Дисертації з теми "Modélisation du signal"
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Ridley, Raymond Bryan. "A new small-signal model for current-mode control." access full-text online access from Digital dissertation consortium, 1990. http://libweb.cityu.edu.hk/cgi-bin/er/db/ddcdiss.pl?9116643.
Повний текст джерелаRidley, Raymond B. "A new small-signal model for current-mode control." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-07282008-135124/.
Повний текст джерелаTaillefer, Christopher. "Analog-to-digital conversion via time-mode signal processing." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18669.
Повний текст джерелаLes convertisseurs conventionnels pour changer la tension analogique à une tension numérique emploient les amplificateurs de tension, les comparateurs de tension, et les résaux de condensateur sélectionable pour acquir leur traitement de signal. En comparaison le circuit des modules analogues vis-à-vis le circuit numérique nous constatons une augmentation de puissance, une superficie de silicium moins compacte, et un traitement de données beaucoup plus lent. Une méthodologie est proposée pour le traitement du signal qui établi la conversion analogue à numérique sur les signaux de tension et tout en mettant en oeuvre tous les circuits dans un format numérique de type circuit à semiconducteur oxyde-métal à symétrie complémentaire (CMOS). Cette méthodologie reconnue sur le nom de technique-temporelle donne un traitement de signal par domaine temporel en employant la variance de cadence entre les temps comme un signal intermédiare entre la tension d'entrée et la tension de sortie numérique. Les formats numériques de type circuit semiconducteur nous offrent une alternative en temps convertisseur d'analogue à numérique avec l'avantage d'une unité compact, robuste, un coût de puissance réduit, et une haute-vitesse efficace. Il existe cinq topologies principales dans les convertisseurs analogiques à numérique: flash, approximations successives, pipeline, delta-sigma, convertisseurs intégrés. Dans chacune des topologies mentionnées ci-dessus, le traitement de signal par technique-temporelle est une méthode réconnue. Les circuits employés par chaque convertisseur de donnée par technique temporelle sont décrits lorsque le niveau du système est approprié, le niveau du transitor, et les données expérimentales sont identifiés. Trois circuits intégrés (CI) ont été conçus et fabriqués, avec une technologie de 0,18-µm CMOS pour démontrer la possibilité de la méthodologie du techniquetemporelle convertisseur analogique-numéri
Guttman, Michael. "Sampled-data IIR filtering via time-mode signal processing." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86770.
Повний текст джерелаDans ce mémoire, la conception de filtres de données-échantillonnées ayant une réponse impulsionnelle infinie basée sur le traitement de signal en mode temporel est présentée. Le traitement de signal dans le domaine temporel (TSDT), définie comme étant le traitement d'information analogique échantillonnée en utilisant des différences de temps comme variables, est devenu une des techniques émergentes de conception de circuits des plus populaires. Puisque le TSDT est toujours relativement récent, il y a encore beaucoup de développements requis pour étendre cette technologie comme un outil de traitement de signal général. Dans cette recherche, un ensemble de blocs d'assemblage capable de réaliser la plupart des opérations mathématiques dans le domaine temporel sera introduit. En arrangeant ces structures élémentaires, des systèmes en mode temporel d'ordre élevé, plus spécifiquement des filtres en mode temporel, seront réalisés. Trois filtres de deuxième ordre dans le domaine temporel (passe-bas, passe-bande et passe-haut) sont modélisés sur MATLAB et simulé sur Spectre afin de vérifier la méthodologie de conception. Finalement, un intégrateur amorti et un filtre passe-bas IIR de deuxième ordre en mode temporel sont implémentés avec des composantes discrètes.
Tirunagari, Santosh. "Dynamic mode decomposition for computer vision and signal processing." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/813255/.
Повний текст джерелаBhattaram, Sneha. "Signal Compression Methods for a Wear Debris Sensor." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1399201029.
Повний текст джерелаAli-Bakhshian, Mohammad. "Digital processing of analog information adopting time-mode signal processing." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114237.
Повний текст джерелаLes technologies CMOS progressant vers les procédés 22 nm et au delà, la abrication des circuits analogiques dans ces technologies se heurte a de nombreuses limitations. Entre autres limitations on peut citer la réduction d'amplitude des signaux, la sensibilité aux effets du bruit thermique et la perte de fonctions précises de commutation. Le traitement de signal en mode temps (TMSP pour Time-Mode Signal Processing) est une technique que l'on croit être bien adapté pour résoudre un grand nombre de problèmes relatifs a ces limitations. TMSP peut être défini comme la détection, le stockage et la manipulation de l'information analogique échantillonnée en utilisant des quantités de temps comme variables. L'un des avantages importants de TMSP est la capacité à réaliser des fonctions analogiques en utilisant des structures logiques digitales. Cette technique a une longue histoire en terme d'application en électronique. Cependant, en raison du manque de certaines fonctions fondamentales, l'utilisation de variables en mode temps a été limitée à une utilisation comme étape intermédiaire dans le traitement d'un signal et toujours dans le contexte d'une conversion tension/courant-temps et temps-tension/courant. Ces conversions nécessitent l'inclusion de blocs analogiques qui vont a l'encontre de l'avantage numérique des TMSP. Cette thèse fournit un fondement approprié pour le développement de TMSP comme outil général de traitement de signal. En proposant le concept nouveau d'interruption de retard, une toute nouvelle approche asynchrone pour la manipulation de variables en mode temps est suggéré. Comme conséquence directe de cette approche, des techniques pratiques pour le stockage, l'addition et la soustraction de variables en mode temps sont présentées. Pour étendre l'implémentation digitale de TMSP à une large gamme d'applications, la conception d'un intégrateur (accumulateur) à double voie temps- à -temps est démontrée. cet intégrateur est ensuite utilisé pour implémenter un modulateur delta-sigma de second ordre.Enfin, pour démontrer l'avantage de TMSP, une Interface de très basse puissance, compacte et réglable pour capteurs capacitifs est présenté. Cette interface est composé d'un certain nombre de blocs de retard associés à des portes logiques typiques. Toutes les théories proposées sont soutenues par des résultats expérimentaux et des simulations post-layout. L'implémentation digitale des circuits proposés a été la première priorité de cette thèse. En effet, une implémentation des bloc avec des structures digitales permet des conceptions simples, synthétisable et reconfigurables où des circuits de calibration très abordables peuvent être adoptées pour éliminer les effets des variations de process.
