Dissertations / Theses: 'Oscillations in digital filters'

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Mackle, John. "Integrated digital filters." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334588.

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Hicks, William T. "MEDIAN FILTERS." International Foundation for Telemetering, 2006. http://hdl.handle.net/10150/604155.

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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, California
Most modern digital filtering is done by taking the average (mean) of a signal or some weighted average. Another method is to use feedback, which more closely resembles how analog filters with feedback operate. In the case of low pass filters, all these methods tend to give a trade off in getting the signal to pass while attenuating the higher frequency noise. An alternative is to use a median filter, which selects the mid value of a group of points. While this is not as computationally simple as other filters, it allows for the attenuation of noise while allowing sudden changes in signal level to pass thru unaltered. This paper discusses the characteristics of median filters and methods of implementing them.

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Karlsson, Magnus. "Implementation of digital-serial filters /." Linköping : Dept. of Electrical Engineering, Univ, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-3520.

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Walls, Kirsty. "Nanophotonic filters for digital imaging." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4514/.

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There has been an increasing demand for low cost, portable CMOS image sensors because of increased integration, and new applications in the automotive, mobile communication and medical industries, amongst others. Colour reproduction remains imperfect in conventional digital image sensors, due to the limitations of the dye-based filters. Further improvement is required if the full potential of digital imaging is to be realised. In alternative systems, where accurate colour reproduction is a priority, existing equipment is too bulky for anything but specialist use. In this work both these issues are addressed by exploiting nanophotonic techniques to create enhanced trichromatic filters, and multispectral filters, all of which can be fabricated on-chip, i.e. integrated into a conventional digital image sensor, to create compact, low cost, mass produceable imaging systems with accurate colour reproduction. The trichromatic filters are based on plasmonic structures. They exploit the excitation of surface plasmon resonances in arrays of subwavelength holes in metal films to filter light. The currently-known analytical expressions are inadequate for optimising all relevant parameters of a plasmonic structure. In order to obtain arbitrary filter characteristics, an automated design procedure was developed that integrated a genetic algorithm and 3D finite-difference time-domain tool. The optimisation procedure's efficacy is demonstrated by designing a set of plasmonic filters that replicate the CIE (1931) colour matching functions, which themselves mimic the human eye's daytime colour response. The best designs were fabricated and demonstrated a least-mean-square error, in comparison to the desired colour matching functions, of 6.37*10^3, 2.34*10^3 and 11.10*10^3 for the red, green, and blue filters respectively. Notably the spectrum for the red filter contained a double peak, as present in the corresponding colour matching function. Such dual peak behaviour cannot be achieved using a single current dye-based filter. The filters retain the same layer thickness for all structures so they can be defined in a single lithography step. A new approach to enable the fabrication of a multispectral filter array on a CMOS imager is also presented. This combines a Fabry-Perot filter with effective medium theory (EMT) to enable the fabrication of multiple filters in a single cavity length via lithographic tuning of the filter passband. Two approaches are proposed; air-filled nanostructures and dielectric backfilled nanostructures. The air-filled approach is demonstrated experimentally producing three filters with FWHM of 60 - 64 nm. Using the backfilled design, and incorporating a highindex cavity material, a set of twenty three narrowband filters, with a FWHM of 22 - 46nm is demonstrated. A virtual image reproduction process was developed to quantify the image reproduction performance of both the plasmonic and Fabry-Perot filter sets. A typical rgb dye-based filter set used in conventional imagers achieves a mean colour error of 2.711, whereas the experimental data from the plasmonic filters achieves an error of 2.222 which demonstrated a slight improvement in colour reproduction. The multispectral filter set developed in this work performed even better, with 4 filters giving an error of 0.906, 10 filters an error of 0.072 and continued improvement in the colour error reaching 0.047 for 23 filters. All the filter sets proposed are fully compatible with the CMOS process so as to enable direct integration onto CMOS image sensors in industrial foundries in future. The performance of the presented filters also suggest new compact applications in art reproduction, agricultural monitoring and medical imaging.

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El-Feghi, Idris S. "Design of three-dimensional digital filters." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0013/MQ52542.pdf.

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Gustafsson, Oscar. "Contributions to low-complexity digital filters /." Linköping : Univ, 2003. http://www.bibl.liu.se/liupubl/disp/disp2003/tek837s.pdf.

