorithms are included.
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Thunholm, Malin. "Pulse Oximetry : Signal Processing in real time on Raspberry Pi." Thesis, KTH, Skolan för teknik och hälsa (STH), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-210234.
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This thesis introduces the reader into RespiHeart, which is a product under development. RespiHeart is an complement/alternative to the regular Pulse Oximeter and is intended to be used within the health care sector for combined measurements and communication on open inexpensive platforms. This thesis evaluates interaction between RespiHeart and a Raspberry Pi 3 Model B to evaluate if the computer is capable of handling the data from RespiHeart and make signal processing. Python is used throughout the whole project and is a suitable language for interaction and signal processing in real time.Detta examensarbete introducerar läsaren till RespiHeart, en ny trådlös produkt som är under utveckling. RespiHeart är ett komplement/alternativ till den nuvarande Pulsoximetern och är tänkt att användas inom sjukvården för analys, kommuniakation och kombinerade mätningar på öppna billiga plattformar. Detta project utvärderar interaktionen mellan RespiHeart och en Raspberry Pi 3 Model B för att undersöka om datorn är kapabel till att hantera datan från RespiHeart samt göra signal processing i real tid. Programmeringsspråket Python användes under hela projektet och är ett lämpligt språk att använda för interation och signal processing i real tid.
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Nayebi, Kambiz. "A time domain framework for the analysis and design of FIR multirate filter bank systems." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/13867.
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Mirats, Tur Josep M. (Josep Maria). "Qualitative modelling of complex systems by means of fuzzy inductive reasoning. Variable selection and search space reduction." Doctoral thesis, Universitat Politècnica de Catalunya, 2001. http://hdl.handle.net/10803/6180.
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Fuzzy Inductive Reasoning (FIR) is a modelling and simulation methodology capable of generating a qualitative input-output model of a system from real-valued trajectories of its physical variables. The functioning basis of FIR is to qualitatively learn the behaviour of a system from its past real data. This is an interesting feature when dealing with ill-defined, usually large-scale systems, for which an accurate description is not available but only data trajectories of the process.FIR finds in a (huge) search space model the so-called optimal mask that indicates which variables best explain any given output. Unfortunately, any algorithm that can find the optimal mask is necessarily of exponential complexity, i.e., the number of masks to be visited grows exponentially with the number of available input variables. This makes the FIR methodology, in its actual implementation, impractical for those cases in which it would be most useful, i.e., large-scale systems.
The thesis discusses whether sub-optimal search algorithms or methods of pre-simplifying a large-scale system are most suitable for dealing effectively and efficiently with the problem of deriving qualitative FIR models for them. The mask search space of FIR must be reduced in order to compute a model of a large-scale system in an affordable amount of time. To this aim, basically two lines of thought are given in the present dissertation. The first one is to directly simplify the candidate mask that is proposed to FIR. This can be done either directly, by reducing the number of input variables to the FIR model, or indirectly, using sub-optimal mask search algorithms. Two new sub-optimal mask search algorithms are proposed. The first method is another variant of a hill-climbing technique, which results in a high-quality mask while still converging in polynomial time. The second method is a new variant of a statistical approach that is based on spectral coherence functions.
The second line of research in this dissertation is to obtain a decomposition of the system into subsystems. This would allow obtaining a model of the system from its subsystems, which in turn reduces the computational time needed for the overall effort. Given a k-variable system, the cost of computing a unique k-variable model is much higher than computing a set of p models of jp < k variables.
With these complementary lines of work, two complete methodologies can be proposed, each of which enables the construction of qualitative models of complex systems. The former, based in simplifying the number of potential inputs to the FIR models, is an energy-based method, capable of detecting the variables at given delays that are more closely related to the considered output of the system. The latter proposes a decomposition of the overall system into subsystems. With the research presented in this thesis, the FIR modelling capabilities have been extended with capabilities for modelling large-scale systems within a reasonable time.
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Jiang, Xin. "A Systematic Approach for Digital Hardware Realization of Fractional-Order Operators and Systems." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1386649994.