Bi, G. "Application of mode controlled logic to pipelined serial signal processing]." Thesis, University of Essex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381239.
Повний текст джерелаBergogne, Christian. "Transmission en mode paquet à faible rapport signal à bruit /." Paris : École nationale supérieure des télécommunications, 1997. http://catalogue.bnf.fr/ark:/12148/cb36165913n.
Повний текст джерелаHolzner, Jürgen. "Signal theory and processing for Burst-mode and ScanSAR interferometry." Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/23054.
Повний текст джерелаBai, Neng. "Mode-Division Multiplexed Transmission in Few-mode Fibers." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5761.
Повний текст джерелаPh.D.
Doctorate
Optics and Photonics
Optics and Photonics
Optics
Deng, Zhichao. "Mode locked fiber lasers and their application in microwave signal generation." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/26886.
Повний текст джерелаHe, Xuan. "MIMO Digital Signal Processing in Few-Mode Fiber Optical Communication Systems." Thesis, University of Louisiana at Lafayette, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3687684.
Повний текст джерелаSpace-division multiplexing (SDM) has been extensively proposed to overcome the next capacity crunch with ever-increasing data and video traffic. Among several SDM approaches, mode-division-multiplexing (MDM) in few-mode fiber (FMF) is the most auspicious technology. One key challenge in FMF transmission systems is random mode coupling among different fiber modes, which can cause severe inter-modal crosstalk. Moreover, large accumulated differential mode group delay (DMGD) can induce significant inter-symbol interference (ISI).
The approach of adaptive multi-input multi-output (MIMO) digital signal processing (DSP) has been proposed and demonstrated to untangle the crosstalk between the spatial modes and compensate the DMGD. In FMF systems, compared with time-domain adaptive MIMO signal processing, the implementation of frequency domain method achieves much lower hardware complexity. In this dissertation, a single-stage adaptive MIMO equalizer is proposed to compensate both DMGD and chromatic dispersion (CD) simultaneously in order to further reduce the hardware complexity.
Except for hardware complexity, the convergence rate of adaptive MIMO equalizer is another essential concern. The adaptive MIMO equalizer with slower convergence speed requires longer training symbols, thus decreasing the system overall efficiency. In the dissertation, two advanced step size control methods are presented to increase the convergence rate of the conventional FD-LMS algorithm. The first approach is the signal power spectral density (PSD) dependent method, which adopts the step size for each frequency bin inverse to its power level in order to converge the estimated equalization error to zero, thus it is the optimal solution in the systems with noise-free channel. The other method is the noise PSD directed method, which adopts the frequency bin-wise step size to render the estimated error converge to the channel background noise, thus it is the optimum solution in the systems with additive white Gaussian noise channel.
Arihilam, Edwin. "Measurement of electromagnetic noise coupling and signal mode conversion in data cabling." Thesis, De Montfort University, 2018. http://hdl.handle.net/2086/17479.
Повний текст джерелаBansen, Justin Andrew. "Evaluation of Traffic Operations at Intersections in Malfunction Flash Mode." Thesis, Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10551.
Повний текст джерелаAzadeh, Mohammad. "Current mode processing and architecture for optoelectronically interconnected arrays /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/6104.
Повний текст джерелаShahbaz, Askari. "Dual mode brain near infrared spectroscopy and electroencephalography hardware design and signal processing." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58418.
Повний текст джерелаWang, Ruonan. "Enhancement/depletion-mode HEMT technology for III-nitride mixed-signal and RF applications /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?ECED%202008%20WANG.
Повний текст джерелаHua, Thanh Phong. "Adaptation mode controllers for adaptive microphone arrays." Rennes 1, 2006. http://www.theses.fr/2006REN1S136.
Повний текст джерелаChuai, Kun. "High order phase-locked loop design and test for time-mode signal processing applications." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=95015.
Повний текст джерелаCe mémoire présente tout d'abord une approche systématique descendante pour la conception de boucles à verrouillage de phase (PLL) ayant un ordre arbitraire et opérant comme filtre anti-image ou anti-repliement pour le traitement de signal dans le domaine temporel. Un PLL de 6e ordre a été conçu et fabriqué sur une carte de circuit imprimé montée sur un tester à signaux-mixtes (ATE). La fonction de filtrage et la caractéristique de transfert de grands-signaux sont vérifiées à l'aide d'une solution de conception pour test (DFT) entièrement numérique. Le signal d'entrée numérique est cadencé par une horloge unique. Par conséquent, le signal de test peut être programmé sans effort à partir de l'instrument numérique à haute-vitesse (HSD) d'un testeur à signaux-mixtes (ATE). De plus, un système précis et économique de génération de délai d'horloge est présenté comme une application du PLL construit. A l'aide de calibration et compensation appropriées, une résolution de délai de l'ordre de 15 ps est réalisée pour un intervalle de 8.4 ns. Cette technique est démontrée expérimentalement comme étant une solution viable pour l'alignement d'horloge et pour mesurer le vacillement d'horloge à un rythme de sous-échantillonnage de 50 GHz.