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Bolton, Alan Graham. "Digital filters and cascade control compensators /." Title page, contents and abstract only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phb694.pdf.

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8

詹文達 and Man-tat Jimmy Tsim. "High speed realisation of digital filters." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31208939.

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Okullo-Oballa, Thomas Samuel. "Systolic realization of multirate digital filters." Thesis, [Hong Kong] : University of Hong Kong, 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12433998.

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Tsim, Man-tat Jimmy. "High speed realisation of digital filters /." [Hong Kong] : University of Hong Kong, 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12374088.

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Volkova, Anastasia. "Towards reliable implementation of digital filters." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066579/document.

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Dans cette thèse nous essayons d'améliorer l'évaluation de filtres numériques en nous concentrant sur la précision de calcul nécessaire.Ce travail est réalisé dans le contexte d'un générateur de code matériel/logiciel fiable pour des filtres numériques linéaires, en particulier filtres à Réponse Impulsionnelle Infinie (IIR). Avec ce travail, nous mettons en avant les problèmes liés à l'implémentation de filtres linéaires en arithmétique Virgule Fixe tout en prenant en compte la précision finie des calculs nécessaires à la transformation de filtres vers code. Ce point est important dans le cadre de filtres utilisés dans des systèmes embarqués critique comme les véhicules autonomes. Nous fournissons une nouvelle méthodologie pour l'analyse d'erreur lors de l'étude d'algorithmes de filtres linéaires du point de vue de l'arithmétique des ordinateurs. Au cœur de cette méthodologie se trouve le calcul fiable de la mesure Worst Case Peak Gain d'un filtre qui est la norme l1 de sa réponse impulsionnelle. L'analyse d'erreur proposée est basée sur la combinaison de techniques telles que l'analyse d'erreur en Virgule Flottante, l'arithmétique d'intervalles et les implémentations multi-précisions. Cette thèse expose également la problématique de compromis entre les coûts matériel (e.g. la surface) et la précision de calcul lors de l'implémentation de filtres numériques sur FPGA. Nous fournissons des briques de bases algorithmiques pour une solution automatique de ce problème. Finalement, nous intégrons nos approches dans un générateur de code pour les filtres au code open-source afin de permettre l'implémentation automatique et fiable de tout algorithme de filtre linéaire numérique
In this thesis we develop approaches for improvement of the numerical behavior of digital filters with focus on the impact of accuracy of the computations. This work is done in the context of a reliable hardware/software code generator for Linear Time-Invariant (LTI) digital filters, in particular with Infinite Impulse Response (IIR). With this work we consider problems related to the implementation of LTI filters in Fixed-Point arithmetic while taking into account finite precision of the computations necessary for the transformation from filter to code. This point is important in the context of filters used in embedded critical systems such as autonomous vehicles. We provide a new methodology for the error analysis when linear filter algorithms are investigated from a computer arithmetic aspect. In the heart of this methodology lies the reliable evaluation of the Worst-Case Peak Gain measure of a filter, which is the l1 norm of its impulse response. The proposed error analysis is based on a combination of techniques such as rigorous Floating-Point error analysis, interval arithmetic and multiple precision implementations. This thesis also investigates the problematic of compromise between hardware cost (e.g. area) and the precision of computations during the implementation on FPGA. We provide basic brick algorithms for an automatic solution of this problem. Finally, we integrate our approaches into an open-source unifying framework to enable automatic and reliable implementation of any LTI digital filter algorithm

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Gottscheber, Achim. "Multi-dimensional wave digital filters and wavelets." [S.l. : s.n.], 1998. http://deposit.ddb.de/cgi-bin/dokserv?idn=958171483.

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Kumar, Bhunesh, and Naeem Ahmad. "Studies on Circulator-Tree Wave Digital Filters." Thesis, Linköping University, Department of Electrical Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-51295.

