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Dissertations / Theses on the topic 'Frequency Modulation (FM)'
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1
Pattichis, Marios Stephanou. "AM-FM transforms with applications /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
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Tuthill, John D. "Frequency dependent digital compensation in DSP based FM modulators." Curtin University of Technology, Australian Telecommunications Research Institute, 2000. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=9787.
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This thesis reports original work on digital compensation for frequency dependent transfer characteristics and errors in digital PAM/CPFSK (Pulse Amplitude Modulation/Continuous Phase Frequency Shift Keying) quadrature modulators.A particularly flexible and cost effective approach to the implementation of the base-band section of a radio transmitter is to synthesise base-band signals digitally using a DSP (Digital Signal Processor). This approach is limited, however, by the transfer characteristics and errors in the implementation of practical analogue sub-systems. These practical limitations result in undesirable in-band frequency-dependent shaping of the transmitted signals. In the case of FM (Frequency Modulation) signals, this leads to the generation of unwanted side-lobes in the transmitted RF signal spectrum that interfere with signals in adjacent frequency channels. This results in the transmitted signal failing to meet transmission standards requirements.The digital compensation techniques developed and presented in this thesis allow the reduction of undesirable in-band frequency-dependent signal shaping. It is shown that this enables strict requirements on the spectral emissions from the FM transmitter to be met using a flexible and cost effective DSP based modulator system.The contributions of the thesis are in three primary areas:(i) The development of a structure for frequency dependent digital compensation.(ii) The formulation and solution of an optimisation problem that allows the free parameters within the structure to be determined such that effective reduction of unwanted in-band frequency-dependent signal shaping is achieved.(iii) The development of techniques that allow the digital compensation procedure to be successfully implemented on a practical DSP platform.The new digital compensation structure that is proposed uses two digital FIR (Finite ++Impulse Response) filters in the digital base-band section of the quadrature modulator: one in the in-phase (I) channel and one in the quadrature (Q) channel. The tap-weights of the FIR filters are determined by solving two optimisation problems: one for each channel. The optimisation problems are formulated using a new approach that ensures that the degrees of freedom in the optimisation i.e., the FIR filter tap-weights, are used effectively to meet the objective of reducing in-band frequency-dependent signal shaping in analogue sub-systems further down the transmission path.A characterisation of the solutions to the optimisation problems enables the identification of techniques that need to be adopted to successfully implement the proposed digital compensation on a practical DSP-based system.The digital compensation technique is demonstrated by implementing and testing the technique on a DSP platform. The results of experimental studies are presented which clearly demonstrate that the digital compensation technique leads to substantial reductions in adjacent channel interference.
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Gallupe, Gary. "FM, PM and NPR Calculations." International Foundation for Telemetering, 1993. http://hdl.handle.net/10150/608853.
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International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, NevadaSystem performance can be ascertained via a number of parameters; one of which is Signal-to-Noise ratio (SNR). SNR is the ratio of the value of the signal to the value of the noise. It is generally expressed in decibels and usually a function of the system bandwidth. Another measure of performance is the Noise-Power ratio (NPR). NPR is the ratio of the noise level within a specific measurement channel when noise is applied to all channels, to the level that is measured within the specific channel with noise applied to all of the channels but not the specific channel.
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Svensson, Ake, and Michael Maoz. "HIGH SHOCK, COMPUTERIZED, MINIATURE, AIRBORNE PCM/FM TELEMETRY SYSTEM." International Foundation for Telemetering, 1989. http://hdl.handle.net/10150/614501.
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International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, CaliforniaAydin Vector Division has developed and manufactured an airborne, high shock, wideband FM/FM telemetry system for Saab Missiles AB in Sweden. This system was presented in the ITC Proceedings of 1988, Volume XXIV, pp 71-84 (Ref [1]). Three such systems were supplied. Saab Missiles AB also awarded Aydin Vector Division with an additional order for a larger number of high shock, computer based, specially designed, miniature PCM/FM airborne telemetry systems. These systems were developed, manufactured and supplied to Saab Missiles AB, and have been extensively and successfully used in the Swedish program. The PCM/FM telemetry package described in this paper was used for the system testing and the firing trials program of a mortar projectile, where the measurement requirements included micro processor interfaces, as well as a high amount of analog and bi-level data channels. The paper covers the specifications of the PCM/FM system mentioned above, the concept that was used to meet these specifications, the system’s mechanical and electrical design, the packaging technique and some of the test results.