Lemonnier--Le, Penhuizic Claire. "Effets d'oligosaccharides sur l'embryogenèse de microspores de brocoli : : mode d'action et transduction du signal." Rennes 1, 2001. http://www.theses.fr/2001REN10085.
Повний текст джерелаBenyahya, Kaoutar. "Mode group division multiplexing for short reach optical communications." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S117.
Повний текст джерелаThe ever-growing demand of data traffic will be fuelled by revolutionary technologies such as virtual reality (VR), augmented reality (AR) and Internet of things (IoT). Therefore, optical networks should support the requirements of these services in terms of high capacity, low latency and high reliability. In fact, large scale capacity is a critical need for fiber optic communication systems deployed in local area networks as well as in datacenters. For both applications, systems relying on intensity modulation and direct detection (IMDD) are highly demanded due to their low cost and compatibility with short range applications. In this thesis, we address the need of increasing the data rates for short reach optical communication systems based on mode group division multiplexing and direct detection schemes. Firstly, we focus on increasing the capacity of already deployed standard multimode fibers in local area networks and intra-datacenters communication where the distance is shorter than 5 km. Secondly, we extend our solution to longer reach applications such as inter-datacenter interconnects. In both cases, optical link architectures, including transmitters, receivers and the optical fibers are analysed. Moreover, modulation formats adapted to IMDD systems such as single carrier 4-PAM and multicarrier DMT are compared in the context of space division multiplexing transmission. In this work we demonstrated the achievable benefit of mode group multiplexing combined with IMDD schemes. First, 5 Tb/s has been achieved over 2.2 km of conventional multimode fiber (OM2). Secondly, transmission record at the corresponding time of its realization of 14.5 Tb/s over OM2 fiber is demonstrated. Finally, 200 Gb/s over 20 km of FMF has been achieved which extend the benefit of mode group multiplexing to longer reach applications compared to LAN and intra-datacenter where the maximum distance is limited to 5 km
Bennett, Michael J. "Signal processing techniques for ultrasonic tissue Doppler and real-time B-mode imaging in cardiology." Thesis, University of Edinburgh, 2005. http://hdl.handle.net/1842/10779.
Повний текст джерелаQuinlan, Franklyn. "LOW NOISE, HIGH REPETITION RATE SEMICONDUCTOR-BASED MODE-LOCKED LASERS FOR SIGNAL PROCESSING AND COHERENT COMMUNICATIONS." Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3393.
Повний текст джерелаPh.D.
Optics and Photonics
Optics and Photonics
Optics PhD
Schlottmann, Craig Richard. "A coordinated approach to reconfigurable analog signal processing." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/49021.
Повний текст джерелаCurtis, Eddie J. "Comprehensive on-street bicycle facilities: an approach for incorporating traffic signal operational strategies for bicycles." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53478.
Повний текст джерелаOzharar, Sarper. "Stable optical frequency comb generation and applications in arbitrary waveform generation, signal processing and optical data mining." Orlando, Fla. : University of Central Florida, 2008. http://purl.fcla.edu/fcla/etd/CFE0002388.
Повний текст джерелаPOMPEI, DOMINIQUE. "Caracterisation et selection des modes de propagation dans les lignes microondes : generalisation du formalisme quasi-tem, utilisation des techniques de traitement du signal dans la methode tlm." Nice, 1987. http://www.theses.fr/1987NICE4123.
Повний текст джерелаGuo, Jing. "MULTI-MODE SELF-REFERENCING SURFACE PLASMON RESONANCE SENSORS." UKnowledge, 2013. http://uknowledge.uky.edu/ece_etds/13.
Повний текст джерелаKotecha, Ramchandra M. "Analysis and Comparison of Popular Models for Current-Mode Control of Switch Mode Power Supplies." Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1300211710.
Повний текст джерелаPeric, Vedran. "Non-intrusive Methods for Mode Estimation in Power Systems using Synchrophasors." Doctoral thesis, KTH, Elkraftteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-182134.
Повний текст джерелаThe Doctoral Degrees issued upon completion of the programme are issued by Comillas Pontifical University, Delft University of Technology and KTH Royal Institute of Technology. The invested degrees are official in Spain, the Netherlands and Sweden, respectively.
QC 20160218
FP7 iTesla
Du, Tzung-Tze, and 杜宗澤. "Signal Recognition by Using Empirical Mode Decomposition." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/39258799449139483328.
Повний текст джерелаChen, Jyun Min, and 陳峻敏. "A Mixed-mode Biomedical Signal Interface Circuit." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/01660351017917260683.
Повний текст джерела輔仁大學
電機工程學系
101
In this thesis, a mix-mode biomedical signal interface circuit is proposed. This circuit removes the noise of transistors by chopper modulation, and the topology of the feedback loop eliminates the common-mode noise of the input signal. In order to reduce the variability of analog circuits, the input signal is digitized by the analog-to-digital converter (ADC) after amplification. The digitized signal is filtered through the digital filter in the digital domain. The input common mode noise is obtained from the digital low-pass filter and is fed back to the input by a digital-to-analog converter (DAC) for cancellation. Sharing the identical capacitor array in ADC and DAC, and implementing the low-pass filter in the digital domain avoid the large capacitor area requirement of the analog low-pass filter. This approach effectively reduce the circuit area. This circuit is designed with a CMOS 0.18m technology at a supply voltage of 1.8V. The chip area is 1.224mm X 1.348mm. The amplifier provides 100, 200, 400, and 800 four selections of magnification. The input range of 10-bit differential data converter is -1V~+1V and the sample frequency is 6.67kS/s.
