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Dissertations / Theses on the topic 'Amplitude and frequency modulation'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Secan, Stephen R. "Amplitude and frequency modulation in Oboe Vibrato." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1407510603.

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2

Bracht, Roger. "RADIO FREQUENCY PATH CHARACTERIZATION FOR WIDE BAND QUADRATURE AMPLITUDE MODULATION." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607351.

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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>Remote, high speed, high explosive wave front monitoring requires very high bandwidth telemetry to allow transmission of diagnostic data before the explosion destroys the sensor system itself. The main motivation for this study is that no known existing implementation of this sort has been applied to realistic weapons environments. These facts have prompted the research and gathering of data that can be used to extrapolate towards finding th

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Bracht, Roger, Jeff Dimsdle, Dave Rich, and Frank Smith. "RADIO FREQUENCY OVERVIEW OF THE HIGH EXPLOSIVE RADIO TELEMETRY PROJECT." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607352.

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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>High explosive radio telemetry (HERT) is a project that is being developed jointly by Los Alamos National Laboratory and AlliedSignal FM&T. The ultimate goal is to develop a small, modular telemetry system capable of high-speed detection of explosive events, with an accuracy on the order of 10 nanoseconds. The reliable telemetry of this data, from a high-speed missile trajectory, is a very challenging opportunity. All captured data must be t

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4

Simms, Dennis, and Kurt Kosbar. "IMPROVEMENTS IN AUTOMATIC MODULATION RECOGNITION OF ASK AND FSK SIGNALS." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/608248.

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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California<br>An algorithm for automatic modulation recognition of ASK, PSK and FSK was developed by Azzouz and Nandi. The algorithm has some serious problems at SNR of 10 dB and below. This paper describes a modification to the algorithm that significantly improves the performance for detection of ASK and FSK at moderate and low SNR.

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5

Brennan, SiobhaÌn Katharine. "Effect of varying the amplitude and frequency modulation phase relationship on steady state evoked potentials." Thesis, University of Sheffield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398681.

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6

Paraouty, Nihaad. "Frequency modulation coding in the auditory system." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEE078.

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Cette recherche visait à clarifier les mécanismes de bas niveau impliqués dans la détection de la modulation de fréquence (FM). Les sons naturels véhiculent des modulations d’amplitude et de fréquence saillantes essentielles à la communication. L’analyse des réponses de neurones auditifs du noyau cochléaire montre que les propriétés spectro-temporelles des stimuli de FM de basse cadence sont représentées par deux mécanismes distincts basés sur le verrouillage en phase à l’enveloppe temporelle (ENV) et à la structure temporelle fine (TFS). La contribution relative de chaque mécanisme s’avère tr

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7

Hopper, David J. "Investigation of laser frequency stabilisation using modulation transfer spectroscopy." Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/16667/1/David_John_Hopper_Thesis.pdf.

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Optical frequency standards are necessary tools for accurate measurement of time and length. In practice these standards are stabilised laser systems locked to a known frequency reference. These references are typically the resonant frequencies of the atoms of an absorption medium that have been theoretically calculated to a high degree of accuracy. This thesis describes a combination of experimental and theoretical research performed on modulation transfer spectroscopy (MTS)--a technique used to frequency stabilise a laser in order to produce an accurate frequency reference--with emphasis pla

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8

Hopper, David J. "Investigation of laser frequency stabilisation using modulation transfer spectroscopy." Queensland University of Technology, 2008. http://eprints.qut.edu.au/16667/.

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Optical frequency standards are necessary tools for accurate measurement of time and length. In practice these standards are stabilised laser systems locked to a known frequency reference. These references are typically the resonant frequencies of the atoms of an absorption medium that have been theoretically calculated to a high degree of accuracy. This thesis describes a combination of experimental and theoretical research performed on modulation transfer spectroscopy (MTS)--a technique used to frequency stabilise a laser in order to produce an accurate frequency reference--with emphasis pla

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9

Zong, Weikai. "Amplitude and frequency modulations of oscillation modes in hot B subdwarf and white dwarf stars from Kepler photometry." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30306/document.