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Rosenthal, Glenn K. "A DSP IMPLEMENTED DIGITAL FM MULTIPLEXING SYSTEM." International Foundation for Telemetering, 1991. http://hdl.handle.net/10150/613103.
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International Telemetering Conference Proceedings / November 04-07, 1991 / Riviera Hotel and Convention Center, Las Vegas, NevadaRecent advancements in high-speed Digital Signal Processing (DSP) concepts and devices permit digital hardware implementation of relatively high-frequency signal processing, which formerly required analog circuitry. Systems utilizing this technology can provide a high degree of software programmability; improved reproducibility, reliability, and maintainability; immunity to temperature induced drift errors; and compare favorably in cost to their analog counterparts. This paper describes the DSP implementation of a software programmable, digital frequency multiplexed FM system providing up to 4 output multiplexes, containing up to 36 subcarrier channels extending up to 4 MHZ, and accommodating modulating frequencies up to 64 kHz. System overall design goals and the implementation of these goals are presented.
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Law, Gene, and Don Whiteman. "IFM EFFECTS ON PCM/FM TELEMETRY SYSTEMS." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607378.
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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, CaliforniaIncidental Frequency Modulation (IFM) products in telemetry transmitters can be a significant cause of bit errors in received Pulse Code Modulation/Frequency Modulation (PCM/FM) telemetry data. Range Commanders Council (RCC) and other documents give little or no guidance as to acceptable levels of IFM for telemetry applications. The expected higher vibration levels of future high velocity missile systems means that IFM levels are likely to be higher than previously encountered. This paper presents measured data on Bit Error Rate (BER) versus IFM levels at given Signal to Noise Ratios (SNR’s) for PCM/FM telemetry systems. The information presented can be utilized with BER versus SNR plots in the Telemetry Applications Handbook, RCC Document 119, to determine the additional link margin required to minimize IFM effects on telemetry data quality.
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Boström, Henrik. "An FPGA implementation of a digital FM modulator." Thesis, Linköpings universitet, Elektroniksystem, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-70241.
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The increase in speed and density of programmable logic devices such as Field Programmable Gate Arrays (FPGA) enables ever more complex designs to be constructed within a short time frame. The flexibility of a programmable device eases the integration of a design with a wide variety of components on a single chip. Since Frequency Modulation (FM) is an analog modulation scheme, performing it in the digital domain introduces new challenges. The details of these challenges and how to deal with them are also explained. This thesis presents the design of a digital stereo FM modulator including necessary signal processing, such as filtering, waveform generation, stereo multiplexing etc. The solution is comprised of code written in Very high speed integrated circuit Hardware Description Language (VHDL) and a selection of free Intellectual Property (IP)-blocks and is intended for implementation on a Xilinx FPGA. The focus of the thesis lies on area efficiency and a number of suggestions are given to maximize the number of channels that can be modulated using a single FPGA chip. An estimation of how many channels that can be modulated usingthe provided FPGA, Xilinx XC6SXL100T, is also presented.
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Padilla, Marc Anthony. "FM Demodulators in Software-Defined Radio Using FPGAs with Rapid Prototyping." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2718.
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With the advent of software-defined radio, many radio applications have and are currently being designed for FPGAs, due to their high performance and reconfigurability. Invariably, "legacy" waveforms, such as FM, will need to be supported in such systems. A challenge that comes with programming FPGAs is the increased design and implementation time over conventional software programming. In this thesis, three FM demodulator techniques are implemented and compared in an FPGA. Two techniques are found to have similar SNR performance while having very different FPGA implementation characteristics. Library based design is explored for demodulators to increase FPGA design productivity. A block library is created and verified by use in tested demodulator designs. Two design tools that aim to increase design productivity in FPGAs, Ogre and HMFlow, are also examined and used to implement FM demodulators in a PCM/FM receiver design. Ogre leverages the demodulator block library, along with accompanying metadata, to decrease design time significantly. Design performance is not sacrificed when using Ogre. HMFlow, which relies on finer-grained blocks, reuses block implementation data to speed up implementation of the full design. The implementation of the HMFlow demodulator design is sped up by 3x but, when compared with the standard flow, produces an implementation with a reduced maximum clock rate (about 1/2) and with slightly more resources (about 6%). When comparing Ogre with HMFlow, the coarser-grained blocks of Ogre provide a more efficient design experience than that of HMFlow.