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A wave digital filter is derived from an analog filter, which is realized as classical doubly resistively terminated reactancefilters. Perfectly designed wave digital filters express good dynamic signal range, low roundoff noise and excellent stabilitycharacteristics with respect to nonlinearity which are produced due to finite wordlength effects. Wave digital filters inheritthe sensitivity properties from analog filters, therefore, coefficients values can be selected to favorable values.Wave digital filters, derived from ladder filters, have low coefficient sensitivity in the passband and stopband. These WDFsare very complicated and are non-modular. The lattice wave digital filters are modular and are not complex. However, theyhave very high sensitivity in the stopband and thus require large coefficient wordlengths. The number of coefficients equalsthe filter order which have to be odd.This thesis discusses the wave digital filter structures that are modular because they are designed by cascading the first-orderand second-order sections. These WDFs can be pipelined. They also exhibit all the above mentioned favorable properties.Similar to lattice WDFs, these structures are restricted to symmetrical and antisymmetrical transfer functions. The synthesisof these structures is based on the factorization of the scattering matrix of lossless two-ports.In this thesis work, lowpass wave digital filters based on circulator-tree structure are designed with different orders startingfrom 3 and going upto 13. In parallel to these circulator-tree wave digital filters, the simple digital filters are also designedwith the same specification. The results of the two filters are compared with each other. It is observed that impulse responseand attenuation response of the two kind of filters perfectly match. Therefore, it is can be concluded that circulator-tree WDFupto Nth order can be synthesized. The implementation examples of two filter with order 3 and order 7 is presented in thisdocumentation for ready reference. It has also been shown that the order of sections does not affect the transfer function ofthe filter. Noise has been introduced and adaptor sections are penetrated. From the results it is concluded that the order of theadaptor sections does not matter and also that the noise does not affect the other adaptors sections, it only propagates throughother adaptors sections.

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Tam, Shedman. "Suppression of limit cycles in digital filters." Thesis, University of Ottawa (Canada), 1987. http://hdl.handle.net/10393/5103.

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McFadden, Steven B. "Multimedia applications of three-dimensional digital filters." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0030/MQ65382.pdf.

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Rolls, Andrew John. "Theory and applications of digital smear filters." Thesis, University of Canterbury. Electrical and Electronic Engineering, 1994. http://hdl.handle.net/10092/5865.

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This thesis investigates the theory and applications of digital smear filters. A smear filter can be defined as a device that disperses the energy contained in a wide bandwidth pulse in time. A desmear filter performs the inverse operation to the smear filter by compressing the smeared pulse in time. The first part of this thesis, consisting of chapters 2-4, presents a theoretical basis for digital smear filters and develops three methods for designing these filters. One of these methods is an extension of the window method used to design linear phase FIR filters; another is an extension to the frequency sampling method; the third design method has no linear phase FIR filter counterpart, and we have called it the iterative Wiener method. The second part of this thesis, consisting of chapters 5-8, investigates novel applications for these smear/desmear filters. These applications include using smear/desmear filters to: • Compress the dynamic range of speech. (A 3-4 dB reduction in the peak-to-rms ratio can be achieved.) • Destroy the dependence between a signal and its quantization noise. (Smear filters can increase both the subjective quality and the intelligibility of hard limited speech.) • Encode data for transmission over a noisy channel in order to protect the data from bit errors. (A novel method for channel coding that uses smear filters is described, and the principles of this method are substantiated.) • Scramble a signal for privacy. (Smeared speech signals can be made unintelligible for delays as short as 400 ms.) Although smear/desmear filters are shown to be extremely versatile devices, they have one serious drawback: They introduce delay. Some of the applications described above require very long delays to approach their theoretical bounds of performance.

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Musonda, Evaristo. "Synthesis of filters for digital wireless communications." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/11750/.

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Firstly, a new synthesis method for the generation of the generalized Chebyshev characteristic polynomials has been presented. The general characteristic function is generated by a linear combination of Chebyshev basis characteristic functions. The basis functions for different filtering functions may easily be determined based on the number and position of reflection and transmission zeros. These basis functions enable direct synthesis of both lumped and distributed filter networks. Different filter functions including but not limited to low-pass, bandpass and dual bandpass filters, have been synthesised to demonstrate the general application of the synthesis method. Secondly, a new method for the design of a new class of distributed low-pass filter has been presented that enables exact realisation of the series short circuited transmission lines which are normally approximated via unit elements in other filter realisations. The filters are based on parallel coupled high impedance transmission lines which are terminated at one end in open-circuited stubs. The approach enables realisation of both finite and quarter-wave frequency transmission zeros hence giving improved stopband performance. A complete design is presented and the fabricated low-pass filter demonstrates excellent performance in good agreement with theory. Finally, design techniques for microwave bandpass filters using re-entrant resonators are presented. The key feature is that each re-entrant resonator in the filter generates a passband resonance and a finite frequency transmission zero, above the passband. Thus an Nth degree filter can have N finite frequency transmission zeros with a simple physical realization. A new synthesis technique for pseudo-elliptic low-pass filters suitable for designing re-entrant bandpass filter has also been show-cased. A physically symmetrical 5 pole re-entrant bandpass prototype filter with 5 transmission zeros above the passband was designed and fabricated. Measured results showed good correspondence with theories.

