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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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Dynamic analysis of structure loaded seismic loads
Janošková, Lenka ; Nevařil, Aleš (referee) ; Vlk, Zbyněk (advisor)
In this diploma thesis the seismic load on two different models is solved – the first model is a beam hall and the second model is a multistory building. The calculation of seismic load was performed according to standard ČSN EN 1998-1 (Eurocode 8) using the response spectrum analysis and the method of equivalent static forces (substi-tute load). For the combination of seismic responses in different directions are used SRSS and CQC rules. Models and calculations were solved in a student’s version of program RFEM 4.10 (Ing. Software Dlubal, s.r.o.). The comparison of mentioned methods in each models, also the comparison of combinative rules in calculation and the final evaluation of seismic responses on both of models are the subject of this thesis.
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Spectral analysis of flute organ whistles and their comparison
Sommer, Tomáš ; Michálková Slimáčková, Jana (referee) ; Jirásek, Ondřej (advisor)
This work is focused on the problems of spectral analysis of flutes stops in organ pipes. The first part of this work is about terminology of organ pipes. This theoretical part is also focused on the problem of harmonic analysis with the use of mathematical signal processing methods, which allows this analysis. The second part of this work deals with measuring methods of specific organs and acquiring sound samples and their evaluation and spectrum description.
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Analysis of Time-Varying Spectrum of Pianos
Smělý, Pavel ; Rajmic, Pavel (referee) ; Jirásek, Ondřej (advisor)
This work focuses on an analysis of a time-varying spectrum of pianos. The beginning of the work deals with the gradual evolution of the piano, aiming at timbre and design, and it analyzes in detail its individual parts and their influence on the sound spectrum. The theoretical part also concentrates on the issue of harmonic analysis in both the musical conception of timber and the usage of mathematical signal processing methods that make this analysis possible. Another part deals with practical tasks of the work such as a description of an application and functions created in the interface of MATLAB for exploring the time-varying spectrum of tones, description of the method and procedure of the measuring of three concert grand pianos. The work also analyzes, by supporting it with practical examples and by comparing the measured pianos, the most important acoustic phenomena that originate from the production of tones in the instrument; it describes the timber of individual instruments, and it gives recommendations.
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The spectral and directional analysis of xylophone, vibraphone and glockenspiel
Hoffman, Pavel ; Indrák, Michal (referee) ; Jirásek, Ondřej (advisor)
Bacherlor‘s thesis deals with spectral analysis and directional characteristics of idiophonic instruments, xylophone, vibraphone and glockenspiel. It analyzes various details during spectral analysis, that could have an effect on the spectrum of a given instrument, and especially on its inharmonicity, thus analyzing its effect on the hardness of mallet, dynamics and the location of the mallet striking the bars (stones, wooden plates). It examines the changes in the harmonic range and the formant areas of instruments. The thesis further describes the mallets, the instruments themselves, theoretical base and the means by which the sound samples were acquired and processed.
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The tri-band fluorescent reader
Škrabalová, Denisa ; Čolláková, Jana (referee) ; Dostál, Zbyněk (advisor)
This bachelor thesis deals with the issue of laboratory testing and design of an optical instrument called a tri-band fluorescent reader, which is designed for fluorophores Alexa Fluor 488, Alexa Fluor 555 and Alexa Fluor 647. It contains a theoretical part with key knowledge not only in the natural sciences, such as physics, chemistry, biology, but also the current technical capabilities that are necessary for the practical part. In the practical part is drafting the objectives of the thesis, which are the measurement and evaluation of the samples examined using a monochromator, acquisition and evaluation of images using the existing system, build spectral analysis throughput, create a simulation of custom solutions and create a system engineering design. The mechanical model of the reader assembly was made after measuring the samples and the device and creating the simulation.
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Analysis and comparison of spectra in different piano models
Peloušek, Tomáš ; Přikryl, Lubor (referee) ; Jirásek, Ondřej (advisor)
This work focuses on the topic of analysis of the time varying spektrum of the piano. The introduction deals with the historical development of the piano, of its individual parts and the way they influence the tone colour. The subsequent theoretical part is focused mainly on the topic of spectral analysis in the musical concept of sound colours. In the following part a measuring of particular musical instruments is described, these experiments being conducted in an anechoic chamber provided by the instrument producer. It also lists the various methods and calculations used in the process and the conclusion presents analysis of acquired samples.
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Digital Signal Processor based Baby Cry Detector
Sobotková, Šárka ; Rozman, Jiří (referee) ; Sekora, Jiří (advisor)
The thesis discusses the baby cry. Processing of literary research in dealing with children crying and processing of audio signals. Based on information gathered propose an algorithm for detecting child's cry, which was verified using Matlab programming environment. Based on the identified parameters of the input signals and the proposed algorithms was selected appropriate digital signal processor. The hardware device was realized to detect and initialize the child crying, and its functionality has been verified in the recorded sound recordings child crying.
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Automated tuning of drive controller
Adamec, Matúš ; Pohl, Lukáš (referee) ; Blaha, Petr (advisor)
This thesis deals with automated tuning of drive controller. To achieve this goal, system identification is needed. Therefore, the issue of identification is described at the beginning of this thesis. Spectral analysis was selected from many described methods. It was implemented in Matlab and also in C# language where was used averaging and Blackman-Tukey method. The C# application is linked to Beckhoff TwinCAT 3 and TwinCAT 2 runtime sytems that enable connections with real drive. Next, the problem of drive regulation is discussed and the results of using spectral analysis on real drives are shown. At the end of the thesis is described the algorithm of setting the speed controller with different types of frequency converters.
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Sensorless velocity control and positions of d.c. low-power brush motor
Svoboda, Jan ; Hanák, Pavel (referee) ; Prajzner, Václav (advisor)
This bachelor's thesis focuses on sensorless control of low load brushed DC motor that is used in the actuators made by the Honeywell company. The first part provides an introduction into motor control and common used methods of speed and position sensing of brushed DC motor. Sensorless method of sensing described in this work is the detection of commutation pulses from the signal of motor current. These pulses are caused by brushes leaping over the commutator bars. Correct evaluation of commutation pulses can provide the information about velocity and position of the motor. This relatively new method of detection of commutation pulses is investigated and arising problems are demonstrated on measured samples of signal. Suitable methods of signal processing are then proposed. Infallibility of these signal processing methods is then proved on the set of signals measured under circumstances of supply voltage and abrasion. Then it is decided which signal processing method that sensorless control system can use is the best.
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