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Honglin, Yang, and Yang Yonghui. "TECHNOLOGY ON TRANSMITTING A SINGLE SUPER FAST WAVEFORM SIGNAL IN REAL-TIME." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607374.
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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, CaliforniaThis paper describes the technology on transmitting a single super fast waveform signal in real-time and introduces the general situation of the telemetry transmitter in vehicle. The equipment is a FM system in view of RF frequency, it is a pulse system in view of RF power. This equipment can transfer not only super fast waveform signals but also slowly varying conventional telemetry signals. The design is very novel. It is a multi-usage telemetry transmitter in vehicle.
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Papich, William J. "THE USE OF TELEMETRY IN AN ELECTROMAGNETIC TEST ENVIRONMENT." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/607292.
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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, NevadaThe U.S. Army Redstone Technical Test Center (RTTC) uses telemetry as a vital part of its data acquisition and analysis for electromagnetic environmental effects developmental testing of U.S. Army weapon systems. Testing in an electromagnetic environment poses several unique challenges. These challenges have resulted in the development of highly customized telemetry and data acquisition systems. This paper discusses the design and integration of past and current telemetry needs to incorporate real-time or near real-time simulations or scene generations into the testing process.
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Dubbert, Dale F. "The RMS phase error of a phase-locked loop FM demodulator for standard NTSC video." Thesis, Kansas State University, 1986. http://hdl.handle.net/2097/9911.
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Kováč, Marek. "Digitální AM/FM vysílač." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220601.
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This master thesis is focused on the theoretical description and practical implementation of software defined transmitter. The main aim of this thesis was made the prototype of software defined transmitter in FM band. Theoretical part is determined to description of basic parts of equipment and working principles to understand the basic principle of digital transmitters and define the appropriate component base for construction. Discussed are used types of A/D and D/A converters, blocks of digital signal processing and the roles, which these components performs. The second part is focused practical. Specified are suitable types of components and block diagram is proposed for following electrical connection and printed circuit board in Eagle program as a plug-in modul for developmental platform Arduino. The main point is program, which sets and controls the transmitter. Next important part is impedance match and antenna tuning, which is explain in practical part of thesis. The result is prototype of software defined transmitter compatible with Arduino Uno platform.
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Law, Eugene, and Kamilo Feher. "FQPSK VERSUS PCM/FM FOR AERONAUTICAL TELEMETRY APPLICATIONS; SPECTRAL OCCUPANCY AND BIT ERROR PROBABILITY COMPARISONS." International Foundation for Telemetering, 1997. http://hdl.handle.net/10150/609732.
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International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, NevadaThe aeronautical telemetry community is investigating alternative modulation methods to the commonly used non-return-to-zero (NRZ) pulse code modulation (PCM)/frequency modulation (FM). This paper outlines the important characteristics being investigated. Measured data comparing the spectral occupancy and bit error probability (BEP) performance of PCM/FM with that of a prototype constant envelope Feher’s quadrature phase shift keying (FQPSK) modulator and demodulator will also be presented. Measured results in several radio frequency bands demonstrate that the 99.99% and -60 dBc bandwidths of filtered FQPSK are only approximately one-half of the corresponding bandwidths of optimized PCM/FM even when the signal is non-linearly amplified. The signal energy per bit to noise power spectral density (E /N ) required for a BEP of 1×10 b 0 -5 for non-optimized FQPSK was approximately 12 dB which is approximately the same as limiter discriminator detected PCM/FM.
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Nguyen, Huong Thi Thien. "The impact of frequency modulation (FM) system use and caregiver training on young children with hearing impairment in a noisy listening environment." Diss., University of Iowa, 2011. https://ir.uiowa.edu/etd/1165.
