|
|
Electronic Filtering Circuits with Arbitrary Frequency Characteristics
Klubus, Jan ; Vrba, Kamil (referee) ; Kubánek, David (advisor)
Master’s thesis deals with the issue of electronic filtering circuits with arbitrary frequency characteristics. First part of the thesis describes theoretical basis. Second part explores the possibilities of design procedures for filters with arbitrary frequency characteristics. Design procedures are demonstrated on examples accordingly to the presented methods, including their circuit implementation and computer simulation to verify the correctness of theoretical assumptions. Thesis also explores the possibilities of tuning circuit structures and electronic setting for characteristics using controllable active elements.
|
|
|
Practical examples of signal processing
Hanzálek, Pavel ; Smékal, Zdeněk (referee) ; Mekyska, Jiří (advisor)
The thesis focuses on the issue of signal processing. Using practical examples, it tries to show the use of individual signal processing operations from a practical point of view. For each of the selected signal processing operations, an application is created in MATLAB, including a graphical interface for easier operation. The division of the thesis is such that each chapter is first analyzed from a theoretical point of view, then it is shown using a practical demonstration of what the operation is used in practice. Individual applications are described here, mainly in terms of how they are handled and their possible results. The results of the practical part are presented in the attachment of the thesis.
|
|
|
Design and realization of the vocal encoder for audio electronics
Milota, Vojtěch ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
This work deals with the design of the vocal encoder, a device used for regressive synthesis of a speech signal using an external carrier signal. Work consists of the block chart, its breakdown and following design of all partial circuit solutions, including simulations in the software environment, followed by design of the printed circuit board and realisation of a prototype of the vocal encoder, followed by experimental measurement of its properties.
|
|
|
Correlation analysis of optically trapped particle motion
Koudelníček, Karel ; Jákl,, Petr (referee) ; Harabiš, Vratislav (advisor)
This bachelor’s thesis deals with the description of random (Brownian) motion of microscopic particle trapped by optical trap. This thesis provides overview of possible usage in biology. The major part of the thesis is dedicated to description of methods that allow characterize optical trap with etc. stiffness thanks to the random motion. First, the estimation methods are tested on the simulated data. Before using these methods for real data, it was necessary to modify them, specifically to eliminate crosstalk and frequency noise. The differences in the estimation of the stiffness from the autocorrelation function and the power spectrum were described in the conclusion.
|
|
|
Equalizer with loudness regulation for laboratory measurements
Karkoška, Jan ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor’s thesis deals with a draft and construction of the design of equalizer with loudness regulation for laboratory measurements lessons and also simulation of individual parts in the program LTspice. For design was used bandpass correction with series resonance circuits. All bands are tuned to a frequency f0 with a degree of ± 12 dB. Thesis includes block diagram, design of equalizer in detail, scheme of equalizer with physiological regulation and the design of printed circuit boards.
|
|
|
The Design Methods of Equipments for Audio
Kondler, Radim ; Vrba, Kamil (referee) ; Mišurec, Jiří (advisor)
The work is focused on equipment used in audio, such as a loudspeaker crossovers, amplifiers and preamplifiers. There are theoretically described loudspeaker crossovers, their parameters, types of structures derived from the frequency filters with their parameters. Further deals about audio amplifiers and both voltage and power, their theories, parameters, and distribution.
|
|
| |
|
|
Narrow-band PLC modem
Skala, Milan ; Krajsa, Ondřej (referee) ; Mišurec, Jiří (advisor)
This bachelor's thesis deals with narrow band PLC modem for 230/400 V power line. In the first chapter we can find basic theory about using modulation, interference, impedance of line, communication, capacitive and inductive coupler. Next chapter deals with design and simulation of capacitive coupler, transceiver circuit, receiver circuit, power supply and circuit for modem synchronization with power line frequency. In this chapter we can find information about building a converter from UART to USB. Third chapter of this thesis is dedicated to designing the printed circuit board and building the modem. Last chapter deals with setting the modem switches, description of its inputs and outputs and basic manual for the modem's software.
|
|
|
Study of Electronic Control and Real Behavior in Variable Filtering and Oscillating Applications of Modern Active Elements
Šotner, Roman ; Ondráček, Oldřich (referee) ; Martínek,, Pravoslav (referee) ; Petržela, Jiří (advisor)
The thesis deals with electronically adjustable and configurable applications of the modern active elements. In the field there were presented various active elements in applications of the analog filters and oscillators which stem from basic and more or less similar principles of circuit synthesis and design. However, there is not provided study of real behavior in detail and in most cases electronic control of the various parameters in application is not verified. In the precise design of application is very important to identify problematic features and determine how much it influences functionality of the device. In this work several filtering structures based on common and modified synthesis principles (integrator loops) are compared in the view of multifunctionality, configurability, variability, kind of used electronic control and impact of influences of real elements on behavior. There are used standard methods like adjusting of variable transconductance, intrinsic value of current input resistance and not so common method based on variable current gain in design of modified and improved multifunctional filtering circuits. The last method of mentioned control enabled to find quite unique filter which allows continuous electronic change of transfer from band-reject to all-pass filter of the 2nd order without reconnection. It is much simpler than previous and more common integrator loops. Larger part of this work is focused on electronically controllable oscillators mainly on quadrature types. There is presented several very simply and elementary realizations which require minimal number of active and passive elements. There are also slightly or more complicated solutions which remove some drawbacks of mentioned simpler variants. First of all there is given attention on study of real behavior which make obvious different problems with mutual dependence of oscillation condition and oscillation frequency, dependence of produced amplitudes (quadrature types) on parameter which is controlling oscillation frequency, influence of this parameter on oscillation condition, etc. In the framework of this part of the thesis there was introduced a novel modification of current conveyor transconductance amplifier (CCTA) so called current-gain-controlled current conveyor transconductance amplifier (CGCCCTA). Requirements for novel applications in the field of oscillators for newly developed controllable current amplifier and digitally controllable current amplifier (DACA) at the Department of Telecommunication FEEC BUT lead to creation of several chapters of this work where mentioned active elements can be used. The important contribution of this work (for practical approach) is also experimental testing of most of designed circuits and determination of exact design equations and rules which take into account real behavior of circuits and confirm results obtained from experiments.
|
|
|
Tunable ARC frequency filter
Kufa, Martin ; Murina, Milan (referee) ; Sedláček, Jiří (advisor)
This bachelor thesis deals with ARC frequency tunable filters. The introductory chapter generally focuses on the basic terms of the frequency filters, such as the mathematical expression of the transfer function, types of selective filters, tolerant field, etc. The next section describes the actual higher-order ARC filters and cascade sequencing, especially ARC band reject and possibilities of its implementation. Following is a concrete realization of the ARC filter to band reject with suggestions for tuning the frequency components in the frequency range 10 kHz to 100 kHz and retuning quality factor. Finally, this work contains the printed circuit board (PCB) design of the ARC frequency analog and digital filter section for tuning F0 frequency and quality factor Q setting using digital potentiometers. Furthermore, it also outlines the flowchart of the program for digital control.
|
guest ::