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Swarnakar, Vivek. "Optimal morphological filters /." Online version of thesis, 1993. http://hdl.handle.net/1850/11703.

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Saab, Sami James. "Design of digital filters for low-power digital signal processing applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0001/MQ41376.pdf.

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梁鴻鈞 and Hung-kwan Leung. "Multi-rank wavelet filters." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31224714.

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Leung, Hung-kwan. "Multi-rank wavelet filters." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23242395.

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Rosenthal, Jordan. "Filters and filterbanks for hexagonally sampled signals." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/13347.

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Orcutt, Edward Kerry 1964. "Correlation filters for time domain signal processing." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277215.

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This study proposes employing new filters in various configurations for use in digital communication systems. We believe that significant improvements in such performance areas as transmission rate and synchronization may be achieved by incorporating these filters into digital communications receivers. Recently reported in the literature, these filters may offer advantages over the matched filter which allow enhancements in data rates, ISI tolerance, and synchronization. To make full use of the benefits of these filters, we introduce the concept of parallel signal transmission over a single channel. We also examine the effects of signal set selection and noise on performance.

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Sadeghifar, Mohammad Reza. "On High-Speed Digital-to-Analog Converters and Semi-Digital FIR Filters." Licentiate thesis, Linköpings universitet, Elektroniska Kretsar och System, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-114274.

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High-speed and high-resolution digital-to-analog converters (DACs) are vital components in all telecommunication systems. Radio-frequency digital-to-analog converter (RFDAC) provides high-speed and high-resolution conversion from digital domain to an analog signal. RFDACs can be employed in direct-conversion radio transmitter architectures. The idea of RFDAC is to utilize an oscillatory pulse-amplitude modulation instead of the conventional zero-order hold pulse amplitude modulation, which results in DAC output spectrum to have high energy high-frequency lobe, other than the Nyquist main lobe. The frequency of the oscillatory pulse can be chosen, with respect to the sample frequency, such that the aliasing images of the signal at integer multiples of the sample frequency are landed in the high-energy high-frequency lobes of the DAC frequency response. Therefore the high-frequency images of the signal can be used as the output of the DAC, i.e., no need to the mixing stage for frequency up-conversion after the DAC in the radio transmitter. The mixing stage however is not eliminated but it is rather moved into the DAC elements and therefore the local oscillator (LO) signal with high frequency should be delivered to each individual DAC element. In direct-conversion architecture of IQ modulators which utilize the RFDAC technique, however, there is a problem of finite image rejection. The origin of this problem is the different polarity of the spectral response of the oscillatory pulse-amplitude modulation in I and Q branches. The conditions where this problem can be alleviated in IQ modulator employing RFDACs is also discussed in this work. ΣΔ modulators are used preceding the DAC in the transmitter chain to reduce the digital signal’s number of bits, still maintain the same resolution. By utilizing the ΣΔ modulator now the total number of DAC elements has decreased and therefore the delivery of the high-frequency LO signal to each DAC element is practical. One of the costs of employing ΣΔ modulator, however, is a higher quantization noise power at the output of the DAC. The quantization noise is ideally spectrally shaped to out-of-band frequencies by the ΣΔ modulator. The shaped noise which usually has comparatively high power must be filtered out to fulfill the radio transmission spectral mask requirement. Semi-digital FIR filter can be used in the context of digital-to-analog conversion, cascaded with ΣΔ modulator to filter the out-of-band noise by the modulator. In the same time it converts the signal from digital domain to an analog quantity. In general case, we can have a multi-bit, semi-digital FIR filter where each tap of the filter is realized with a sub-DAC of M bits. The delay elements are also realized with M-bit shift registers. If the output of the modulator is given by a single bit, the semi-digital FIR filter taps are simply controlled by a single switch assuming a current-steering architecture DAC. One of the major advantages is that the static linearity of the DAC is optimum. Since there are only two output levels available in the DAC, the static transfer function, regardless of the mismatch errors, is always given by a straight line. In this work, the design of SDFIR filter is done through an optimization procedure where the ΣΔ noise transfer function is also taken into account. Different constraints are defined for different applications in formulation of the SDFIR optimization problem. For a given radio transmitter application the objective function can be defined as, e.g., the hardware cost for SDFIR implementation while the constraint can be set to fulfill the radio transmitter spectral emission mask.