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Les interactions non linéaires entre modes de pulsation, induisant des modulations d'amplitude et de fréquence, sont difficiles à mettre en évidence avec les télescopes au sol en raison des temps caractéristiques en jeu, de l'ordre de la semaine, du mois, ou même de l'année. L'avènement des télescopes spatiaux comme KEPLER (opéré par la NASA) a considérablement changé la donne en apportant de nouvelles données pour ce domaine de recherche. Dans cette thèse, nous analysons les données photométriques obtenues avec KEPLER pour 24 étoiles compactes pulsantes, incluant 18 étoiles sous-naines de typ

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Abu-alhiga, Rami. "Novel feedback and signalling mechanisms for interference management and efficient modulation." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4632.

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In order to meet the ever-growing demand for mobile data, a number of different technologies have been adopted by the fourth generation standardization bodies. These include multiple access schemes such as spatial division multiple access (SDMA), and efficient modulation techniques such as orthogonal frequency division multiplexing (OFDM)-based modulation. The specific objectives of this theses are to develop an effective feedback method for interference management in smart antenna SDMA systems and to design an efficient OFDM-based modulation technique, where an additional dimension is added t

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11

Carroll, Matthew J. "First Order Self-Oscillating Class-D Circuit with Triangular Wave Injection." DigitalCommons@CalPoly, 2021. https://digitalcommons.calpoly.edu/theses/2303.

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An investigation into performance improvements to the modulator stage of a class-D amplifier is conducted in this thesis. Two of the standard topologies, namely class-D open-loop pulse-width modulation (PWM), and the improved self-oscillating feedback system are benchmarked against a topology which includes both a hysteretic comparator in a feedback loop and triangle wave injection. Circuit performance is analyzed by comparing how the triangle injection circuit handles known issues with open-loop and self-oscillating circuits. Using this analysis, it is shown that the triangle injection topolo

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12

Li, Zhongyang. "Modélisation de signaux longs multicomposantes modulés non linéairement en fréquence et en amplitude : suivi de ces composantes dans le plan temps-fréquence." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENT026/document.

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Cette thèse propose une nouvelle méthode pour modéliser les fonctions non linéaires de modulations d’amplitude et de fréquence de signaux multicomposantes non stationnaires de durée longue. La méthode repose sur une décomposition du signal en segments courts pour une modélisation locale sur les segments. Pour initialiser la modélisation, nous avons conçu une première étape qui peut être considérée comme un estimateur indépendant et non paramétrique des fonctions de modulations. L’originalité de l’approche réside dans la définition d’une matrice de convergence totale intégrant simultanément les

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Du, Preez Johannes. "An investigation into OFDM as a suitable modulation tecnique for an acoustic underwater modem." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71806.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: This thesis investigates orthogonal frequency division multiplexing (OFDM) as a viable modulation technique for an ultrasonic acoustic underwater modem. The underwater environment provides a challenging setting for acoustic communications. Long delay spreads due to multipath propagation, severe Doppler frequency shifts, frequency dependent absorption and very limited bandwidth are but some of the challenges to overcome. OFDM essentially provides the parallel transmission of symbols in the frequency domain by simultaneously mo

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Teixeira, Robson Scheffer. "Caracteriza??o dos acoplamentos fase-amplitude na regi?o CA1 do hopocampo." Universidade Federal do Rio Grande do Norte, 2011. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17019.

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Made available in DSpace on 2014-12-17T15:28:49Z (GMT). No. of bitstreams: 1 RobsonST_DISSERT.pdf: 350196 bytes, checksum: eaf6055553dc1f6cec39e0f754c20635 (MD5) Previous issue date: 2011-12-02<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Brain oscillation are not completely independent, but able to interact with each other through cross-frequency coupling (CFC) in at least four different ways: power-to-power, phase-to-phase, phase-to-frequency and phase-to-power. Recent evidence suggests that not only the rhythms per se, but also their interactions are involved in the e

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15

Kakkar, Aditya. "Frequency Noise in Coherent Optical Systems: Impact and Mitigation Methods." Doctoral thesis, KTH, Optik och Fotonik, OFO, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207072.