Yang, Chung-Huang, and 楊忠煌. "ISFET Performance Enhancement by Mixed-Mode Signal Processing." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/k3c6wr.
Повний текст джерела中原大學
電子工程研究所
93
Abstract Silicon-based semiconductor micro sensors are now able to react to the ion concentration (activity). The ISFET has features of rapid reaction time, high sensitivity, batch processing, small size and single chip integration. Furthermore, it can be implemented by CMOS technology. These advantages make it the first choice for VLSI electrochemistry bio-inspired applications. ISFET has been characterized and measured, indicating drawbacks related to: thermal dependency, long-term drift and hysteresis. To enhance the accuracy in biomedical related research, it is necessary to find a compensation method to cancel or reduce these effects. In this thesis, a single chip implementation of an ISFET-based pH-meter system and a discrete temperature compensation chip have been successfully designed, fabricated and tested. The two-point calibration circuitry based on the response of standard pH4 and pH7 buffer solution has been implemented by using Algorithmic State Machine (ASM) hardware algorithms. For homeland environmental applications, the system provide rapid, easy to use, and cost-effective on-site testing on the quality of water, such as drinking water, ground water and river water. The processor has a potential usage in battery-operated and portable devices in environmental monitoring applications compared to commercial hand-held pH meter. In order to capture the response of the ISFET sensors, it is necessary for the ISFET to be accompanied by an analog readout interface. This study devises a new integrated ISFET electronic interface circuit embedded with noise rejection capability. In addition, an approach to enhance accuracy of the output signal obtained from ISFET interface electronics due to the body effect is proposed. The scheme allows reduction of influence of body effect. Using only one ISFET with a differential output configuration, we obtained temperature dependency and long-term drift as well as common noise compensation. Simulation and experimental results show a great effect on monolithic ISFET integration in CMOS technology.
Alico, Jurgen. "Multiphase Optimal Response Mixed-signal Current Program Mode Controller." Thesis, 2009. http://hdl.handle.net/1807/18135.
Повний текст джерелаGao, Jiexin. "Towards a Unified Signal Representation via Empirical Mode Decomposition." Thesis, 2012. http://hdl.handle.net/1807/33208.
Повний текст джерелаLi, Ji-shian, and 李季憲. "Development of Digital Signal Processor Based Switched Mode Rectifiers." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/hjmbus.
Повний текст джерела國立臺灣科技大學
電機工程系
95
ABSTRACT This thesis presents the design and implementation of a digital signal processor based switched mode rectifiers for telecommunication power systems. A two-leg parallel-connected circuit with single-phase power factor correction is proposed for ac-dc power conversion. Equal and time-sharing current control is achieved through interleaved pulse-width-modulation to reduce input current ripple. In addition, current-predicted control is used to raise the power factor to unity. On the other hand, dc-dc power conversion is designed with full-bridge power circuit. The zero-voltage switching is accomplished by phase-shifted control to reduce switching loss. The current doubler rectifiers installed at output side can reduce conducting loss of output filtering inductors. Finally, the introduction of load power compensating control in power factor correction circuit will improve system performance and reduce the input current harmonics. In this thesis, switch equivalent circuit is first derived and then simulated by Matlab/Simulink to verify the proposed control strategy. The 32-bit digital signal processor, TMS320F2812, is used to implement the control functions of the system. The control functions of voltage and current closed-loop controls are realized by software to reduce circuit components and improve reliability. In addition, the digital signal processor communicates with personal computer by controller area network interface for real-time monitoring. An experimental system of 48V, 500W output power for 110V, 60Hz input is built with the dc-link voltage of 380V. The efficiency is 89% in full-load operations, and the power factor is 0.993. The total harmonic distortion of input current is 4%, which complies with IEEE Std 519-1992.
Cheng, Shao-Chun, and 鄭少鈞. "A Novel Mixed-Mode Signal Processor Design by Current-Mode Circuits for Biomedical Sensing System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/79148296750872794243.
Повний текст джерела中原大學
電子工程研究所
97
The purpose of this research is to design a biomedical sensing system which can sense different kinds of physiological parameters (e.g. glucose, uric acid, etc.). The described system utilized amperometric sensor to measure the physiological parameters which is designed using current-mode circuits. The biomedical sensing system consists of three sub-circuits: 1) potentiostat, 2) current comparator, and 3) current-mode pipeline ADC (analog to digital converter). The sub-circuits were implemented using current-mode circuits, making this research different from others. Some researches used different methods in which the input current is still to be converted to output voltage then use the voltage-mode ADC. This work, however, uses input current signals directly eliminating the need for converting current signals to voltage. The highlight of this research is the implementation of the sensing system which made it more suitable for low voltage system. Since the output signal is current, the range of output is not limited by low voltage power supply. Another advantage of this research is its wide dynamic range of sensing current. This is used to simultaneously sense both glucose level (large sensing current) and uric acid level (small sensing current). The first stage of this system is a novel potentiostat readout circuit which can sense current from 250 pA to 80 μA. The second stage is a novel current comparator which is the core of the third stage of this system. The advantage of the novel current comparator is its high accuracy, in which the differential current of the current comparator can be as small as 0.6 nA and still maintaining a valid output on the current comparator. Increasing the accuracy of current comparator will also increase the resolution of current mode ADC. Therefore, the system can sense more kind of physiological parameters. The whole system is implemented using TSMC 0.35 μm Mixed-Signal 2P4M Polycide 3.3V/5V process of National Chip Implementation Center (CIC), Taiwan. The chip was tested by measuring the glucose level of the glucose solution. The signal linearity were measured, analyzed and recorded using LabVIEW.
