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EEG signal measurement using acquisition PC card
Polák, Radek ; Kolářová, Jana (referee) ; Kolář, Radim (advisor)
The build preamplifier and the EEG Signal Measure Virtual Machine is the aim of this project. The abstract of actual clinical electroencefalography, the ways of measurement and processing of brain signals by clinical machines, and introducing my way of measure signal are placed in this work. The preamplifier has been designed for amplification of the brain signal, LabView virtual machine for maesurement and processing amplified signal.This project includes the measure output, the description of virtual machine, and the advice using of this product.
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Tube microphone preamplifier
Čacký, Adam ; Hruboš, Zdeněk (referee) ; Brančík, Lubomír (advisor)
The theme of the master´s thesis is design a microphone preamplifier which uses vacuum tube as a main amplifying element. Part of the work is theoretical assumptions for the optimal design and implementation of peripheral involvement, comparing the properties of components used and the resulting parameters of modeled device. The thesis also includes a proposal of the source unit for supplying all parts of the preamplifier. The results are accompanied by circuit simulations and laboratory measurements of the main parameters of the designed device.
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Audio Mixer Used for Laboratory Measurements
Kalina, L.
This project describes the microphone preamplifier which is part of the second channel audio mixing console. In this circuit are used low noise and low THD amplifiers. As an integral part of this project is a design of chassis and render of the mixer from CAD program Solid Works.
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Sound source localization
Vélim, Jan ; Brejl, Milan (referee) ; Fedra, Zbyněk (advisor)
The paper discusses a possibility of localization of a sound source inside a wooden beam. The method is based on measuring signals from two microphones, assuming the sound source lies between the microphones. The position of the sound source is calculated from the delay between the signals. The calculation of the delay is done by correlation of the signals in the frequency range. ARM architecture microcontroller is used to for the calculations.
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Design of bass guitar preamplifier
Müller, Radek ; Tošovský, Petr (referee) ; Brančík, Lubomír (advisor)
This thesis deals with analog bass guitar preamplifiers and related functional blocks such as equalizers and bass effects. The first part contains a theoretical analysis of individual functional blocks preamplifiers and principles as well as an outline of the design and construction principles. In the following section is presented a design of connection that involves a bass guitar preamplifier, including an equalizer, an integrated distortion effect and an amplifier for headphone output. The proposed connections are simulated in the PSpice program and the printed circuit boards design is carried out using the Eagle program. Based on previous results, the construction of a bass guitar preamplifier is realized. The parameters of the individual blocks are measured and compared with the simulations.
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Design and Implementation of Active Loudspeaker System with Digital Input
Uchytil, Filip ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
The work is focused on a design of an active loudspeaker system with a bi-amp amplifier and a digital input. There is described the theory of a loudspeaker enclosure design and its practical implementation. Furthermore the work deals with a design and construction of input circuits such as a preamplifier, Baxandall tone control, active crossover, all-pass filter and S/PDIF. On the basis of the amplifier´s theory the optimal construction of amplifiers and their design are selected. The complex design of the loudspeaker box is devised so that it would reach a maximum acoustic power during the preservation of a low distortion.
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Program for design of CATV
Sedláček, Jan ; Hála, Ondřej (referee) ; Říčný, Václav (advisor)
The main task of this master’s thesis is to create an interactive computer programme for the design of small and medium television cable circuits. The first part of this document describes main conceptions of a modification and a distribution of television signals. There are also introduced basic topologies of small and medium sized distribution networks, some passive and active elements in the circuit including their usage. There is also described an algorithm for calculation of circuit’s values. The second part contains a detailed description of created programme with all of its functions. A part of this document is made by a sample calculation of the four variants of circuit and its comparison with computer calculation. In suplement are included selected parts of source code.
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Computer design of the small CATV
Sedláček, Jan ; Slanina, Martin (referee) ; Říčný, Václav (advisor)
Main task of this bachelor’s thesis is to create an interactive automatic programme for designing circuits of individual or small common television aerial. The first part of this document describes main conceptions distribution of television signals, parameters of coaxial cable and also some kinds of signals distortion. There are described some important mathematics formulas used for calculation of coaxial cable attenuation and carrier to noise distance important for computing function of programme. The second part describes a procedure of designing of television cable circuit of individual or small common television aerial and includes prototypal calculation of two real circuits and its comparison with results of computer calculation by which correct function of programme is verified. A part of this document is also made by detailed description of programme and its functions. Source code of created programme is included in the end of this document.
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Broadband Lownoise Amplifier
Varga, Kamil ; Havránek, Zdeněk (referee) ; Beneš, Petr (advisor)
The bachelor thesis describes the problems of broadband low-noise preamplifiers and the conditions of their design, including their printed circuit board. Furthermore, the thesis considers debugging and measuring of the most important parameters of these amplifiers. All of these problems are explained on two practical solutions.
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Dualband Antenna for Global Navigation Satellite System
Mikulášek, Tomáš ; Lukeš, Zbyněk (referee) ; Láčík, Jaroslav (advisor)
This master’s thesis introduces to the reader with a modern antenna type the microstrip patch antennas. The most common types of microstrip antennas and their parameters and feeding methods are introduced in the theoretical section of this master’s thesis. This section deals with the circularly polarized microstrip antennas. Design of an active dual-band circularly polarized antenna for global navigation satellite application in the AWR Microwave Office is presented in the practical section. The proposed single-fed dual-band circularly polarized design is achieved using two stacked square microstrip patches. The antenna operates at the L1 + E1 and L5 + E5a frequency bands. Antenna preamplifier consists of a low-noise transistor and a dual-band band-pass filter. The thesis describes realization and measurement results of the dual-band antenna performance in the anechoic chamber. Measured results of the preamplifier performance are presented.
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