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The two objectives of this single-subject study were to assess how an FM system use impacts parent-child interaction in a noisy listening environment, and how a parent/caregiver training affect the interaction between parent/caregiver and child. Two 5-year-old children with hearing loss and their parent/caregiver participated. Experiement 1 was conducted using an alternating design measured three communication behaviors (e.g., child's vocalization, parent/caregiver's initiation, and parent/caregiver's response) across four listening conditions (e.g., HA+Quiet, HA+Noise, FM+Quiet, and FM+Noise). Experiment 2 was conducted using a comparison within and between conditions to re-measure the communicative behaviors across the listening conditions after the parent/caregiver training. Findings of this study point to three major conclusions. First, FM system use (i.e., FM-only mode) facilitated FM01 child's ability to maintain same level of interaction in a noisy as good as in a quiet environment. Second, parent/caregiver training enhanced the impact of FM system use for one child (FM01), although parent/caregiver initiation increased for both. Third, it is important to verify the function of both FM system and HA microphones to ensure access to FM advantage.
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Juřica, Lukáš. "Automatické měření odstupu motorových vozidel." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218403.
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This work deals with evaluation of equipment used for non-contact measurement of distance between vehicles. First are discussed various principles of measuring and after the selection of the most appropriate solution is proposed a detailed block diagram of modulation, demodulation and evaluation of the whole system and its mathematical description. Another part is devoted to describing the activities of the microprocessor controller, with which is controlled evaluation part and to the control program. It also analyzes the maximal attainable accuracy of measurement and the errors that affect it. The last part includes a circuit design and simulation of selected functional block, which is a coincidence /quadrature/ detector and construction documents for evaluation and demodulation part of the measurement instrument.
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Šrámek, Petr. "Implementace softwarového rádia do FPGA." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217786.
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The common objective of this project is implementation of software defined radio (SDR) into FPGA. The text contains review and comparison of several hardware concepts intended for SDRs implementation then the methods for digital implementation of various components of radios as the filters, mixers and others are mentioned. Part of the text introduces used hardware platform and describes software support for designing, simulations and implementation into hardware. Significant part of project describes complex of external hardware components as filter, amplifier and control panel designed and built within the project realization. But the main part of project demonstrates design of the software solution of radio receiver. There is specified architecture of radio for FM broadcast receiving, next the more complex systems with carrier recovery algorithm are presented. These systems are able to work with AM, BPSK and QPSK modulations. It is possible to implement all these receivers into hardware and verify their operation. The practical laboratory theme has been outlined within the project run.
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Bačík, Martin. "Simulátor funkce FM-CW dálkoměru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219875.
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This thesis describes design of Simulator FM-CW range finders. It is choosing the optimal method of realization and inform about basic properties of continuous working radar. The work includes an analysis of errors in real rangefinder and a numerical estimate of the maximum error in real devices. Contains detailed block diagram of simulator FM-CW range-finder and computer simulation of function generator frequency modulated signal, demodulator. Further work includes the complete construction documents for the preparation and implementation of basic functional verification
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Mahmoudi, Madjid. "Corrélation entre essais de CEM sur table et essais sur véhicules d' équipements pour automobiles." Paris 6, 2005. http://www.theses.fr/2005PA066438.
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Dans l’industrie automobile, le nombre d’équipements électroniques ne cesse de croître alors que les temps de développement diminuent. Cette multiplication des équipements électroniques peut entraîner des phénomènes d’auto-perturbation dans les véhicules, notamment au niveau des récepteurs embarqués. Ceci se traduit par des parasites audibles au niveau des haut-parleurs de l’autoradio. Dans le but de prévenir ces effets indésirables, des essais en compatibilité électromagnétique (CEM) sur véhicule et sur les équipements isolés sont effectués. Dans chacun de ces essais, il s’agit de vérifier que le niveau de perturbation mesuré est inférieur à une limite acceptable. Les essais sur les équipements isolés ont pour objectif d’anticiper la validité des équipements lors des essais sur véhicule. Le travail de la thèse consiste à mettre au point une méthode permettant de calculer les limites à respecter lors des essais sur table, qui garantissent la validation des équipements lors des essais sur véhicule. La méthode a été validée dans un cas simple, et dans le cas d’un véhicule simplifié. Dans ce cas, nous avons utilisé la méthode des plans d’expériences pour tenir compte de la variabilité des configurations d’essais sur véhicule
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Bouloc, Jeremy. "Système de contrôle pour microscope à force atomique basé sur une boucle à verrouillage de phase entièrement numérique." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4307/document.