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The increase in capacity demand along with the advancement in digital signal processing (DSP) have recently revived the interest in coherent optical communications and led to its commercialization. However, design and development of robust DSP algorithms for example for carrier phase recovery (CPR) becomes complex as we opt for high order modulation formats such as 16QAM and beyond. Further, electrical-domain dispersion compensation (EDC), while providing many advantages, makes the system more susceptible to laser frequency noise (FN). For instance, in coherent optical links with post-receptio

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16

Wallaert, Nicolas. "Intégration auditive des modulations temporelles : effets du vieillissement et de la perte auditive." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEE087/document.

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Les signaux de communication, dont la parole, contiennent des modulations d'amplitude et de fréquence relativement lentes qui jouent un rôle capital dans l'identification et la discrimination des sons. Le but de ce programme de recherche doctorale est de comprendre plus finement les mécanismes impliqués dans la perception de l'AM et de la FM, et de clarifier les effets du vieillissement et de la perte auditive neurosensorielle sur ceux-ci. Les seuils auditifs de détection d'AM et de FM sont mesurés pour des sujets normo-entendants (NE) jeunes et âgés, ainsi que pour des sujets malentendants (M

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17

Onunkwo, Uzoma Anaso. "Timing Jitter in Ultra-Wideband (UWB) Systems." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10465.

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Timing offsets result from the use of real clocks that are non-ideal in sampling intervals. These offsets also known as timing jitter were shown to degrade the performance of the two forms of UWB systems impulse radio and orthogonal frequency division multiplexing (OFDM)-based UWB. It was shown that for impulse radio, timing jitter distorts the correlation property of the transmitted signal and the resulting performance loss is proportional to the root-mean-square (RMS) value of the timing jitter. For the OFDM-based UWB, timing jitter introduced inter-channel interference (ICI) and the per

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18

Poojari, Dhiraj. "Effects of frequency and amplitude modulations of phasic discharge behavior of motor units in a sinusoidal sub-maximal force matching task." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 60 p, 2007. http://proquest.umi.com/pqdweb?did=1338920891&sid=4&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Nguyen, Linh Trung. "Estimation and separation of linear frequency- modulated signals in wireless communications using time - frequency signal processing." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15984/.

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Signal processing has been playing a key role in providing solutions to key problems encountered in communications, in general, and in wireless communications, in particular. Time-Frequency Signal Processing (TFSP) provides eective tools for analyzing nonstationary signals where the frequency content of signals varies in time as well as for analyzing linear time-varying systems. This research aimed at exploiting the advantages of TFSP, in dealing with nonstationary signals, into the fundamental issues of signal processing, namely the signal estimation and signal separation. In particular, i

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Nguyen, Linh-Trung. "Estimation and separation of linear frequency- modulated signals in wireless communications using time - frequency signal processing." Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15984/1/Nguyen_Linh-Trung_Thesis.pdf.

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Signal processing has been playing a key role in providing solutions to key problems encountered in communications, in general, and in wireless communications, in particular. Time-Frequency Signal Processing (TFSP) provides eective tools for analyzing nonstationary signals where the frequency content of signals varies in time as well as for analyzing linear time-varying systems. This research aimed at exploiting the advantages of TFSP, in dealing with nonstationary signals, into the fundamental issues of signal processing, namely the signal estimation and signal separation. In particular,

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21

Salamé, Pierre. "Contribution des effets de diverses ambiances acoustiques a l'analyse des mecanismes de la memoire visuelle immediate chez l'homme." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13130.

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La memoire visuelle immediate est fortement perturbee par un environnement acoustique langagier. Alors que le bruit rose, meme intense, n'exerce pas d'effet majeur sur les performances de memoire immediate, la musique locale deteriore le rappel a court terme. Il apparait que l'information visuelle est codee phonemiquement , puis stockee dans un registre phonemique a court terme, par un processus interne de repetition articulatoire

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22

Kroupa, Martin. "Analýza změny zátěže asynchronního motoru z měření statorových proudů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221189.