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Landernäs, Krister. "Implementation of digital-serial LDI/LDD allpass filters." Doctoral thesis, Mälardalen University, Department of Computer Science and Electronics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-155.

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In this thesis, digit-serial implementation of recursive digital filters is considered. The theories presented can be applied to any recursive digital filter, and in this thesis we study the lossless discrete integrator (LDI) allpass filter. A brief introduction regarding suppression of limit cycles at finite wordlength conditions is given, and an extended stability region, where the second-order LDI allpass filter is free from quantization limit cycles, is presented.

The realization of digit-serial processing elements, i.e., digit-serial adders and multipliers, is studied. A new digit-serial hybrid adder (DSHA) is presented. The adder can be pipelined to the bit level with a short arithmetic critical path, which makes it well suited when implementing high-throughput recursive digital filters.

Two digit-serial multipliers which can be pipelined to the bit level are considered. It is concluded that a digit-serial/parallelmultiplier based on shift-accumulation(DSAAM) is a good candidate when implementing recursive digital systems, mainly due to low latency. Furthermore, our study shows that low latency will lead to higher throughput and lower power consumption.

Scheduling of recursive digit-serial algorithms is studied. It is concluded that implementation issues such as latency and arithmetic critical path are usually required before scheduling considerations can be made. Cyclic scheduling using digit-serial arithmetics is also considered. It is shown that digit-serial cyclic scheduling is very attractive for high-throughput implementations.

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Hezar, Rahmi. "Oversampled digital filters : a design methodology and implementation." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/14936.

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Wróblewski, Artur [Verfasser]. "Design of Low Power Digital Filters / Artur Wróblewski." Aachen : Shaker, 2005. http://d-nb.info/1181615852/34.

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Baguma, Gerald. "High Level Synthesis of FPGA-Based Digital Filters." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-232414.

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This thesis work is aimed at the high level synthesis of FPGA based IIR digital filters using Vivado HLS produced by Xilinx and HDL coder produced by MathWorks. The Higher Layer Model of the filter was designed in Vivado HLS, MATLAB and Simulink. Simulations, verification and Synthesis of the RTL code was done for both tools. Further optimizations were done so that the final design could meet the area, timing and throughput requirements. The resulting designs were later evaluated to see which of them satisfies the design objectives specified. This thesis work has revealed that Vivado HLS is able to generate more efficient designs than the HDL coder. Vivado provides the designer with more granularity to control scheduling and binding, the two processes at the heart of HLS. In addition, both tools provide the designer with transparency from modeling up to verification of the RTL code. HDL coder did not meet timing. Vivado HLS on the other hand met the timing requirements. The limitations of each design flow are also discussed in this report. A review of the tools available on the market today was also done and recommendations about them made. Finally, this thesis work recommends that ABB HVDC should adopt the HLS methodology using Vivado in order to achieve accelerated development. More work should be done to evaluate the possibility of auto C/C++ code generation for RTL synthesis in Vivado. Lastly, an evaluation on the LabVIEW environment should be done as an alternative to the HLS methodology.

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Rich, Thomas H. "Algorithms for computer aided design of digital filters." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/22867.

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Samad, Salina Abdul. "Link-transmission-line modelling of wave digital filters." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260520.

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Demirsoy, SuÌˆleyman SÄ±rrÄ±. "Complexity reduction in digital filters and filter banks." Thesis, University of Westminster, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433680.

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Matharu, P. S. "Architectures for the VLSI implementation of digital filters." Thesis, City University London, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382819.

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Sundaralingam, Sathiaseelan. "Evolving optimal IIR and adaptive filters." Thesis, University of Glasgow, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300977.

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Schipman, Kurt. "Control systems and algorithms for active filters." Thesis, Staffordshire University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360218.