郭榮銘. "Balanced Bandpass Filter Designs of Possessing Common Mode Signal Suppression." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/21460279845801258052.
Повний текст джерела建國科技大學
電子工程系暨研究所
99
This thesis aims to research the design of common mode rejection of balanced bandpass filter, and implement in micro-wavelet board. In the first part of this thesis, I study the basic principles of balanced bandpass filter, the two- two-level Step impedance Resonators (SIR), the external quality factor of a single load resonators, the coupling coefficient of a coupled resonator, Split-Ring Resonators (SRR), Defected Ground Structure (DGS) and so on, as the theoretical basis of this thesis. In the second part, first of all, a pair of similar SRRs and a pair of DGSs embedded in the ground plane are used to design a band-pass filter which could satisfy both differential mode response and common mode rejection response. The broadband response mainly utilize the strong coupling mechanism so that the already split modal is divided again to form four poles to prop up the key to form broadband. In addition, a bandstop effect is generated by a pair of DGS to form a zero point mechanism and designed in the common-mode resonance point so as to reduce the signal pass to achieve the suppression effect. In the third part, this thesis uses the configuration of T-type and λ/2 SIR resonator to design the balanced dual band pass filter structure with common mode rejection. The main concept is to design a good differential mode signal using λ/2 SIRs of 2.45 GHz and 5.25 GHz, and the T-resonator in differential mode has the same signals through; In common mode, there is a zero suppression in the common-mode resonance point generated by λ / 2 SIRs. In this thesis, an open stub is used to form a zero point mechanism to strengthen the common mode signal suppression. The designed circuit in this study is verified by real circuit. The result shows that either broadband or balanced dual band pass filter has a very good response to the differential mode and the common mode. Expected the completions of broadband and balanced dual band pass filters in this thesis can be applied to the OFDM and WLAN in the actual communication system. The proposed design method can be used as a useful reference for R & D personnel.
Huang, Chien-ming, and 黃建銘. "DSP Implementation of Empirical Mode Decomposition for ECG Signal Processing." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/98430266128831295357.
Повний текст джерела國立中央大學
電機工程研究所
96
The empirical mode decomposition (EMD), Recently, has been used extensively to the analysis of the signal. EMD, which use yardstick change of time within signals to resolve signals into the combination of several intrinsic mode functions (IMFs). IMFs contain different characteristics of signals and can express the physical characteristics in signals. The Electrocardiogram (ECG) is one of the import methods for diagnosis of heart diseases. But the ECG recordings are often corrupted by baseline wander and power line interference. Baseline wander is mainly caused by subjects breathing and movement. The power line interference also corrupt the ECG signals, which come from power lines to the measurement equipments. These interferences may cause the ECG distortion and lead to wrong diagnosis. This study proposed DSP implementation of the EMD algorithm and develop a complete system for signal processing without computer.
Huang, Jie-Cyun, and 黃捷群. "A Pipelining Empirical Mode Decomposition for Emotionalized Speech Signal Processing." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/37261152719232626254.
Повний текст джерела清雲科技大學
電子工程系所
97
In this thesis, the pipelining technique is integrated into the empirical mode decomposition of the nonlinear signal processing. This newly pipelining empirical mode decomposition also is applied to construct the front processing unit of an emotionalized spontaneous speaker and speech recognition system in this thesis. This novel approach owns the ability to reduce the computing time, so it can empower our emotionalized spontaneous speaker and speech recognition system to satisfy the real-time requirement. There are proved that the speech recognition rate’ difference between the pipelined and non-pipelined voice signals are less than 3%, even though the pipelined voice signals have some distortions. The experiments in the final part of this thesis present the detail comparisons between the pipelined and non-pipelined signals and speech recognition rates. The architecture of the speech recognition system in an emotionalized spontaneous speech includes four major parts: speech signal processing, pipelining empirical mode decomposition, feature extraction, and dual-model identification systems. That feature is to use the pipelining empirical mode decomposition technique to online extract the speaker voice characteristics and identification first, and then to find out the personal and characteristic vocabulary voice model of the person, according to the model to identify the pronunciation voice commands is the last step. This design makes the voice commands identification more accurate, and the stored vocabulary voice model can also owns the personal characteristic of some specified speaker simultaneously.
Yeh, Jia-Rong, and 葉家榮. "APPLICATIONS OF EMPIRICAL MODE DECOMPOSITION (EMD) IN PHYSIOLOGICAL SIGNAL ANALYSIS." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/82879254109505190946.
