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Interactive web applications for teaching purposes in the field of signal processing
Kuba, Michael ; Rajmic, Pavel (referee) ; Záviška, Pavel (advisor)
This thesis deals with selected topics of signal processing. The aim of the project is the implementation of four interactive web applications in JavaScript, intended for teaching purposes. These applications deal with following topics: rational number resampling of the discrete signal, mean and root mean square signal values, discrete linear and circular convolution in 1D, and discrete cross-correlation. The thesis is divided into the theoretical and the practical part. There is a theroretical foreword of topics the applications deal with, including an introduction to signals followed by a description of functionality and the user interface of created applications.
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Application possibilities of LNVGA programmable amplifier
Sobotka, Josef ; Hanák, Pavel (referee) ; Jeřábek, Jan (advisor)
This thesis deals with the theoretical description of the qualitative characteristics and parameters of some modern active elements, also discusses the theory of signal flow graphs at the level applicable for the following frequency filter design methods. The thesis is also generally discussed the issue with the circuit simulator PSpice modeling theory and voltage amplifiers on the basic 6-levels. The practical part of the work is divided into two parts. The first practical part is dedicated to design four levels of simulation model of components LNVGA element. The second practical part contains detailed theoretical proposals for three circuit structures implementing the frequency filters 2nd order (based on the basic structure of the OTA-C) using signal flow graphs with configuration options of Q and fm based on the parameters of active elements in the peripheral structure and their verification with prepared LNVGA model layers.
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History of audio carriers and transmission of sound
Šimarová, Lucie ; Krhutová, Milena (referee) ; Šedrlová, Magdalena (advisor)
Cílem této bakalářské práce je popsat vývoj zvukových nosičů. Tato bakalářská práce poskytuje náhled do historie a současnosti zvukových nosičů. Nejprve seznamuje čtenáře s teorií přenosu zvuku. Tato část je zaměřena na přenos vlnění a popisuje rozdíly mezi vlnami. Následně jsou probírány analogové a digitální způsoby záznamu zvuku. Hlavní část práce se věnuje uchovávání hudby. Nejprve se práce zabývá uchováním hudby před mechanickým záznamem, tato část zahrnuje notaci, tabulatury a automatofony. V další části je již popsán mechanický záznam zvuku, a to v analogové formě. Poslední kapitola je zaměřena na digitální záznam zvuku. V neposlední řadě práce obeznamuje čtenáře s kulturním a hudebním vlivem jednotlivých nosičů. Znalosti jsou nabyty z různých zdrojů, především z literatury.
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Crossroads model
Záviš, Jan ; Roman, Foukal (referee) ; Štohl, Radek (advisor)
The topic of my bachelor thesis is The Model of Crossroads Systems with Light Signals. My bachelor thesis is divided into 3 parts. The first one is a theory where the issue of crossroads is described, especially focuses on light's signals. I have described specific ways of control and methods of realization such crossroads. Furthermore, project is focused on theirs timing of traffic fluency. The thesis also describes the hook-up of individual crossings not to avoid collapse in roads and traffics will be fluent. This is connected with changes in time delays depending on the traffic situation, for example rush hour. In addition, there is a general description of the crossroads as well, their division, advantages and disadvantages. The second part is focused on the design of a demonstration panel that will help as learning tools in the laboratory. This chapter contains a graphic design of a panel, a design of a control system scheme, a design of a PCB for a control system and the realization of a physical demonstration panel. In the project the issue of selecting a suitable source for the control system is analyzed. Furthermore, the thesis deals with the design of a universal code, which will serve as a template for various kinds of intersections. Finally, the issue of the initial recovery is addressed. Here comes the connection of the panel with the programmable automaton and the subsequent program upload.
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Monitoring of GSM network
Trávníček, Tomáš ; Krajsa, Ondřej (referee) ; Koutný, Martin (advisor)
This master’s thesis is focused on problems of monitoring GSM network using a mobile phone. Problems are analyzed on a theoretic basis with a description of available network parameters. Then the thesis offers a description of existing application environments providing a user with given data about the network. The main part of this work describes a development of application compiling queue data from mobile network and GPS, and creates output data illustrating signal strength in selected areas. The work also includes extensive measuring in select areas together with an evaluation of the processed data.
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Speech analysis using iOS or Android system
Hejda, Jakub ; Galáž, Zoltán (referee) ; Mekyska, Jiří (advisor)
The telemendicine is rapidly growing industrial branch and gives an opportunity of easier diagnosis needed for much more effective treating methods development. The aim is to develop a smartphone application for the diagnosis of prolonged phonation of pati- ents with Parkinson’s disease. Qt has been chosen s the main framework, allowing the multiplatform development using various combination of languages consisting of C++, QML, Java and JavaScript. Required functionality has been completely implemented. The application guides a user through the process of recording, then executes the analy- sis, saves data into database and displays the history into well-arranged charts, the user can also set a notification to remind him of a recording. The application can be compiled for all widely used mobile and desktop systems.
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Speech Recognition Algorithms in FPGA/DSP
Urbiš, Oldřich ; Herout, Adam (referee) ; Szőke, Igor (advisor)
This master's thesis deals with design of speech recognition algorithms with consideration of target technology, which is platform combinating digital signal processing and field programmable gate array. Algorithms for speech recognition includes: feature extraction of Melfrequency cepstral coefficients, hidden Markov models and their evaluation by Viterbi algorithm.
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Using repeaters to enhance cellular communication signals
Kubásek, Ondřej ; Kubánek, David (referee) ; Koutný, Martin (advisor)
This thesis examines possibile applications of RF repeaters to improve the mobile networks signal coverage. An overview of various types of repeaters is given, while advantages and disadvantages of particular types are discussed. The questions of antenna isolation and resulting repeater gain settings are solved here as well. The thesis also considers a proposal of repeater system to improve the signal coverage in the trains of the České dráhy, a.s. company. This proposal analyses the questions of signal penetration and propagation in trains, possibilities of implementing repeaters into carriages, system diagnostics and the financial issues. The proposal is supported by the results of a trial measurement taken out in the cooperation among T-Mobile Czech Republic a.s., Vodafone Czech Republic a.s., Telefónica O2 Czech Republic a.s., České dráhy a.s. (Czech Railways Company) a ČD-Telematika a.s. on the Prague – Ostrava line.
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LPC Speech Coding
Zapletal, Ondřej ; Kyselý, František (referee) ; Rajmic, Pavel (advisor)
The contents of the thesis "LPC speech coding" are studies of this method of a parametric source coding, explanation of mathematical procedures that are used in it (linear prediction, autocorrelation, Levinson-Durbin algorithm, transfer to a form suitable for transmission, Chebyshev root searching polynomial method) and acquaintance with the signification and application of that method in real speech encoders. The task of the original project of this thesis is a description and simulation of a simple speech encoder based on LPC, which transforms a real speech signal into a bit flow, which contains all of the significant parameters for its backward reconstruction (LSF coefficients, pitch period, excitation level, voice detection - AMDF method). One part of this thesis is a discussion about currently used speech encoders.
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Device for measuring the ECG signal
Borkovec, Michal ; Harabiš, Vratislav (referee) ; Balogh, Jaroslav (advisor)
This work deals with designing the circuit worthy for the acquisition and display of the ECG signal from the patient. The theoretical part was staged anatomy of the heart, its electrical activity and the ECG signal acquisition opportunities. On the basis of the theoretical part, was designed circuits and software for the acquisition of ECG signal and its subsequent display. It was a series of measurements on the simulator to verify the correctness of a circuit design software.
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