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Ye, Haixiong. "Impact des transformations algorithmiques sur la synthèse de haut niveau : application au traitement du signal et des images." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-01061200.
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La thèse porte sur l'impact d'optimisations algorithmiques pour la synthèse automatique HLS pour ASIC. Ces optimisations algorithmiques sont des transformations de haut niveau, qui de part leur nature intrinsèque restent hors de porter des compilateurs modernes, même les plus optimisants. Le but est d'analyser l'impact des optimisations et transformations de haut niveau sur la surface, la consommation énergétique et la vitesse du circuit ASIC. Les trois algorithmes évalués sont les filtres non récursifs, les filtres récursifs et un algorithme de détection de mouvement. Sur chaque exemple, des gains ont été possibles en vitesse et/ou en surface et/ou en consommation. Le gain le plus spectaculaire est un facteur x12.6 de réduction de l'énergie tout en maitrisant la surface de synthèse et en respectant la contrainte d'exécution temps réel. Afin de mettre en perspective les résultats (consommation et vitesse), un benchmark supplémentaire a été réalisé sur un microprocesseur ST XP70 avec extension VECx, un processeur ARM Cortex avec extension Neon et un processeur Intel Penryn avec extensions SSE.
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Pyaram, Yadagiri, and Md Mashiur Rahman. "Radar Signal Processing on Ambric Platform : Implementing FFT and FIR algorithms and mapping on Ambric processor to evaluate massive parallelism." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-6148.
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The advanced signal processing systems of today require extreme data throughput and low power consumption.The only way to accomplish this is to use parallel processor architecture with efficient algorithms.The aim of this thesis was to evaluate the use of parallel processor architecture in Radar signal processingapplications where the processor has to compute complex calculations. This has been done by implementingdemanding algorithms on Ambric Am2000 family Massively Parallel Processor Array (MPPA). The Ambricplatform evaluated in terms of Latency, Cycle Count per output sample and Efficiency of the developmenttools.The two algorithms chosen for implementation are Fast Fourier Transform (FFT) and Finite Impulse Response(FIR) algorithms. We have implemented parameterized versions of FFT and FIR. The FFT algorithmimplemented for N-point input for the range of 8 point to 32 point for complex input variables. It works for anygiven number of inputs within the range for given parameter values and mapped on Ambric processor withfixed point radix - 2. Another one is FIR algorithm for the range of 12 Taps to 64 Taps for complex inputvariables. The Implementation of algorithms shows that high level of parallelism can be achieved in MassivelyParallel Processing Arrays (MPPA) especially on complex algorithms like FFT and FIR.
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Logette, Patrice. "Etude et réalisation d'un processeur acousto-optique numérique de traitement des signaux." Valenciennes, 1997. https://ged.uphf.fr/nuxeo/site/esupversions/bbfd31df-2499-46a6-843d-52f346b1db41.
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Un système hybride acousto-optique/numérique axe principalement sur le filtrage F. I. R. A été développé au laboratoire dans le cadre d'une thèse antérieure. L'objet du présent travail est, d'une part, d'améliorer le système existant et, d'autre part, de tester les aptitudes du système ainsi modifié à effectuer d'autres types de calcul. Nous commençons par un résumé des travaux relatifs à l'ancien système, afin de bien positionner le problème. Nous exposons ensuite la conception du nouveau système. Une première partie décrit les modifications des circuits électroniques, avec l'utilisation de circuits de logique programmable de marque Altera. Une seconde partie est dédiée à l'aspect commande. On y détaille le programme de pilotage du système, la création et l'utilisation de modules indépendants pour chaque type de calcul, ainsi que les utilitaires associés (simulation, génération d'algorithmes). Nous terminons par une présentation de quelques exemples de calculs (FIR, IIR, DFT, DCT, corrélation) et évaluons les performances de notre système pour chacun de ces types d’opérations. Le bilan est assez satisfaisant dans l'ensemble, bien que l'apport des circuits Altera ne se soit pas révélé à la hauteur de nos espérances. Le filtrage IIR est le moins performant et nécessiterait la recherche d'autres algorithmes. Cependant, pour être réellement opérationnel, il faudrait améliorer la partie acousto-optique, ou à moyen terme, passer au tout numérique. Nous pourrions, alors, disposer d'un système simple et pratique pour simuler, tester ou valider, sur maquette, des algorithmes ou des sous-systèmes développés au laboratoire dans divers domaines du traitement de signal.