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Un microscope à force atomique (AFM) est utilisé pour caractériser des matériaux isolant ou semi-conducteur avec une résolution pouvant atteindre l'échelle atomique. Ce microscope est constitué d'un capteur de force couplé à une électronique de contrôle pour pouvoir correctement caractériser ces matériaux. Parmi les différents modes (statique et dynamique), nous nous focalisons essentiellement sur le mode dynamique et plus particulièrement sur le fonctionnement sans contact à modulation de fréquence (FM-AFM). Dans ce mode, le capteur de force est maintenu comme un oscillateur harmonique par le système d'asservissement. Le projet ANR Pnano2008 intitulé : ”Cantilevers en carbure de silicium à piézorésistivité métallique pour AFM dynamique à très haute fréquence" a pour objectif d'augmenter significativement les performances d'un FM-AFM en développant un nouveau capteur de force très haute fréquence. Le but est d'augmenter la sensibilité du capteur et de diminuer le temps nécessaire à l'obtention d'une image de la surface du matériau. Le système de contrôle associé doit être capable de détecter des variations de fréquence de 100mHz pour une fréquence de résonance de 50MHz. Etant donné que les systèmes présents dans l'état de l'art ne permettent pas d'atteindre ces performances, l'objectif de cette thèse fut de développer un nouveau système de contrôle. Celui-ci est entièrement numérique et il est implémenté sur une carte de prototypage basée sur un FPGA. Dans ce mémoire, nous présentons le fonctionnement global du système ainsi que ses caractéristiques principales. Elles portent sur la détection de l'écart de fréquence de résonance du capteur de forceAn atomic force microscope (AFM) is used to characterize insulating materials or semiconductors with a resolution up to the atomic length scale. The microscope includes a force sensor linked to a control electronic in order to properly characterize these materials. Among the various modes (static and dynamic), we focus mainly on the dynamic mode and especially on the frequency modulation mode (FM-AFM). In this mode, the force sensor is maintained as a harmonic oscillator by the servo system. The research project ANR Pnano2008 entitled: "metal piezoresistivity silicon carbide cantilever for very high frequency dynamic AFM" aims to significantly increase the performance of a FM-AFM by developing new very high frequency force sensors. The goal is to increase the sensitivity of the sensor and to decrease the time necessary to obtain topography images of the material. The control system of this new sensor must be able to detect frequency variations as small as 100mHz for cantilevers with resonance frequencies up to 50MHz. Since the state-of-the-art systems doe not present these performances, the objective of this thesis was to develop a new control system. It is fully digital and it is implemented on a FPGA based prototyping board. In this report, we present the system overall functioning and its main features which are related to the cantilever resonant frequency detection. This detection is managed by a phase locked loop (PLL) which is the key element of the system
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Hanzálek, Pavel. "Praktické ukázky zpracování signálů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-400849.
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The thesis focuses on the issue of signal processing. Using practical examples, it tries to show the use of individual signal processing operations from a practical point of view. For each of the selected signal processing operations, an application is created in MATLAB, including a graphical interface for easier operation. The division of the thesis is such that each chapter is first analyzed from a theoretical point of view, then it is shown using a practical demonstration of what the operation is used in practice. Individual applications are described here, mainly in terms of how they are handled and their possible results. The results of the practical part are presented in the attachment of the thesis.
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Ping-YenTsai and 蔡秉諺. "Simulation of the frequency-modulation (FM) saturation spectroscopy." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/15229528608872033264.
