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Two problems in signal quantization and A/D conversionJimenez, David January 2008 (has links)
Thesis (Ph.D.)--Mathematics, Georgia Institute of Technology, 2008. / Committee Chair: Yang Wang; Committee Member: Christopher Heil; Committee Member: Doron Lubinsky; Committee Member: Guillermo Goldsztein; Committee Member: Steven W. McLaughlin
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Principal components based techniques for hyperspectral image data /Fountanas, Leonidas. January 2004 (has links) (PDF)
Thesis (M.S. in Applied Physics)--Naval Postgraduate School, Dec. 2004. / Thesis Advisor(s): Christopher Olsen. Includes bibliographical references (p. 83-84). Also available online.
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Transporto triukšmo tyrimai Tauragėje / Analysis of transport noise in TauragėSkiriūtė, Daiva 02 August 2011 (has links)
Skiriūtė D. Transporto triukšmo tyrimai Tauragėje: Aplinkos inžinerijos bakalauro darbas/mokslinis vadovas lekt. R. Klimas; Šiaulių universitetas, Technologijos fakultetas, Statybos inžinerijos katedra. – Šiauliai, 2011. Didžiąją miesto triukšmo dalį (apie 80%) sukelia transportas. Transporto priemonės yra toks specifinis triukšmo šaltinis, kad jis įsiskverbia į bet kurią miesto teritoriją – gyvenamuosius ir pramonės rajonus, ligoninių ir sanatorijų zonas, miestų centrus, poilsio zonas. Transporto triukšmas sukelia diskomfortą ne tik gyventojams, bet ir įvairių įstaigų darbuotojams, vaikams, moksleiviams, gyvūnams. Tokio triukšmo padariniai žmonėms yra įvairios sveikatos problemos. Atliekant transporto triukšmo tyrimus Tauragės mieste pasirinkta 15 vietų: mokyklų, darželių–lopšelių, viešųjų tyliųjų miesto zonų, parkų, ligoninės, gyvenamųjų namų teritorijose. Gauti rezultatai lyginami su higienos norma, ir tai suteikia galimybę parašyti išvadas ir pateikti pasiūlymus triukšmo mažinimui. Mažinant transporto triukšmo sklaidą Tauragės mieste būtina taikyti triukšmo mažinimo priemones: mažinti automobilių eismą miesto centrinėje dalyje, įrengiant aplinkelį; riboti eismą gatvėse; įrengti dviračių ir pėsčiųjų takus; organizuoti viešojo transporto maršrutus ir dažniau juo naudotis; skatinti biotransporto naudojimą; plėsti dviračių takų tinklą. / Transport makes the major part (60-80%) of the city noise. The vehicle is the specific source of noise that it penetrates into any area – in residential and industrial areas, in hospitals and sanatoriums areas, in urban centers, and recreation areas. Traffic noise causes discomfort, not only residents but also the employees of the different companies, children, school children and animals. A range of health problems is effects of such noises to people. Performing the research of the traffic noise in Tauragė town 15 places were selected following: in the areas of schools, kindergartens, nurseries, public silent areas of the city, hospitals, and residential areas. The obtained results are compared with standards of hygiene, and this provides an opportunity to write conclusions and to make proposals for the prevention of noise. Reducing traffic noise in the dissemination in Tauragė town the noise reducing measures must be applied: to reduce automobile traffic in the central part of the town installing a bypass; to limit traffic on the streets; to install the bicycle and pedestrian paths; to organize public transport routes, and to use it more frequently; to construct the noise protection barriers.
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Stochastic Characterization And Mathematical Analysis Of Feedforward LinearizersCoskun, Arslan Hakan 01 January 2003 (has links) (PDF)
Feedforward is known to be one of the best methods for power amplifier
linearization due to its superior linearization performance and broadband stable
operation. However feedforward systems have relatively poor power efficiency and
are complicated due to the presence of two nonlinear amplifiers and the requirements
of amplitude, phase and delay matching within two different loops. In this thesis
stochastic characterization of a simple feedforward system with autocorrelation
analysis has been presented for Code Division Multiple Access (CDMA)
applications taking the amplitude and delay mismatches into consideration. It has
been assumed that, the input signal can be represented as Gaussian noise, main and
error amplifiers can be modeled with third order AM/AM nonlinearities and there
exists no phase mismatch within the loops. Hence closed form expressions, which
relate the main channel and distorted adjacent channel power at any point in the
feedforward circuitry to the system parameters, have been obtained. Consequently, a
mathematical handy tool is achieved towards specifying the circuit parameters
rapidly for optimum linearity performance and efficiency. The developed analytical
model has been verified by Radio Frequency (RF) and system simulations. An
alternative approach towards modeling feedforward systems for arbitrary signals has
also been brought into consideration and has been verified with system simulations.
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NVH analýza pohonné jednotky / NVH Analysis of the PowertrainMrózek, Jan January 2021 (has links)
This master thesis is focused on the diagnostics of vibrations and noise of an internal combustion engine. The work also includes a summary of the current state of knowledge in which the quantities used, transmission paths, measuring devices and the possibilities of performing frequency analysis are analysed. As part of the technical experiment on which this work is based, vibrations and noise on the tractor engine are measured. The obtained data are then further processed using the BK Connect program. Subsequently, a frequency analysis is performed, specifically an order analysis. The conclusion of the analysis consists of an evaluation of individual orders that cause excitation that occur in the investigated motor.
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Konstrukční návrh zkušebního stavu s uzavřenou smyčkou toku momentu pro experimentální ověření parametrů převodových ústrojí / Test Rig Design Proposal for the Experimental Validation of Transmission Parameters in Closed Loop Torque ConditionOtipka, Václav January 2018 (has links)
The thesis deals with the design of the experimental testing rig. Test rig is designed to measure NVH transmission parameters. First, basic knowledge of vibro-acoustic measurement is discussed. This is followed by an evaluation of the most commonly used power devices to derive real loads on measured gearboxes. In more detail, a back-to-back test rig is disassembled among other things. In the thesis are described two main components, which are composed of a connecting element and a test bench. Both components were optimized during the design due to their modal properties. Numerical modal analysis was performed in ANSYS Workbench software. The thesis also includes strength calculations performed using both numerical and analytical approaches. The indispensable result of the design work is the complete drawing documentation. Finally, measurements of vibrations and noise on the physically made connecting element assembly have been performed and subsequently evaluated.
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Nedourčená slepá separace zvukových signálů / Underdetermined Blind Audio Signal SeparationČermák, Jan January 2008 (has links)
We often have to face the fact that several signals are mixed together in unknown environment. The signals must be first extracted from the mixture in order to interpret them correctly. This problem is in signal processing society called blind source separation. This dissertation thesis deals with multi-channel separation of audio signals in real environment, when the source signals outnumber the sensors. An introduction to blind source separation is presented in the first part of the thesis. The present state of separation methods is then analyzed. Based on this knowledge, the separation systems implementing fuzzy time-frequency mask are introduced. However these methods are still introducing nonlinear changes in the signal spectra, which can yield in musical noise. In order to reduce musical noise, novel methods combining time-frequency binary masking and beamforming are introduced. The new separation system performs linear spatial filtering even if the source signals outnumber the sensors. Finally, the separation systems are evaluated by objective and subjective tests in the last part of the thesis.
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Snižování hluku kolejových vozidel v traťových obloucích / Reduction of noise of the railway vehicles in line arcsNavrátil, Václav January 2019 (has links)
reducing noise, noise in railway transport, management of application of products for modification of adhesion
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