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This thesis is focused on the evaluation of rotor dynamics of the induction machine, which can be used as a basis for online diagnosis of driven load in the future. It describes the problem of time varying loading torque at its impact to electromagnetic variables in induction machine. Followed by the possible ways of monitoring and diagnostic of loading torque using Fourier analysis on supply current.

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23

Mestre, Adrover Miquel Angel. "Data center optical networks : short- and long-term solutions." Thesis, Evry, Institut national des télécommunications, 2016. http://www.theses.fr/2016TELE0022/document.

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Les centres de données deviennent de plus en plus importants, allant de petites fermes de serveurs distribuées à des grandes fermes dédiées à des tâches spécifiques. La diffusion de services "dans le nuage" conduit à une augmentation incessante de la demande de trafic dans les centres de données. Dans cette thèse, nous étudions l'évolution des réseaux dans les centres de données et proposons des solutions à court et à long terme pour leur intra-connexion physique. Aujourd'hui, la croissance de la demande de trafic met en lumière la nécessité urgente d’interfaces à grande vitesse capables de fa

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Spáčil, Jan. "Komunikační systémy s digitálními modulacemi." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217453.

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The purpose of this semestral project is to explain the basic issues of simple digital modulations through the creation of simple digital modulations using direct digital synthesis. It begins with a short review of digital modulation theory and the theory about direct digital synthesis. All the technical documentation is attached, including schematics and boards of functional modulator.

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Mestre, Adrover Miquel Angel. "Data center optical networks : short- and long-term solutions." Electronic Thesis or Diss., Evry, Institut national des télécommunications, 2016. http://www.theses.fr/2016TELE0022.

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Les centres de données deviennent de plus en plus importants, allant de petites fermes de serveurs distribuées à des grandes fermes dédiées à des tâches spécifiques. La diffusion de services "dans le nuage" conduit à une augmentation incessante de la demande de trafic dans les centres de données. Dans cette thèse, nous étudions l'évolution des réseaux dans les centres de données et proposons des solutions à court et à long terme pour leur intra-connexion physique. Aujourd'hui, la croissance de la demande de trafic met en lumière la nécessité urgente d’interfaces à grande vitesse capables de fa

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Kufa, Jan. "Výkonový zesilovač pro pásmo krátkých vln." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220347.

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The aim of the master´s thesis is to create a high-frequency amplifier with switching power amplifier classes among classes A, B, C with output power of 10 W. The amplifier operates at frequency from 3.5 MHz to 14 MHz. Master´s thesis includes also theoretical analysis, design of lowpass filter and amplifiers and their simulation, mechanical realization and measured parameters of the amplifier.

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Long, Shihe. "Modélisation du canal intra-bâtiment et transmission haut-débit pour les communications optiques dans le spectre visible." Thesis, Ecole centrale de Marseille, 2016. http://www.theses.fr/2016ECDM0005.

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Les communications optiques dans le spectre visible (VLC pour Visible-Light Communications) ont attiré une attention particulière depuis quelques années en tant qu'une solution prometteuse pour les réseaux sans fil à très haut-débit dans les milieux intra-bâtiment. Ainsi, cette technique exploite l'infrastructure d’éclairage basée sur les diodes électroluminescentes (LED) pour la transmission de l'information. Pour cette raison, elle offre de nombreux avantages, comparée aux techniques « classiques » basées sur les transmissions radiofréquences (RF), tels que l'existence d'une grande largeur d

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Дубицька, Марія Сергіївна, Мария Сергеевна Дубицкая та M. S. Dubyts’ka. "Вдосконалення способу прогнозу диз’юнктивних порушень методом акустичної геолокації при відпрацюванні пологозалягаючих вугільних пластів". Thesis, Видавництво НГУ, 2014. http://ir.nmu.org.ua/handle/123456789/3692.