Повний текст джерела元智大學
機械工程學系
97
The functions of the human body are frequently associated with physiological signals, which convey hidden information, determined by the various complicated underlying mechanisms. Moreover, physiological signal processing and analysis are interdisciplinary topics. A physiological system is non-linear and non-stationary, therefore, most of traditional algorithms based on linear assumption cannot satisfy the requirements for physiological signal analysis. Recently, empirical mode decomposition (EMD) was proposed as a signal processing and analysis algorithm for nonlinear and non-stationary systems. EMD also performs as an adaptive analysis algorithm, which doesn’t need a priori. In 2006, we used EMD and found that helps in research on physiological signal analysis. Therefore, we decide to focus our research on the processing algorithms of EMD and its correlated applications. In the processing algorithm, we proposed a noise enhanced algorithm of complementary ensemble empirical mode decomposition (CEEMD) to solve the mode-mixing problem of the original EMD and to improve the efficiency of EEMD. According to signals with or without dominant components, physiological signals are assorted into two different categories. A broad-band signal is defined as a signal without dominant components and a narrow-band signal is a signal with dominant components. Moreover, EMD acts as a natural filter bank for narrow-band signals and as a dyadic filter bank for broad-band signals. Therefore, we developed different applications of EMD according to the essential characteristics of the signals. These applications include the complexity quantification, verification of high-frequency fluctuation in signals, and the intrinsic component extraction. In this thesis, we present three different applications of EMD on physiological signal analysis to demonstrate the functions of EMD. In the first application of complexity quantification, EMD acts as a dyadic filter bank to decompose a human heartbeat interval into several IMFs adaptive to the intrinsic timescales and power-law distributions of data. The power-law distribution presents a long-term correlation, just as Hurst exponent and DFA scaling exponents do. Moreover, the distribution of intrinsic timescales of signals presents an extra property in a signal. Thus, the two-parameter scheme of complexity quantification was developed using the intrinsic timescale and power-law distributions. In addition, we developed two different approaches, the EMD-based DFA and the intrinsic mode analysis (IMA), to investigate human heartbeat interval. We found that the distribution of intrinsic timescales performs as a good indicator for patients with of without heart disease (i.e., CHF or AF) and the power-law distribution performs as an indicator for aging. In addition, EMD associates with Monte Carlo verification to act as a filter, which can be used to filter high-frequency noise from a signal. In the second application of EMD associating with linguistic analysis, we demonstrate the use of EMD as a filter. In such an application, the blocking index is designed using the distant measurement of similarity. Moreover, the blocking index is succeeded in verifying the fluctuation pattern of blood pressure (BP) during artery clamping or relaxing. In the third and last application, EEMD acts to decompose the intrinsic components from narrow-band signals, such as ECG and BP. We demonstrate two approaches of intrinsic component extraction. Here, an intrinsic component is defined as an IMF, which presents the response of a particular physiological mechanism. These two approaches of intrinsic component extraction are the EEMD-based reflected wave quantification and multi-modal analysis. EEMD works to extract the reflected waves from BP in the EEMD-based reflected wave quantification and the cardiac oscillations from ECG and BP in the multi-modal analysis. In this application, these EEMD-based analysis methods are succeeded in figuring out the correlations among systolic arterial pressure (SAP), arterial stiffness, and dynamic property of the circulation system. Without doubt, EMD is a powerful signal processing and analysis algorithm for signals measured from nonlinear and non-stationary systems. Although, the development of processing algorithm and the application of EMD is still at an early stage, we derived useful information from the physiological signals by these analysis algorithms based on EMD or EEMD. We believe that we can create more applications of EMD for physiological signal analysis in the future.
YEH, CHIH-CHEN, and 葉治成. "Elimination of Common-Mode Noise Using Time-Offset Differential Signal." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/51067389982755048691.
Повний текст джерела國立臺灣科技大學
電子工程系
100
In this thesis, the timing-offset differential signal is proposed to eliminate the differential-to-common mode conversion induced by the unequal paths of the bended differential transmission line, which includes the bended differential transmission line using the right-angle bend, differential serpentine delay line and differential serpentine delay line with strongly-coupled turns. The improvement is demonstrated as follows. First of all, in order to eliminate the TDT common mode noise of bended differential transmission line using the right-angle bend, the timing-offset differential signal is applied on the bended differential transmission line. The measured TDT common-mode noise is about 0.019V, which is much smaller than 0.065V of the bended differential transmission line without the timing-offset signal. Besides, the measured TDR differential-mode noise is about 0.023V, which is also smaller than 0.033V of the bended differential transmission line without the timing-offset signal. Furthermore, in order to investigate the frequency-domain S-parameters, we introduce the idea of equivalent S-parameters for the timing-offset bended differential transmission line. According to the simulation results, the timing-offset bended differential transmission using the right-angle bend can substantially reduce the mode conversion, which has 7 dB improvement from DC to 6 GHz. Besides, the timing-offset bended differential transmission line using the right-angle bend does not increase the differential-mode or common-mode reflection at the sending end. Also, it can increase the differential-mode to differential-mode transmission at the receiving end. In addition, the phase of the differential-mode to differential-mode transmission has a linear response. Finally, in order to investigate the insights of the reduction of the mode conversion, we extract the equivalent circuit parameters of the timing-offset bended differential transmission line using the right-angle bend. According to the equivalent circuit parameters, since the self-inductance (L13=2.0822 nH) of the inner path is quiet close to the self-inductance (L24=2.0688 nH) of the outer path and the self-capacitance (C11= C33=0.16837 pF) of the inner path is also close to self-capacitance (C22= C44=0.2535 pF) of the outer path, the differential signal on the inner and outer paths will approximately reach the receiving end at the same time, causing a great reduction in the common noise. Secondly, we investigate the differential serpentine delay line and differential serpentine delay line with strongly-coupled turn. Owing to the even number of the coupled delay line, the lengths of the inner and outer paths become unequal, inducing the common mode noise at the receiving end. In order to reduce the common mode noise, the timing-offset differential signal is applied on the differential serpentine delay line. The mode conversion of the timing-offset differential serpentine delay line is below –13dB from DC to 15GHz. As compared with mode conversion of the differential serpentine delay line, the mode conversion is reduced. Besides, the amplitude of the TDT common-mode noise at the receiving end is reduced from 0.0289 V to 0.0117 V whereas the amplitude of the TDR differential-mode noise at the sending end is not increased. Furthermore, the timing-offset differential signal is applied to the serpentine delay line with strongly-coupled turn so as to further reduce the common mode noise. The mode conversion of the timing-offset differential serpentine delay line with strongly-coupled turns is below –18dB from DC to 15GHz. As compare with the mode conversion of the differential serpentine delay line with strongly-coupled turns, the mode conversion is decreased. Besides, the amplitude of the TDT common-mode noise at the receiving end is reduced from 0.0154 V to 0.0065 V whereas the amplitude of the TDR differential-mode noise at the sending end is not increased. In order to verify the simulation results of the timing-offset serpentine delay line and timing-offset serpentine delay line with strongly-coupled turns, 5.72 times scaled down serpentine delay lines are fabricated and measured. The measurement results of the scaled down circuits, which are in good agreement with the simulation results, verifies our designs.