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Randeny, Tharindu D. "Multi-Dimensional Digital Signal Processing in Radar Signature Extraction." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1451944778.
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Sklar, Alexander Gabriel. "Channel Modeling Applied to Robust Automatic Speech Recognition." Scholarly Repository, 2007. http://scholarlyrepository.miami.edu/oa_theses/87.
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In automatic speech recognition systems (ASRs), training is a critical phase to the system?s success. Communication media, either analog (such as analog landline phones) or digital (VoIP) distort the speaker?s speech signal often in very complex ways: linear distortion occurs in all channels, either in the magnitude or phase spectrum. Non-linear but time-invariant distortion will always appear in all real systems. In digital systems we also have network effects which will produce packet losses and delays and repeated packets. Finally, one cannot really assert what path a signal will take, and so having error or distortion in between is almost a certainty. The channel introduces an acoustical mismatch between the speaker's signal and the trained data in the ASR, which results in poor recognition performance. The approach so far, has been to try to undo the havoc produced by the channels, i.e. compensate for the channel's behavior. In this thesis, we try to characterize the effects of different transmission media and use that as an inexpensive and repeatable way to train ASR systems.
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Sousa, Leonardo Cheles. "Modelo de histerese para ferrites de potência." reponame:Repositório Institucional da UFABC, 2018.
Find full textAbstract:
Orientador: Prof. Dr. Luiz Alberto Luz de AlmeidaCoorientador: Prof. Dr. Carlos Eduardo Capovilla
Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia Elétrica, Santo André, 2018.
O trabalho apresenta uma extensao da limitacao estatica Loop Proximity (..2..) do modelo de histerese para incorporar a componente reversivel de magnetizacao dependente de taxa para modelar nucleos de ferrite de energia e, possivelmente, materiais ferromagneticos baseados em ferro e niquel para aplicacoes de baixa frequencia. O modelo proposto e baseado em a combinacao do modelo estatico (..2..) com um filtro discreto dinamico linear de uma resposta de impulso infinita. Dois casos em que a histerese depende da frequencia de excitacao apresentada usando dados sinteticos para validar a capacidade do modelo para representar o comportamento de nucleos fisicos reais. A tecnica de otimizacao por enxames de particulas e empregada como um metodo para estimacao de parametros no resultado modelo estatico-dinamico nao linear. Os resultados da simulacao sao apresentados indicando que trouxemos a comunidade eletronica de potencia um modelo de nucleo promissor e alternativo para componentes magneticos usado em fontes de energia renovaveis.
We present an extension of the static Limiting Loop Proximity ..2.. hysteresis model to incorporate reversible magnetization and rate-dependency to model power ferrite cores and, possibly, ferromagnetic materials based on iron and nickel for low-frequency applications. The proposed model is based on the combination of the ..2.. static model with a dynamical discrete linear filter of an infinite impulse response. Two cases where the hysteresis depends on the excitation frequency are presented using synthetic data to validate de capacity of the model to behave as real physical cores. The particle swarm optimization is employed as a method for parameter estimation in the resulting nonlinear static-dynamic model. Simulation results are presented indicating that we brought to the power electronic community apromising and alternative core model for magnetic components used in renewable power sources.
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Sun, Yi-Ran. "Generalized Bandpass Sampling Receivers for Software Defined Radio." Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4009.
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Sridharan, M. K. "Subband Adaptive Filtering Algorithms And Applications." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/266.