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У дисертації вирішене актуальне науково-технічне завдання підвищення ефективності прогнозу мілкоамплітудних геологічних порушень вугільних пластів методом неруйнівного контролю до 95%. Запропонована і обґрунтована математична модель розповсюдження акустичного хвильового пакету в дисперсійному породному середовищі, заснована на інформаційній амплітудно-фазовій модуляції несучих частот зондуючого сигналу. Розроблено ефективний спосіб прогнозу прихованих диз'юнктивів у вугільних пластах методом неруйнівного контролю. У його основу покладено аналіз особливостей прояву розривних геологічни

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Muševič, Sašo. "Non-stationary sinusoidal analysis." Doctoral thesis, Universitat Pompeu Fabra, 2013. http://hdl.handle.net/10803/123809.

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Muchos tipos de señales que encontramos a diario pertenecen a la categoría de sinusoides no estacionarias. Una gran parte de esas señales son sonidos que presentan una gran variedad de características: acústicos/electrónicos, sonidos instrumentales harmónicos/impulsivos, habla/canto, y la mezcla de todos ellos que podemos encontrar en la música. Durante décadas la comunidad científica ha estudiado y analizado ese tipo de señales. El motivo principal es la gran utilidad de los avances científicos en una gran variedad de áreas, desde aplicaciones médicas, financiera y ópticas, a procesado de rad

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Reese, Lorie. "Laryngeal-level amplitude modulation in vibrato /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1535.pdf.

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Reese, Lorie C. "Laryngeal-Level Amplitude Modulation in Vibrato." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/767.

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Research in vocal vibrato has established that vocal tract filtering is primarily responsible for the amplitude modulation (AM) present in Western classical vibrato. Using electroglottography (EGG) and the EGG speed quotient, which is sensitive to fluctuations in the amplitude of vocal fold vibration, AM was detected at the laryngeal (source) level, in addition to the subsequent AM which results from vocal tract filtering. Seventeen classically-trained opera singers sang vowels in three pitch and loudness conditions. EGG and microphone measurements of FM and AM and their rates, extents, and pe

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Jakobsson, Anders. "Amplitude path for a polar modulation transmitter." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-96252.

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this is master tesis on characterisation and implementation of amplitude path for a polar modulation transmetter, targeted at bluethooth extended data rate ( EDR).bluethooth EDR uses quadrature modulation techniques to obtain higher data rates. these techniques use ampitude an phase modulation of a carrier to increas bitrate without increasing signal bandwidth compared to anly using amplitude or phas modulation. the amplitude path migjt be futher developed by investigating the use of higjer order anti-elaising filters together with group compesation. alternative solutions for the I/V-stage is

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Achelengwa, Edison M. "Emona-based interactive amplitude modulation/demodulation iLab." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/66402.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 76-78).<br>The MIT iLab Project has developed online laboratories (iLabs) which are lab stations that can be accessed and controlled remotely over the Internet. With iLabs, students can conduct real experiments on real equipment over the Internet. With the introduction of the National Instrument's Educational Laboratory Virtual Instrument Suite, NI ELVIS, in the development of iLabs, students to

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Gao, Jason. "Equalisation for carrierless amplitude and phase modulation." Thesis, Curtin University, 2002. http://hdl.handle.net/20.500.11937/233.

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Carrierless amplitude and phase (CAP) modulation is generally regarded as a bandwidth efficient two-dimensional (2-D) passband line code. It is closely related to the pulse amplitude modulation (PAM) and quadrature amplitude modulation (QAM) schemes. CAP has been proposed for various digital subscriber loop (DSL) systems over unshielded twisted pairs of copper wires. In this thesis, our main focus is on the minimum mean-square error (MMSE) performance of the ideal (i.e., infinite length) linear and non-linear (decision feedback) CAP receivers/equalisers in the presence of additive, coloured Ga

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Gao, Jason. "Equalisation for carrierless amplitude and phase modulation." Curtin University of Technology, Western Australian Telecommunications Research Institute (WATRI), 2002. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=14683.