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碩士國立成功大學
光電科學與工程學系
104
Compared to direct absorption spectroscopy and wavelength modulation spectroscopy, frequency modulation (FM) spectroscopy employs a higher sensitivity of probe beam and it can simultaneously detect the absorption and the dispersion of the interest gas. Therefore, FM spectroscopy is widely used in atomic and molecular spectroscopy and trace gas detection. On the other hand, FM spectroscopy also is the key technology in the high sensitivity noise immune cavity-enhanced optical heterodyne molecular spectroscopy. Consequently, due to the simple scheme and high sensitivity of FM spectroscopy, it gradually becomes one of popular measurement technology. In order to reduce the noise from the laser light, FM spectroscopy has a very high modulation frequency, which can let the sidebands move away from the center frequency of laser light by more than tens of MHz modulation frequency. It is also used in the molecular spectroscopy and the optical frequency stabilization. In this thesis, I derive the detailed derivation of the FM principle and use the Taylor series expansion to simplify the equation. Then I use MATLAB to simulate the absorption and the dispersion of FM signal by Lorentizan profile, and normalize the profile at different modulation frequency. Finally, in order to match our experiment for FM saturated spectroscopy. I propose a FM saturation absorption model to compare the experimental data of methane and simulate the case of H3+ by changing different parameters, such as homogenous linewidth, modulation frequency and modulation index.
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Albertyn, Eben. "Channel characterisation and coding for the FM SST channel." Thesis, 2011. http://hdl.handle.net/10210/3944.
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M.Ing.The transmission of digital data at higher data rates and greater reliabilities is becoming increasingly more important in the society of today. The usage of, especially wireless digital data, is increasing at an alarming rate, and the need arises for more bandwidth to be made available for this purpose. Hence, the need arises to optimise and expand the usage of bandwidth currently under use. Existing wireless channels, such as the commercial FM service, need to be re-evaluated and unused bandwidth needs to be developed and used as close to capacity as possible. In this dissertation, a study was launched to develop the FM SST (Supplementary Signal Transmission) commercial analog service as a simplex digital channel that can commercially be used to transmit a myriad of digital data. With the help of a commercial FM radio channel, digital data was transmitted using a number of different modulation schemes to obtain channel measurements for the FM SST channel. The modulation scheme that performed the best, given certain criteria, was GMSK. This raw information was then used to extract first and higher order statistical information from the channel, in order to parameterise discrete channel models, based on a Markov process. The channel models that were used were the Gilbert, GilbertElliott and Fritchman channel models. These channel models were then tested according to their iirst and higher order statistical data to evaluate their effectiveness in modelling the error process on the FM SST channel. It was found that the channel model best approximating the real channels was the Gilbert channel. Once satisfactory results were obtained, these discrete channel models were then used to evaluate various error correction schemes for their ability to correct burst errors on the FM SST channel. From the various schemes evaluated, a (63,39) BCH with an interleaver of index 4 was found to perform the best. The purpose of which is to transmit digital data at the highest data rate possible and at the same time having a bit error rate less than lxl0-6.
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Li, Chao-Fang, and 李昭芳. "Doppler Free FM and Modulation Transfer Sepectroscopies of Cs and Laser Frequency Stabilization." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/38071915053352598921.
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碩士國立交通大學
光電工程研究所
86
In this thesis, we report our study of high resolution spectroscopy in atomic cesium vapor using narrow linewidth dilode lasers. Lamb-dip, FM and modulation transfer spectroscopies in a pump-probe geonmetry were employed to obtain Doppler free hyperfine transitions in Cs atom. FM and modulation transfer data are phase sensitive and contain informtion on both the real (absorptive) and imaginary (dispersive) parts of the transition susceptibilities. Theoretical treatment in the framework of . Maxwell-Bloch equations was carried out to compare with the experiment data. Analytical expressions for the Lamb-dip, FM and modulation transfer signals were derived using the third order perturbation approximation. Excellent agreement was found. We also applied the FM and modulation transfer techniques in stabilizing and locking laser frequency to the Cs hyperfine transitions.
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McNeal, Jeff D. "A comparison of two types of zero-crossing FM demodulators for wireless receivers." Thesis, 1998. http://hdl.handle.net/1957/33713.
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A comparison of two novel demodulators. The first is a basic zero crossing demodulator,
as introduced by Beards. The second is an approach proposed by Hovin. The two demodulators
are compared to each other and to the conventional method of demodulation.Graduation date: 1998
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Wang, Yuan-Hwa, and 王遠華. "The Study of the Optimum Tone Reproduction Curve using Frequency Modulation（FM）Screening Technique and FM Compare with AM the Dot Gain in the Offset Printing." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/86957009459647614117.
