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Spectral impuls signal analyzis
Měcháček, Radek ; Kubásek, Radek (referee) ; Fiala, Pavel (advisor)
Analysis signals, especially then pulsed signals and their next processing, today alreadyquaere to many different technological line. From communication engineering over telecommunication and acoustics, after as much as field - club application or multimedia. This work is introduction to the problems methods processing pulsed signals. Is distributive how from the standpoint of theory, so from look future application usage, by the help of programmatic analyses basic signals. Work bears basic description, notions, routes and method for work and analysis with widthspectral and ultraswidthspectral signals. Further be created tool for generation, filtration and near processing of several basic pseudo - random signals.
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Load effect on baroreflex sensitivity
Kamenec, Jan ; Čmiel, Vratislav (referee) ; Kolářová, Jana (advisor)
KAMENEC, J. Load effect on baroreflex sensitivity. Brno: Brno University of technology, Faculty of electrical engineering and communication, 2008. 52 p. Supervisor of bachelor’s thesis Ing. Jana Bardoňová, Ph.D. The aim of this baccalaureate thesis was study problems of the metering baroreflex and verify, whether the physical stress affects baroreflex sensitivity. The metering proceeded on the computer system Biopac, in which was projected the record of the metering. For the calculation was elected noninvasion spectral method. Measuring data by the computer system Biopac were processed by the help of the Matlab program that worked out found dependencies.
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Spectral analysis of the EEG signal
Blatný, Michal ; Kozumplík, Jiří (referee) ; Hrozek, Jan (advisor)
Master’s thesis deal about electroencefalography, measurement EEG signals and analysis measuermed signals. Project contains two basis practical parts. Firts part contain two PC’s programs that’s are used to fundamental analysis to frequence-domain and visual display of brain mapping created with Matlab. Second chapter of practical parts includes two PC’s programs created with LabView. First of them is the EEG biofeedback making use for advanced analyses and second program is used to detection segment of stacionarity.
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Solution of complex problems using evolutionary algorithms
Belovič, Boris ; Atassi, Hicham (referee) ; Burget, Radim (advisor)
Difficult problems are tasks which number of possible solutions increase exponentially or factorially. Application of common mathematical methods for finding proper solution in polynomial time is ineffective. Signal prediction is an example of diffucult problem. Signal is represented with a time serie and there is no explicit mathematical formula describing the signal. When genetic algorithms are applicated, they try to discover hidden patterns in time serie. These patterns can be used for prediction. Implication rules are used for discovery of these hidden patterns in time serie. Each rule is represented by one chromosome in population. Rules consist of two parts: conditional part and result part. Rules in population are compared with time serie and then the rules are evaluated according to their success in prediction. After the evaluation of rules, simulated evolution is started. Result of this evolution process is a group of rules which represent the most distinct patterns in time serie. These rules are then validated on validation set. Application is implemented in JAVA programming language.
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Computer analysis of sport matches
Židlík, Pavel ; Balík, Miroslav (referee) ; Atassi, Hicham (advisor)
This work deals with the possibility of a fast football match analysis from audio part of record with the possibility of implementation of some methods for other than football matches as well. The first intention was concentrated on detection of whiz of the soccer whistle that has specific frequency in its specter, which is out of common speech frequency. After detection harmonic frequency , the attention was focused on the definition of whiz meaning. Referee was helpful with the issue as he informed me about the number of whiz styles and provided me with referential samples for whiz classification. Neural network with back propagation was used for definition of whiz meaning. Another subject for detection of important moments of the match was concentration on the commentator’s basic tone. In case the commentator is really excited with the match, his basic speech tone automatically intensifies with every important action of the game. Analysis of commentator’s intensified basic speech tone was realized in this work too. Also the national hymns of teams playing against each other are a significant moment of the match. That is why detection of a hymn became another subject of analysis. Advantages of MFCC were used to obtain audio signal feature, from which 20 coefficients were gained. These were used as an entrance for classifier based on neural network with back propagation. For easy usage of these methods a graphic user interface with possibility of well-arranged look on gained results and also with possibility of replaying chosen section was created.