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Price, Marc Royston. "Hybrid structures for high order recursive filters." Thesis, King's College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339120.

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Kennedy, Paul B. (Paul Brodie). "Filter designer : an intuitive digital filter design environment." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23849.

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The ability to accurately manipulate the spectral content of audio is indispensable for the artistic presentation of sound. While there are many devices currently available that are capable of performing this function, most tend to be either highly complex electrical engineering tools, or music-oriented products that are limited in functionality. Filter Designer was created to fill this gap by providing an environment with which musically-trained users can design and implement digital filters, while having access to control parameters and analysis data previously exclusive to the engineering field. This work explores the factors that motivated the creation of Filter Designer, and examines the process of its development, from basic user interface design to the calculation and implementation of digital filters for use with audio signals.

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Lertniphonphun, Worayot. "Unified design procedure for digital filters in the complex domain." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/14765.

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Hicks, William T. "An Analysis of Various Digital Filter Types for Use as Matched Pre-Sample Filters in Data Encoders." International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/611585.

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International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, Nevada
The need for precise gain and phase matching in multi-channel data sampling systems can result in very strict design requirements for presample or anti-aliasing filters. The traditional use of active RC-type filters is expensive, especially when performance requirements are tight and when operation over a wide environmental temperature range is required. New Digital Signal Processing (DSP) techniques have provided an opportunity for cost reduction and/or performance improvements in these types of applications. This paper summarizes the results of an evaluation of various digital filter types used as matched presample filters in data sampling systems.

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Kwan, Wai Ming Hercule. "Parallel implementation of a fast third-order volterra digital filter /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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Law, Ying Man. "Iterative algorithms for the constrained design of filters and filter banks /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202004%20LAW.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 108-111). Also available in electronic version. Access restricted to campus users.

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Cederström, Love. "Power Efficient Digital Decimation Filters for Sigma-Delta ADCs." Thesis, Linköping University, Department of Electrical Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-51464.

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The development of integrated circuit technology seen in the last decades has enabled a large variety of battery operated equipment to emerge, such as smallsensors and medical implants. These applications often has low requirements on sampling frequency but require a very low power consumption to achieve a longbattery life.

This thesis investigates one aspect of implementing a low power and low frequency analog to digital converter (ADC) using a technique called Sigma Delta-modulation.The Sigma Delta-ADC uses few analog components but instead it requires a digital filter to extract the wanted resolution. It is this filter which is under investigation in this work.

To investigate the power consumption under the presumption that the filter would be a custom circuit implemented on-chip, a simplistic approach has been taken. Based on a high-level algorithmic investigation and the fact that it is popularly used together with Sigma Delta-modulators the Cascaded Integrator Comb (CIC) filter was chosen for implementation.

The CIC-filter uses only adders and delay elements which is a great advantage when aiming at a low power consumption. The drawback is that this filter has a poor passband which can introduce distortion within the signal band. Using the Spectre simulator provided in the Cadence Virtuoso suite the lowest power consumption achieved was 16 nW, extracting 80 % of the theoretically available resolution.

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42

Critchley, J. "Analysis and design of periodically time varying digital filters." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383172.

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43

Cao, Letian, and Yuankai Guan. "Use of digital filters based on Labview and Matlab." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-45703.

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44

Chit, Nassim N. "Weighted Chebyshev complex-valued approximation for FIR digital filters." Thesis, Swansea University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278340.

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45

Turek, Daniel B. (Daniel Bernard) 1980. "Design of efficient digital interpolation filters for integer upsampling." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/18010.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.
Includes bibliographical references (leaf 44).
Digital signal interpolation systems can be implemented in a variety of ways. The most basic interpolation system for integer upsampling cascades an expander unit with an interpolation low-pass filter. More complex implementations can cascade multiple expander and low-pass filter pairs. There is also flexibility in the design of interpolation filters. This thesis explores how digital interpolation systems for integer upsampling can be efficiently implemented. Efficiency is measured in terms of the number of multiplications required for each output sample point. The following factors are studied for their effect on system efficiency: the decomposition of an interpolation system into multiple cascaded stages, the use of recursive and non-recursive interpolation filters, and the use of linear-phase and minimum-phase interpolation filters. In this thesis interpolation systems are designed to test these factors, and their computational costs are calculated. From this data, conclusions are drawn about efficient designs of interpolation systems for integer upsampling.
by Daniel B. Turek.
M.Eng.