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In system identification scenario, the linear approximation of the system modelled by its impulse response, is estimated in real time by gradient type Least Mean Square (LMS) or Recursive Least Squares (RLS) algorithms. In recent applications like acoustic echo cancellation, the order of the impulse response to be estimated is very high, and these traditional approaches are inefficient and real time implementation becomes difficult. Alternatively, the system is modelled by a set of shorter adaptive filters operating in parallel on subsampled signals. This approach, referred to as subband adaptive filtering, is expected to reduce not only the computational complexity but also to improve the convergence rate of the adaptive algorithm. But in practice, different subband adaptive algorithms have to be used to enhance the performance with respect to complexity, convergence rate and processing delay. A single subband adaptive filtering algorithm which outperforms the full band scheme in all applications is yet to be realized.
This thesis is intended to study the subband adaptive filtering techniques and explore the possibilities of better algorithms for performance improvement. Three different subband adaptive algorithms have been proposed and their performance have been verified through simulations. These algorithms have been applied to acoustic echo cancellation and EEG artefact minimization problems.
Details of the work
To start with, the fast FIR filtering scheme introduced by Mou and Duhamel has been generalized. The Perfect Reconstruction Filter Bank (PRFB) is used to model the linear FIR system. The structure offers efficient implementation with reduced arithmetic complexity. By using a PRFB with non adjacent filters non overlapping, many channel filters can be eliminated from the structure. This helps in reducing the complexity of the structure further, but introduces approximation in the model. The modelling error depends on the stop band attenuation of the filters of the PRFB. The error introduced due to approximation is tolerable
for applications like acoustic echo cancellation.
The filtered output of the modified generalized fast filtering structure is given by
(formula)
where, Pk(z) is the main channel output, Pk,, k+1 (z) is the output of auxiliary channel filters at the reduced rate, Gk (z) is the kth synthesis filter and M the number of channels in the PRFB. An adaptation scheme is developed for adapting the main channel filters. Auxiliary channel filters are derived from main channel filters.
Secondly, the aliasing problem of the classical structure is reduced without using the cross filters. Aliasing components in the estimated signal results in very poor steady state performance in the classical structure. Attempts to eliminate the aliasing have reduced the computation gain margin and the convergence rate. Any attempt to estimate the subband reference signals from the aliased subband input signals results in aliasing. The analysis filter Hk(z) having the following antialiasing property
(formula)
can avoid aliasing in the input subband signal. The asymmetry of the frequency response prevents the use of real analysis filters. In the investigation presented in this thesis, complex analysis filters and real'synthesis filters are used in the classical structure, to reduce the aliasing errors and to achieve superior convergence rate.
PRFB is traditionally used in implementing Interpolated FIR (IFIR) structure. These filters may not be ideal for processing an input signal for an adaptive algorithm. As third contribution, the IFIR structure is modified using discrete finite frames. The model of an FIR filter s is given by Fc, with c = Hs. The columns of the matrix F forms a frame with rows of H as its dual frame. The matrix elements can be arbitrary except that the transformation should be implementable as a filter bank. This freedom is used to optimize the filter bank, with the knowledge of the input statistics, for initial convergence rate enhancement .
Next, the proposed subband adaptive algorithms are applied to acoustic echo cancellation problem with realistic parameters. Speech input and sufficiently long Room Impulse Response (RIR) are used in the simulations. The Echo Return Loss Enhancement (ERLE)and the steady state error spectrum are used as performance measures to compare these algorithms with the full band scheme and other representative subband implementations.
Finally, Subband adaptive algorithm is used in minimization of EOG (Electrooculogram) artefacts from measured EEG (Electroencephalogram) signal. An IIR filterbank providing sufficient isolation between the frequency bands is used in the modified IFIR structure and this structure has been employed in the artefact minimization scheme. The estimation error in the high frequency range has been reduced and the output signal to noise ratio has been increased by a couple of dB over that of the fullband scheme.
Conclusions
Efforts to find elegant Subband adaptive filtering algorithms will continue in the future. However, in this thesis, the generalized filtering algorithm could offer gain in filtering complexity of the order of M/2 and reduced misadjustment . The complex classical scheme offered improved convergence rate, reduced misadjustment and computational gains of the order of M/4 . The modifications of the IFIR structure using discrete finite frames made it possible to eliminate the processing delay and enhance the convergence rate. Typical performance of the complex classical case for speech input in a realistic scenario (8 channel case), offers ERLE of more than 45dB. The subband approach to EOG artefact minimization in EEG signal was found to be superior to their fullband counterpart.