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Carrierless amplitude and phase (CAP) modulation is generally regarded as a bandwidth efficient two-dimensional (2-D) passband line code. It is closely related to the pulse amplitude modulation (PAM) and quadrature amplitude modulation (QAM) schemes. CAP has been proposed for various digital subscriber loop (DSL) systems over unshielded twisted pairs of copper wires. In this thesis, our main focus is on the minimum mean-square error (MMSE) performance of the ideal (i.e., infinite length) linear and non-linear (decision feedback) CAP receivers/equalisers in the presence of additive, coloured Ga

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Chakraborty, Arup Lal. "Calibration-free wavelength modulation spectroscopy with elimination of residual amplitude modulation." Thesis, University of Strathclyde, 2010. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=14437.

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Torres, Wade Patrick. "Generalized frequency modulation." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8697.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.<br>Includes bibliographical references (p. 127-128).<br>In frequency modulation (FM) systems, a continuous-time information signal is modulated onto a sinusoidal carrier wave by using the information signal to modulate the frequency of the carrier wave. In this thesis, a more general type of modulation is developed, of which FM is a special case, that we refer to as rate modulation. A rate modulation system consists of a dynamical system whose rate of evolution is varied in propo

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Colaux, Henri. "Investigating sensitivity improvement methods for quadrupolar nuclei in solid-state nuclear magnetic resonance." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/9628.

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The study of quadrupolar nuclei using NMR spectroscopy in the solid state significantly increased in popularity from the end of the 20th century, with the introduction of specific methods to acquire spectra free from the effects of the quadrupolar interaction, that results in broadened lineshapes that cannot be completely removed by spinning the sample at the magic angle (MAS), unlike most of the other interactions present in the solid state. The first technique which allows, without any specific hardware, the removal of this broadening has been the Multiple-Quantum MQMAS experiment. The metho

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Grennek, David S. "Amplitude modulation using a nonlinear optical loop mirror." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA358980.

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Thesis (M.S. in Applied Physics) Naval Postgraduate School, December 1998.<br>"December 1998." Thesis advisor(s): Andres Larraza, H. Sarma Lakkaraju. Includes bibliographical references (p. 41). Also available online.

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Xu, Ruize Ph D. Massachusetts Institute of Technology. "Low-frequency, low-amplitude MEMS vibration energy harvesting." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115673.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 187-195).<br>Vibration energy harvesters work effectively only when the operating conditions match with the available vibration source. Typical resonating MEMS structures cannot be used with low-frequency, low-amplitude and unpredictable nature of ambient vibrations. Bi-stable nonlinear oscillator based energy harvesters are developed for lowering the operating frequency while widening the bandwidth, and are re

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Brooks, Lane Gearle 1975. "Amplitude and frequency demodulation controller for MEMS accelerometer." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8938.

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Thesis (M.Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.<br>Includes bibliographical references (p. 121-122).<br>Draper Laboratory is developing a high precision MEMS accelerometer. This thesis describes and analyzes the electronics which produce the acceleration estimate and control the actuators within the sensor. The Vector Readout method of amplitude and frequency demodulation is described and shown to be a high precision, environmentally stable method of demodulation. The Vector Readout method of demodulation uses a Hilbe

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Cheah, Victoria Vik Ee. "Prosodic rhythm in the speech amplitude envelope : amplitude modulation phase hierarchies (AMPHs) and AMPH models." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607862.

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Hofstad, Erlend Fagertun. "Ultrasound Contrast Imaging - Improved Tissue Suppression in Amplitude Modulation." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9316.

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<p>The ability to image myocardial perfusion is very important in order to detect coronary diseases. GE Vingmed Ultrasound uses contrast agent in combination with a pulse inversion (PI) technique to do the imaging. But this technique does not function sufficiently for all patients. Therefore have other techniques been tested out, including transmission of pulses with different amplitude (AM), to enhance the nonlinear signal from contrast bubbles. But a problem achieving sufficient cancellation of linear tissue signal is a feebleness of the method. In this diploma work has an effort been put i

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Malyska, Nicolas 1977. "Automatic voice disorder recognition using acoustic amplitude modulation features." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/30092.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.<br>Includes bibliographical references (p. 114-117).<br>An automatic dysphonia recognition system is designed that exploits amplitude modulations (AM) in voice using biologically-inspired models. This system recognizes general dysphonia and four subclasses: hyperfunction, A-P squeezing, paralysis, and vocal fold lesions. The models developed represent processing in the auditory system at the level of the cochlea, auditory nerve, and inferior colliculus. Recognition experiments usin

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Kaltenböck, Viktor. "Measurement system for low frequency and low amplitude AC voltage of given frequency." Thesis, Högskolan i Gävle, Elektronik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-30201.