Wu, Chi-hsun, and 吳奇勳. "Extraction of EEG/MEG Signal Features Using Empirical Mode Decomposition." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/34944762489271172220.
Повний текст джерела國立中央大學
電機工程學系
101
Electroencephalography (EEG)/Magnetoencephlography(MEG) has been applied for investigation of neuroscience and diagnosis of many neurological disorders. The noninvasive EEG recordings are overlapping potentials from spontaneous brain rhythm, physiological artifact and external interference. Accordingly, extraction task-related signal features is crucial in the field of EEG/MEG signal processing. The aim of this study is to develop an EMD-based approach to extract single-trial EEG signal. The EMD method decomposed an EEG/MEG epoch into various scale of sub-band component called intrinsic mode function (IMF) and customized the recognition of task-related component to suppress the task-unrelated component. This dissertation evaluates the performance of EMD in EEG or MEG signal into the applications of steady-state visual evoked potential based brain computer interface (SSVEP-based BCI), sensorimotor mu rhythm extraction and olfactory event-related potential extraction. To evaluate the performance of SSVEP feature extraction, this study presents an empirical mode decomposition (EMD) and refined generalized zero crossing (rGZC) approach to achieve frequency recognition in SSVEP-based BCI. The EMD-rGZC improves the information transfer rate (ITR). Event-related desynchronization (ERD) and synchronization (ERS) analysis methods have been widely used in studying movement-related sensorimotor functions in human brain. Movement-related ERD is functionally related to motor planning and initialization, while movement-related ERS is related to motor inhibition and motor cortex resetting. This study developed a single-trial brain rhythm analysis method based on EMD method to discover the mechanisms of ERD and ERS in normal subjects and Parkinson’s patients as well, which could be used as a clinical index for diagnosing Parkinson’s patients. In the study of olfactory event-related potential (OERP) feature extraction, we developed an EMD-based approach to extract OERP from multi-channel EEG recordings. The EMD approach decomposes a signal into IMFs by iteratively conducting the sifting process. Dual criteria on frequency and spatial template were adopted to facilitate the selection of OERP-related IMFs and to reconstruct single-trial OERP for inter-trial investigation.
Chi-Hsien and 賴其賢. "56Gb/s High-speed Signal Transmission along Single-mode Fiber." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/umqdr9.
Повний текст джерела國立臺灣科技大學
電子工程系
105
This work investigates the transmission of 56Gb/s PAM-4 and NRZ signals through a single-mode fiber to satisfy the requirement of IEEE 400GBASE-LR8 standard. We also compare the performance and discuss the challenges of high-speed data transmission using the direct modulation lasers and external-modulation lasers. High-speed information transmission stimulates the fast increasing bandwidth demands that becomes very challenging for modern communication networks. The researchers are working hard to develop high-speed data transmission technologies that can meet the bandwidth growth demand while lowering the cost and energy consumption of the optical transceivers. For data centers, optical communication is the most effective solution. After 100Gb/s transceivers were commercialized, 400Gb/s optical transceivers become one of the hottest research topic and many advancements are published in the journals and conferences. However, there are many challenges yet to be overcome. In this thesis we successfully demonstrated the transmission of 56Gb/s PAM-4 signals using an electro-absorption modulation laser over up to 10km of single-mode fiber and obtained a bit-error-rate (BER) of about 〖10〗^(-5), which can be improved to 〖10〗^(-12) by using and equalizer on the receiver end. The transmission of 56Gb/s NRZ signal along 10-km single-mode fiber can have a BER of roughly 〖10〗^(-6). These results lay a foundation of realizing 400Gb/s optical transceivers using 8-channel of 56-Gb/s light sources.
Chen, Szu-Yu, and 陳思予. "Reformed Intrinsic Mode Decomposition and its Application for Signal Processing." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/2z5f5e.
Повний текст джерела國立臺灣師範大學
機電科技研究所
97
Signal processing is very important for science and engineering researches. Real world signals are often noisy, non-stationary, and obtained from nonlinear systems. However, the majority of signal processing algorithms proposed in the literature such as Fourier transform are better suited for analyzing the linear stationary signals with weak noise. Empirical Mode Decomposition (EMD) provides a powerful tool for adaptive multi-scale analysis of nonlinear and non-stationary signals. In this thesis, the proposed improvement way of three main topics on the algorithm, stopping criterion, envelope and boundary effect, were summarized and compared. In addition, we make a brief introduction involving orthogonality condition of basis functions, the limitation of decomposition capacity and reconstruction issue of basis functions. It inspired us to propose the Reformed Intrinsic Mode Decomposition (RIMD) by the study of piecewise linear signals in the literature. The best feature of piecewise linear processing is to obtain the faster decomposition efficiency. In this study, we utilize this notion to get middle points and then establish the mean envelope, and propose following methods for the application of real signals: connecting middle points by cubic spline, connecting middle points by the propotion of the original signal, and finding the mean envelope. RIMD is not only reducing the computational cost but also decreasing the selection of extrema for the boundary effect. It will make signals smoother and more symmetric in the sifting process. At last, the results of decomposition using RIMD for the simulated and testing signals were analysized and discussed.