(Refer PDF file for Formulas)
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Son, Han-Woong. "A Fully Integrated Fractional-N Frequency Synthesizer for Wireless Communications." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5254.
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A fully integrated, fast-locking fractional-N frequency synthesizer is proposed and demonstrated in this work. In this design, to eliminate the need for large, inaccurate capacitors and resistors in a loop filter, an analog continuous-time loop filter whose performance is sensitive to process and temperature variations and aging has been replaced with a programmable digital Finite Impulse Response (FIR) filter. In addition, using the adaptive loop gain control proportional to the frequency difference, the frequency-locking time has been reduced. Also, the phase noise and spurs have been reduced by a Multi-stAge noise SHaping (MASH) controlled Fractional Frequency Detector (FFD) that generates a digital output corresponding directly to the frequency difference. The proposed frequency synthesizer provides many benefits in terms of high integration ability, technological robustness, fast locking time, low noise level, and multimode flexibility.
To prove performance of the proposed frequency synthesizer, the frequency synthesizers analysis, design, and simulation have been carried out at both the system and the circuit levels. Then, the performance was also verified after fabrication and packaging.
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Lucas, Noëmie. "Le pouvoir de la terre : essai d'histoire de la société bas-iraqienne au IIe/VIIIe siècle." Thesis, Paris 1, 2020. https://ecm.univ-paris1.fr/nuxeo/site/esupversions/04e122c6-6794-4ba7-b5b7-078703297eb5.
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Cette thèse propose un essai d’histoire de la société du sud de l’Iraq au IIe siècle de l’Hégire (VIIIe siècle) à partir d’une réflexion sur le pouvoir de la terre. Elle se concentre sur la région de Basse-Mésopotamie caractérisée par un paysage organisé par le Tigre et l’Euphrate et leur système de canaux, ainsi que par des marais. Nous y étudions la société bas-iraqienne en prenant en considération son hétérogénéité religieuse et sociale. Nous mettons en particulier l’accent sur les relations de cette société de la terre avec l’État au IIe/VIIIe siècle, période pendant laquelle deux dynasties se succédèrent, les Omeyyades jusqu’en 132/750 puis les Abbassides, et nous interrogeons ce changement de pouvoir pour l’histoire foncière de la région. À partir d’un corpus littéraire, composé en grande partie de sources narratives à intention historique et de sources à vocation normative, en particulier portant sur la jurisprudence fiscale, et qui ne sont, le plus souvent, pas contemporaines de la période envisagée, nous proposons une histoire qui prend en considération la formalisation littéraire et la dimension socio-économique. Ce travail sur la mise en récit de l’histoire et du droit permet de proposer un double tableau de la société foncière bas-iraqienne au IIe/VIIIe siècle : à la fois celui que les sources présentent et celui qui déborde de leur projet historiographique. Un intérêt particulier est porté à l’analyse du processus historique de la genèse de l’État. Nous montrons comment le pouvoir agit sur la terre bas-iraqienne tout en devant, pour cela, composer avec les gens de la terre. Nous interrogeons donc la manière dont la région est gouvernée, pour considérer particulièrement la question fiscale et la propriété de la terre. Nous mettons l’accent sur les acteurs (les administrateurs, les propriétaires, les paysans) et les processus : les modalités d’acquisition de terres (héritage, achat, concession, revivification), les conflits fonciers, l’exploitation des domaines. Nous observons comment le pouvoir de la terre dans le Bas-Iraq au IIe/VIIIe siècle s’exprime notamment par la capacité d’action des populations à se défendre et à agir sur le pouvoir de l’État sur leurs terresThis thesis offers an attempt at a social history of Southern Iraq during the second/eight century based on a discussion of the power of the land. It concentrates on the region of Lower Mesopotamia, which is characterized by a landscape organized by the Tigris and Euphrates rivers and their system of canals, as well as by marshes. We study Lower Iraqi society, taking into account its religious and social diversity. Particular focus is given to the relationship of this land-related society with the state in the 2nd/8th century, a period during which two dynasties followed one another, the Umayyads until 132/750 and then the Abbasids. This change of power for the land history of the region is then questioned. Based on a literary corpus, composed largely of later narrative historical sources and normative sources, especially concerning fiscal jurisprudence, we suggest a history that takes into consideration literary forms and the socio-economic aspect. This work on the writing of