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46

Dalbom, Axel, Markuss Sprogis, Emil Stolpe, and Nils Söderkvist. "A Tool for Learning Digital Filters in Virtual Reality." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-353852.

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There are various tools used for teaching purposes, be it computers or even pen and paper. Virtual reality is used to simulate immersive environments. While it is mostly used in the video game industry we have made an attempt to use it as a learning tool, in this case for courses related to signal processing by trying to build intuition for digital filter design. The end product is a tool in virtual reality that allows the user to alter digital filter specifications and see how these alterations affect it. With this project we show that there is potential for virtual reality to be used as a teaching assistant. The main drawbacks for tool creation in virtual reality are that there is a limited amount of frameworks that support virtual reality and that they are mainly created for video game development.
Det finns många olika verktyg för lärande ändamål, det kan bland annat vara datorer eller penna och papper. Virtuell verklighet är ett verktyg för att skapa datorgenererade miljöer. Det används mestadels inom spelindustrin men vi i det här projektet försöker utöka användningsområdet för virtuell verklighet inom utbildning, i detta fall för kurser relaterade till signalbehandling genom att hjälpa användare att bygga intuition för designen av digitala filter. Slutprodukten är ett hjälpmedel i virtuell verklighet som tillåter användaren att skapa och ändra digitala filters specifikationer och sedan se vad dessa förändringar har för konsekvenser för filtren. Med det här projektet visar vi att det finns potential för virtuell verklighet i lärande ändamål, även om det huvudsakliga användingsområdet är inom spelindustrin.

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47

Jones, Andrew Philip Stephen. "Design and implementation of linear phase wave digital filters." Thesis, University of Warwick, 1992. http://wrap.warwick.ac.uk/110793/.

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A steady increase of research within the field of digital systems has resulted ip a wide acceptance of the discrete approach to system design. Research has produced discrete techniques that complement those already in use in the analogue domain. A rapid improvement in the performance and availability of digital hardware has prompted a move from analogue to digital systems, especially within the field of signal processing. This thesis considers the design of Wave Digital Filters (WDF's) to satisfy arbitrary magnitude and phase specifications with finite word length coefficients. It describes the structures and properties of ladder and lattice WDF's related to linear phase design through coefficient sensitivity and non-minimum-phase. The initial part of this thesis concentrates upon the design and comparison of optimization techniques to satisfy magnitude-only and simultaneous low-pass frequency specifications upon ladder and lattice WDF's. Experiments confirm the unsuitability of the ladder WDF for simultaneous designs because of their minimum-phase characteristics. Successful simultaneous low pass designs upon lattice WDF's were achieved through quasi-Newton algorithms using a dual line template scheme and a weighted Lp-metric error function. The All Pass Sections(APS's) used to construct the low pass lattice WDF were investigated and a range of APS's considered that would allow the lattice WDF structure to satisfy high pass, single band pass and dual band pass frequency specifications. Special case APS's for single and dual band pass designs were generated by applying frequency transformations to the 1st and 2nd order low pass APS's. Equations and characteristics for these APS's are detailed along with a number of examples of filter deigns. The final area of this thesis concerns the design of finite word length solutions to magnitude-only and simultaneous frequency specifications, ranging from low pass to dual band pass type responses. Using the large word length solutions generated through the quasi-Newton optimization techniques as starting coefficients, a Hookc-Jceves direct search algorithm was implemented to generate finite word length solutions. Techniques detailed in this thesis provide a method for the generation of finite word length coefficients that satisfy arbitrary magnitude-only and simultaneous frequency specifications through optimization for the lattice WDF's.

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48

Karam, Lina J. "Design of complex digital FIR filters in the chebyshev sense." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/22219.

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49

Bews, R. "Digital crossover networks for active loudspeaker systems." Thesis, University of Essex, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383428.

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50

Ohlsson, Henrik. "Studies on Design and Implementation of Low-Complexity Digital Filters." Doctoral thesis, Linköping : Dept. of Electrical Engineering, Univ, 2005. http://www.ep.liu.se/diss/science_technology/09/49/index.html.

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Dissertations / Theses on the topic 'Oscillations in digital filters'

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