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"Error control coded data transmision over FM supplementary signal transmission radio channels." Thesis, 2015. http://hdl.handle.net/10210/14748.
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M.Ing. (Electrical and Electronic Engineering)With all the talk about the Information Highway and its construction, there is also a channel which is highly underestimated and thus almost ignored. On normal FM radio transmissions extra bandwidth exists, suitable for the transmission of audio and data. In this thesis the effects of interference on data transmission over the Supplementary Signal Transmission (SST) channel are analysed. The channel is characterized in terms of the Bit Error Rate (BER) versus field strength and distance from a transmitter ...
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Venkitaraman, Arun. "Generalized Analytic Signal Construction and Modulation Analysis." Thesis, 2013. http://etd.iisc.ernet.in/2005/3316.
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This thesis deals with generalizations of the analytic signal (AS) construction proposed by Gabor. Functional extensions of the fractional Hilbert Transform (FrHT) are proposed using which families of analytic signals are obtained. The construction is further applied in the design of a secure communication scheme. A demodulation scheme is developed based on the generalized AS, motivated by perceptual experiments in binaural hearing. Demodulation is achieved using a signal and its arbitrary phase-shifted version which, in turn translated to demodulation using a pair of flat-top bandpass filters that form an FrHT parir.
A new family of wavelets based on the popular Gammatone auditory model is proposed and is shown to lead to a good characterization of singularities/transients in a signal. Allied problems of computing smooth amplitude, phase, and frequency modulations from the AS. Construction of FrHT pair of wavelets, and temporal envelope fit of transient audio signals are also addressed.
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Ho, Show-Song, and 何壽松. "A Study of Conversational Broadcasting Station Management Strategies : Using the Segmentation Format Oriented Stations of Cheng Sheng Frequency Modulation （FM）Radio Station in Taipei as an Examples." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/50985504414050516626.
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碩士世新大學
傳播管理學系
92
As the local radio broadcast industry underwent a drastic revamp since 1993 following a series of ratio frequency deregulations by the government opening up opportunities to file for broadcast licensing, privately run radio broadcast stations have begun to thrive and eventually become mainstream in the broadcast business. As a majority of the emerging radio broadcast stations are of medium to small frequency powered radio stations, and as restricted by radio wave frequency projection, the service coverage tends to be limited to within a radius of 5 to 20 kilometers of a moderate range, yet with a relatively moderate scale of equipment investment and operating capital. At which, the number of legally registered radio stations has mushroomed in the past decade, presently there are a total of nearly 160 radio broadcast stations that are legally registered to compete the piece of the action and share the broadcast advertising pie. With a limited market scale, the radio broadcast industry finds itself enthralled in an unavoidable heated market competition as new operators rush to joint the marketplace in multiple numbers. As a result, it is not surprising that radio station operators would need to ponder how best to secure a nice market through business management thinking of audience segregation, professionalism and strategic pact. Managing an audience-specific market has benefited from diverse listening choices available to the mass audience, which in turn allow the broadcast industry to take to a diversified development feature to harbor content enrichment. Yet, notwithstanding the emerging force does contribute towards breaking down the once monopolistic industry dominated by a few powerful stations, coupled with certain loopholes in government regulations, the developing trend, nevertheless, has posed certain impact to the structure and landscape of the radio broadcast industry, and ramifications derived from the development only further accelerates business operating difficulties that test the wits of the radio broadcasters. The study aims to examine how the conventional radio broadcast stations confront a drastically fast-changing marketplace, and how they evolve in operating philosophy and mentality, and move to revamp their management and adjust their strategies, and some of the more drastic moves that they have sought in transforming from a mass broadcast market to an audience-specific market. A station that has successfully transformed itself into one positioned as a finance, economic and money-management oriented one has been taken as an example to further profile and examine the process through in-depth interviews and hands-on participation and field observations broaching from the practical viewpoint. One other objective has been to propose the author’s humble input and to contribute some of the study findings deriving from such type of station managing knowledge accumulated on some of the crucial focuses required for a radio broadcast station once focusing on mass audiences to transform itself into an audience-specific broadcasting establishment.