Lin, Shao Wei, and 林劭瑋. "The Large Signal Model of Enhancement–Mode pHEMT and Microwave Tripler Circuit DesignThe Large Signal Model of Enhancement–Mode pHEMT and Microwave Tripler Circuit Design." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/95886604736216491955.
Повний текст джерела長庚大學
電子工程研究所
95
InGaP/InGaAs pHEMT device is one of the most important device of Ⅲ-Ⅴsemiconductors in military and commercial communication applications at microwave and millimeter-wave frequencies. It is extremely important to model the characteristics of the transistors before you use the transistors to design a MMIC circuit. To know the dc, RF or noise characteristics of the transistors accurately are the essential issues of designing the MMIC circuits, such as low noise amplifiers. This thesis contains both the small-signal and large-signal modeling methods of the InGaP/InGaAs pHEMT. The determined small- signal equivalent circuit by using the small-signal modeling method described in this thesis fits the S-parameters very well up to 20 GHz. The nonlinearity of dc characteristics and intrinsic elements of the InGaP/InGaAs pHEMT are investigated. several empirical nonlinear equations, which are used in the modified Angelov model, are adapted to model these nonlinear effects and give a good agreement both in dc and RF characteristics of the devices. A Ka band tripler have been realized in a 0.15μm GaAs pHEMT technology. The circuits are based on different 180 power divider structures. The circuits achieve minimum conversion loss of -16 dB.
Yang, Chao-Kun, and 楊朝坤. "Monitoring an Active Mode-Locked Fiber Laser Using the Internal Second Harmonic Signal of Its Mode Locker." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/98539548410895133019.
Повний текст джерела逢甲大學
光電物理研究所
92
In this thesis we used a distribution feedback type laser diode as an active mode locker, and built up an active mode-locked fiber ring laser using circulator, polarization controller, erbium–doped fiber amplifier and fiber coupler. With the help of a dichroic beamsplitter, we can measure the internal second harmonic signal of the mode locker. In this experiment, pulse train at a repetition rate of 993.247 MHz (153th harmonic of fundamental frequency of ring cavity) was obtained. The pulse width was 201 ps. The side-mode suppression ratio was 52.7 dB. When the fiber laser was actively mode-locked, we observed the internal second harmonic to be 14 pW. We observed the internal second harmonic to be 5pW as the laser was not actively mode-locked. So we can monitor an active mode-locked fiber laser using the internal second harmonic signal of its mode locker. In the future, this mode-locked laser can be used as a 1.5µm optical frequency comb.
Zhong, Guo-Jun, and 鍾國俊. "Wideband Common-mode Suppression Filter Design for Multi Differential Signal Pairs." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/8cdu46.
Повний текст джерела國立臺北科技大學
電腦與通訊研究所
102
In this thesis, we proposed a wideband common-mode suppression filter for multi differential signal pairs. The method of the proposed design is utilized by using defected ground structure (DGS) of quarter-wavelength resonators with the mutual coupling effect between the quarter-wavelength resonators to achieve the wideband common-mode suppression. The proposed structure is fabricated on printed circuit board (PCB) with low coast and simple manufacture. In multi differential signal pairs, we still have an advantage of a wideband common-mode suppression. For observing one pair differential signal lines in the frequency domain analysis, the differential-mode insertion loss are all above -3 dB from DC to 10 GHz. For the common-mode insertion loss, a wide common-mode suppression bandwidth is 4.2 GHz by using -15 dB definition. The equivalent circuit model of the proposed DGS resonators has also been constructed to predict the phenomenon of the common mode suppression. Then, the result shows a good agreement between simulation and measurement. The results indicate that the proposed common-mode filter has broadband operation on common-mode suppression and multi differential signal pairs. In addition, it can maintaining the good signal integrity of differential signal pairs. Finally, by measuring eye diagrams and frequency domain results validate Wideband Common-mode Suppression Filter Design for Multi Differential Signal Pairs.
Tse-AnChen and 陳則安. "A Dual-Mode AC Signal Processing IC for Bio-Sample Detection." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/40611188309951510635.
Повний текст джерела國立成功大學
電機工程學系碩博士班
98
With the improvement of sanitation, the invention of vaccines, the innovation of medical technology, and the progress in health care systems, the incidence of disease is significantly decreased, the cure rate is also increased and the average life of human being has been prolonged significantly. Therefore, the biomedical detection can early detect the disease and even prevent disease gets more and more attention. In recent years, integrating biomedical detection technology into chips is one of the main trends in IC design field. By integrating the circuits, people can perform their basic bio-detections at home, with no need to go to hospital. The presented chip uses the electrochemical impedance spectroscopy (EIS) method. Compared with other bio-sample detection methods, this detection method is much faster, and both the input signals and measured signals are all electro signals, so it can be directly and effectively integrated the circuit into the system chip. This chip contains the entire front-end input signal processing circuit and sensing circuits of the bio-sample detection system. The input signal processing circuits can provide two sets of identical constant voltage or constant current AC signals. Its frequency range is from 10 Hz to 10 kHz, its output voltage range is 1.5V~3.5V, and the maximum magnitude of its output current is 1mA. Besides, the sensing circuits detect the magnitude and phase of the measured signals, and convert them into DC outputs. The die area of this chip is 1.7x2.0mm^2 , and the package is 40 S/B. The chip was implemented by Taiwan Semiconductor Manufacturing Company (TSMC) 0.35μm 2P4M 5V mixed-signal polycide process, patronized by National Chip Implementation Center (CIC).