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Analysis of acoustic and electromagnetic emission signals
Boudný, Petr ; Káňa, Ladislav (referee) ; Sadovský, Petr (advisor)
Master´s thesis is focused to analyse the acoustic and electomagnetic emission signals. These signals generate external power applied on the material. This power put there plastic deformation and create cracks. Spectral analyse show that signals are non-stationary. Wavelet transformation was used to spectral analyse which informate about time-frequence vaules of the signal.
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HP89410A User Interface
Neužil, Jan ; Caha, Luděk (referee) ; Beneš, Petr (advisor)
The aim of this thesis was to develop user interface in LabVIEW to make typical measurements with spectral analyzer HP89410A There is introduced the theory of operation of an analogue heterodyne and a digital FFT spectral analyzer. It is explained the background of the Fast Fourier Transform. There are discussed the key settings in measuring with FTT analyzer, like window function, bandwidth, number of frequency points, or the averaging. Further is described the program, which was developed for measuring frequency characteristic by white noise and by stepped measurement. It was also made a module for measuring Signal to Noise Ratio and module for Total Harmonic Distortion. In the last part of this thesis are shown the results of processed exemplar measurements.
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Multimedia language support of DSP in German
Škůrek, Pavel ; Vídenka, Rostislav (referee) ; Sigmund, Milan (advisor)
The aim of the work is to provide a German speaking student with a simple and well-arranged list of terms, that appear in the sphere of mathematics, physics and the digital signal processing. Each terms are not explained in a difficult way. Mostly, there is only the basic definition, what the term means, or his function. This mean that this work can´t be taken as a textbook, but only a first aid for a funbling student. The work id divided into 3 databases. The first database Mathematik contains the list of all mathematical terms and relations at the level of secondary school. The database contains these chapters: Grundbegriffe, Mathematische Logik, Funktion, Trigonometrie des rechtwinkligen Dreiecks, kongruennte Darstellung im Ebene, ähnliche Darstellung im Ebene, Trigonometrie, komplexen Zahlen, Logarithmus, Vektor, analytische Geometrie, Folge, Differenzrechnung und Integralgleichung, Matrizen, Determinante, Kombinatorik a Wahrscheinlichkeit. The second database Physik contains the basic physical quantities, the student should know before entering the university. The database contains these chapters: Kinematik, Dynamik, Mechanik der starken Körper, Mechanik der Flüssigkeit, Elektizität, Magnetismus, Optik and Thermodynamik. The last database DSP is divided into 4 parts. It is divided by functionals blocks of each transmission and it is explaining each terms. They are Antialiasing, Analog-digital Wandler, Digital-analog Wandler and Spektral analysis. By this database, there is well-arranged czech - german and german - czech dictionary. These 3 databases are worked by the programm C++ Builder. The user can open each databese separately. All databases contain functions like for example searching, viewing the terms by tree structure, similar themes and so on. In the last database the user can add and change his own terms.
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The influence of computer games on aggressiveness
STANĚK, Jakub
This Bachelor Thesis deals with study of influence of computer games on aggression. The aim of this thesis is to find out whether computer games cause inclination to aggressive behaviour. The theoretical part is focused on scanning electrical brain activity. It contains description of electroencephalography, evoked potentials and brain waves. It also elaborates various psychological theories of aggression and connects them to relation with physiologist creation of aggressive behaviour. The empirical part is focused on a research project. It describes an experiment which examines reactions to positive, neutral and negative visual stimuli before and after playing computer games by spectral analysis. 42 people, chosen by quota selection, participated in the research. 29 probands got into the final analysis and outcomes. The data were processed by Matlab program and its toolbox EEGlab. The outcomes of spectral analysis and comparison of individual research groups show that violent computer games influence aggression.
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