history and law allows us to propose a twofold portrait of the landed society in Lower-Iraq in the 2nd/8th century: both the one presented by the sources and the one that goes beyond their historiographical project. Of particular interest is the analysis of the historical process of the formation of the state. We show how power acts in the land of Lower-Iraq, while at the same time having to cope with the “people of the land” in order to do so. We therefore examine how the region is governed, with a particular focus on the fiscal issue and land ownership. We focus on the actors (administrators, owners, peasants) and the processes: the modalities of land acquisition (inheritance, purchase, grants, revivification), land conflicts, and the exploitation of estates. The power of land in Lower Iraq in the 2nd/8th century is demonstrated by the capacity of people to defend themselves and to act on the power of the state over their land
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Dommaraju, Sunny Raj. "Design and Implementation of a 16-Bit Flexible ROM-less Direct Digital Synthesizer in FPGA and CMOS 90nm Technology." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1374351629.
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Doganata, Zinnur. "General structural representations for multi-input multi-output discrete-time FIR and IIR lossless systems." Thesis, 1990. https://thesis.library.caltech.edu/711/1/Doganata_z_1990.pdf.
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Discrete-time lossless systems have been found to be of great importance in many signal processing applications. However, a representation for lossless transfer matrices that spans all such matrices with the smallest possible number of parameters has not been proposed earlier. Existing representations are usually for special cases and therefore not general enough. In this study, two general and minimal representations are presented for multi-input, multi-output FIR and IIR lossless systems. The first representation is in terms of planar rotations and it leads to multi-input, multi-output lattice structures. The second representation is in terms of unit-norm vectors and it enables shorter convergence times in optimization applications. A simple modification of this representation leads to structures that remain lossless under quantization. The structures that follow from these representations share some properties such as the orthogonality of the implementations, and minimality of the number of parameters and scalar delays they are. Since all lossless transfer matrices can be spanned by appropriately adjusting their parameters, these structures can be particularly useful in applications that involve optimization under the constraint of losslessness. Some examples of such applications are included.
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"Simulación de Filtos FIR e IIR en VHDL." Tesis, Universidad de las Américas Puebla, 2005. http://catarina.udlap.mx/u_dl_a/tales/documentos/lep/vargas_f_cd/.
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Liao, Wen Yuan, and 廖文淵. "Design of discrete coefficient FIR and IIR digital Filters." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/24407580375330851011.
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Wu, Mau-Lin, and 吳茂霖. "FIR and IIR Digital Filter Design by Remez Exchange Algorithm." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/62216325405190209169.
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碩士國立臺灣大學
電機工程研究所
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There are many algorithms for designing digital FIR and IIR filters. Among them, Remez exchange algorithm and the second Remez exchange algorithm are the most efficient methods for designing optimal digital filters. The characteristics of this algorithm are fast convergent speed, low computation complexity and with fast computation algorithm. Remez exchange algorithm has been famous for its application to design of optimal linear- phase FIR filter and we extend its application to designs of log FIR and log IIR filters, IIR filter and Complex FIR filter. The difficulty encountered in the algorithm is that the approximation equations are nonlinear equations but not traditional linear ones. It requires some linearization technique for solving the filter's coefficients in the approximation equations. We solve this problem by taking the Taylor's expansion in this paper. Some examples are proposed to prove that this method is very efficient. There had been many methods applied to design FIR and IIR filters similar to this paper. Several examples are illustrated for comparisons with other algorithms and it is recognized that the proposed algorithm in this paper is better than others.
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徐忠技. "Eigenfilter Approach to the Design of FIR and IIR Digital Filters." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/49459139523041498591.
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