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This work is about digital signal processing methods to be used to determine information of low frequency low amplitude signals of known frequency. Different adaptive filter concepts such as Wiener filter, NLMS filter and lock-in are implemented and compared to each other. The comparison carried out for different input signal amplitude and noise variance with the objective to find the best algorithm for noise cancelling. The comparison is done using a signal of interest combined with white noise as input to the filter element. The aim of the comparison is to find the most appropriate filter fo

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Donovan, Michael T. "Predistortion of quadrature amplitude modulation signals using Volterra series approximation." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA326919.

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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, December 1996.<br>"December 1996". Thesis advisor(s): Murali Tummala. Includes bibliographical references (p. 85-86). Also available online.

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Buenrostro, Christopher (Christopher B. ). "Efficient, low-distortion switch-mode power amplifier for amplitude modulation." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/84877.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, February 2011.<br>Cataloged from PDF version of thesis. "September 28, 2010."<br>Includes bibliographical references (pages 85-87).<br>Amplitude modulation systems are used in many areas of engineering, especially communication based disciplines. Typical systems have low-level signals which encode the desired information to be transmitted. These low-level signals are usually not of adequate power to transmit the desired information across a target medium, thus requiring modulatio

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Prodaniuc, Cristian. "Advanced Signal Processing for Pulse-Amplitude Modulation Optical Transmission Systems." Doctoral thesis, Universitat Politècnica de València, 2019. http://hdl.handle.net/10251/117315.

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[ES] Los sistemas de transmisión óptica no-coherente se emplean actualmente en las redes ópticas de corto alcance (< 80 km), como son las redes de ámbito metropolitano. La implementación más común en el estado del arte se basa en sistemas que emplean multiplexación por división en longitud de onda (WDM, wavelength division multiplexing) de cuatro longitudes de onda (¿) proporcionando un régimen binario de 100 Gbps (4¿×25 Gbps). En los últimos años, los sistemas de transmisión ópticos no-coherentes están evolucionando desde 100 Gbps a 400 Gbps (4¿×100 Gbps). Dado que este mercado comprende un g

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Eisele, Andreas. "PHASE AND AMPLITUDE MODULATED OFDM FOR DISPERSION MANAGED WDM SYSTEMS." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4178.

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Amplitude and phase modulated optical OFDM (Orthogonal Frequency Division Multiplexing) are analyzed in a 50GBit/s single channel and 40GBit/s 5 channel 512 subcarrier non-ideal dispersion-compensated fiber optic communication systems. PM-OFDM is investigated as an alternative to AM-OFDM to alleviate the problem associated with amplitude-modulated signals in a nonlinear medium. The inherent dispersion compensation capability in OFDM (using a cyclic prefix) allows transmission over a link whose dispersion map is not exactly known. OFDM also mitigates the effects of dispersion slope in wavelengt

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Wei, Jiaqi. "Magnetization manipulation induced by spin current and ultrafast laser." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0121.

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La manipulation de l’aimantation est un des sujets de recherche les plus étudiés dans le domaine de l’électronique de spin. Différentes méthodes de manipulations peuvent exciter les propriétés dynamiques de l’aimantation à différentes échelles de temps. Parmi les phénomènes dynamiques, la précession de l’aimantation et la désaimantation ultrarapide ont suscité un intérêt particulier. La fréquence de précession de l’aimantation est de l’ordre du GHz et correspond à une période de centaines de picosecondes. Cette précession est le mécanisme à l’œuvre dans les nano-oscillateurs à transfert de spi

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