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Musical multi effects analysis
Masár, Igor ; Kubásek, Radek (referee) ; Friedl, Martin (advisor)
This work deals with guitar effect and guitar sound in general. Most widely used effects are described as well as their output time courses are simulated. There is a comparison of analog and digital effects. There is also explained the principal of guitar multiefects, described all parts of guitar efect chain and determined key parameters, which has the main impact on quality of final sound. It is used to describe a methodology for measuring multi-effects and the results obtained by this measurement. The last part deals with psychoacoustic measurements.
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Measurement of gradient magnetic field decay in MR tomograph
Kubásek, Ondřej ; Kubásek, Radek (referee) ; Bartušek, Karel (advisor)
The objective of my thesis is to measure magnetic field gradient decay in an MR tomograph, process and evaluate the data measured and analyse the issue. The theoretical section focuses on the reasons for the gradient distortion which has a negative impact on NMR measuring techniques and it also describes options to eliminate the negative effects, focusing mainly on pre-emphasis filtration. It also lists methods of gradient magnetic field measuring. The practical section contains results of magnetic field decay measurements taken with the tomograph in the Institute of scientific instruments of the Academy of sciences in Brno using the method of instantaneous frequency with and without pre-emphasis compensation. The data are processed with MAREVISI and MATLAB programmes. MATLAB is used to develop a modern method of filtration to eliminate noise in useful signal leading to more accurate measurements of MR magnetic fields. This filtration uses a method of time-dependent variable thresholds and two-channel filter banks. MATLAB is also used to design a programme for approximation of the measured gradient magnetic field decay. The decay must be approximated in order to obtain time constants and the degree of exponential decay, which serve to set up the pre-emphasis compensation.
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Laboratory measuring amplifier
Ševčík, Šimon ; Kubásek, Radek (referee) ; Friedl, Martin (advisor)
This project deal with laboratory measuring amplifier. At first it describes elements to build this equipment. Compares the advantages and disadvantages of available integrated circuits and their control. The experimental part of the work is devoted of own proposal and construction universal measuring amplifier controlled by microcontroller AVR.
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Image signal processing by wavelet
Slávik, Vladimír ; Gescheidtová, Eva (referee) ; Kubásek, Radek (advisor)
The first part of text introduces reader to basic theory of wavelet transform and its realization by filter banks. WT of two-dimensional signals is shown and a particular application of WT in this domain - signal denoising, is discussed. The second part describes the application for image denoising realized in MATLAB from both user's and programmer's viewpoint.
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Lighting system for auditorium
Novák, Marek ; Kubásek, Radek (referee) ; Friedl, Martin (advisor)
V této bakalářské práci je uveden návrh a realizace osvětlovacího systému, který svou specifikací překonává možnosti široce rozšířeného protokolu DMX512/RS485. Dále jsou zde popsány omezení tohoto protokolu a také protokolů CAN bus a 100BASE-TX. V závěru je pak navržena síťová topologie, která je vhodná pro řízení daného počtu koncových prvků, spolu se samotným koncovým prvkem (řízeným světlem).
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Image data processing
Hamada, Adam ; Říha, Kamil (referee) ; Kubásek, Radek (advisor)
The main aim of this bachelor‘s thesis was the design of measure system and position detection method of one-shot plot in two axis system in cooperating with PROTOTYPA company. Also includes principle describe method which scanning fast moving object by high-speed CCD sensors. Further this thesis describing two algorithms for real-time process CCD video signal and in the end are selected components for this algorithms.
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Measurement of dynamic quality of gradient magnetic fields
Kabrda, Miroslav ; Kubásek, Radek (referee) ; Bartušek, Karel (advisor)
In the first chapter of bachelor thesis I focused on description the tomograph construction. The next chapter deals with the measurement of gradient magnetic fields, using methods based on instantaneous frequency. The thesis describes: the IF method, the IFSE method ( the method of measuring the instantaneous frequency of the spin echo), the IFSES method (the instantaneous frequency measurement method for a series of spins) and the method of Gradient decay measurement in NMR tomography. Each method describes the basic principles of the measurement, the excitation pulse sequence, obtainment of instantaneous frequency and the method of evaluation of the obtained signal. This bachelor thesis includes experimental measurements using the method of Gradient decay measurement in NMR tomography. The experimental data obtained are given and evaluated in the last chapter at the end of the thesis.
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Mikroprocesor control for laboratory power source
Hauer, Petr ; Kubásek, Radek (referee) ; Szabó, Zoltán (advisor)
This bachelor thesis aims to design and implementation a laboratory power supply controlled by microprocessor and PC via USB. The theoretical part describes the USB bus and the manner of its implementation to the microprocessor. There are the basic types of switching and linear sources and methods of control by a microprocessor. The practical part deals with the design and implementation of the resource. The results of this work are the themes of control and power part of power supply, printed circuit boards, software for the PC and microprocessor and measurements on the completed source.
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Non destructive sensors for measurement of the very slow change of the biological structure dimensions
Kostka, Filip ; Kubásek, Radek (referee) ; Friedl, Martin (advisor)
The aim of this thesis is to record a very small increment of the perimeter trees in one day using dendrometr. As the sensor is used tensometer strain gauge, which the deformation of its shape also changes its resistance and it is used subsequently to monitor the recording of growth. Data from dendrometr are handles by digital multimeter, which is synchronized with the PC, where further processing occurs date. This semester project also deals with the thermal expansion of metal parts of dendrometr and ambient conditions during the experiment.
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Impulse generator
Buš, Ondřej ; Drexler, Petr (referee) ; Kubásek, Radek (advisor)
This thesis deals with the question of generating very short voltage impulses. At first it considers the most used behaviors of impulses and their mathematical description. Then it covers various principial circuit connections, which are used for generating short impulses. There is a scheme of controlled generator described in detail in this work, which is being used for exciting the forming circuit. Part of this work is also a description of program equipment, scheme of connection with designed desk of printed circuit. Description of construction of three shape circuits based on theoretical findings follows. Every solution is compared to each other upon time and frequency domain.
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