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Antenna system for wireless microphones
Bartoš, Adam ; Lukeš, Zbyněk (referee) ; Láčík, Jaroslav (advisor)
Master's thesis deals with the design of an antenna system for wireless sound transmission used mainly in professional sound reinforcement. The introductory part deals generally with wireless microphones, frequency bands used and proven antenna types. Next, this work deals with signal distribution that is realized using the antenna splitter. The antenna parts is focused on easy production and real usage, therefore were selected antennas with appropriate properties suitable for small series production. This thesis includes simulation of each device, their real construction design and measurements of built prototypes and final products. All three produced devices – the rack splitter, /4 antenna and Helix antenna are fully working, achieve good parameters and are ready for further manufacturing and easy modifications in case of frequency band change requirement. The conclusion includes an overall assessment of the results achieved.
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Active studio speakers
Bartoš, Adam ; Kratochvíl, Tomáš (referee) ; Brančík, Lubomír (advisor)
This bachelor's thesis deals with problematics of low frequency amplifiers in D class and their usage in active bi-amp speaker systems. It also deals with construction of so called band crossovers, made using digital signal processors (DSP) that are used as high and low pass filters, and with construction of speaker boxes itself. This work contains simulations of power supply, preamplifier with crossover and volume regulation and power amplifier in app PSpice and simulation of speakers in app Amplion. The draft of an overall diagram can be seen in block scheme and further in schematics of separate modules.
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Reform of the electoral law for the elections to the Chamber of Deputies of the Parliament of the Czech Republic in 2021
Bartoš, Adam ; Stauber, Jakub (advisor) ; Brunclík, Miloš (referee)
The diploma thesis deals with the analysis of the development of the electoral system for the Chamber of Deputies of the Parliament of the Czech Republic, and especially with the reform of the electoral law that took place in 2021. The aim is to find out whether and to what extent the reform of the electoral law has changed the existing situation in terms of proportionality. Another objective is to apply the individual proposals of the Electoral Law to the results of the elections to the Parliament of the Czech Republic and thus analyse the individual proposals and their potential consequences on the results of the elections from the perspective of proportionality. The result of the work will be an assessment of the individual proposals of the electoral law reform for the Czech Republic.
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Topologies generated by adding single points
Bartoš, Adam ; Simon, Petr (advisor)
We define a general notion of closure scheme to systematically study the classes of Fréchet, sequetial, (pseudo)radial, (weakly) (discretely) Whyburn, and (weakly) discretely generated spaces. First, several general propositions on closure schemes and preservation of induced properties under topological constructions are proved and later applied when we systematically summarize the properties of the classes mentioned above. Next, we focus on a detailed overview of inclusions between the classes in the general case, in the case of Hausdorff spaces, and under additional conditions like compactness and countable compactness. Valid inclusions between the classes are summarized in well arranged diagrams, invalid inclusions are demonstrated by several counterexamples.
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Families of connected spaces
Bartoš, Adam ; Vejnar, Benjamin (advisor) ; Charatonik, Włodzimierz (referee) ; Hušek, Miroslav (referee)
Families of connected spaces Adam Bartoš Abstract We deal with two completely different kinds of connected spaces - maximal connected spaces and metrizable continua. A topologi- cal space is maximal connected if it is connected, but every strictly finer topology on the same base set is disconnected. Here, the name "Families of connected spaces" refers to the collection of all connected topologies on a given set, which is ordered by inclusion, and maximal connected topologies are its maximal elements. We study the con- struction of tree sums of topological spaces, and how this construc- tion preserves maximal connectedness. We also characterize finitely generated maximal connected spaces as T1 2 -compatible tree sums of copies of the Sierpiński space. On the other hand, we are interested in a general question when for a given class of continua there exists a metrizable compactum whose set of components is equivalent to the given class. (Two classes are equivalent if they contain the same spaces up to homeomorphic copies.) We introduce compactifiable, Polishable, strongly compactifiable, and strongly Polishable classes of compacta, and we investigate their properties. This is related to the descriptive complexity of equivalent realizations of the given class in the hyper- space of all compacta. We prove that...
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Antenna system for wireless microphones
Bartoš, Adam ; Lukeš, Zbyněk (referee) ; Láčík, Jaroslav (advisor)
Master's thesis deals with the design of an antenna system for wireless sound transmission used mainly in professional sound reinforcement. The introductory part deals generally with wireless microphones, frequency bands used and proven antenna types. Next, this work deals with signal distribution that is realized using the antenna splitter. The antenna parts is focused on easy production and real usage, therefore were selected antennas with appropriate properties suitable for small series production. This thesis includes simulation of each device, their real construction design and measurements of built prototypes and final products. All three produced devices – the rack splitter, /4 antenna and Helix antenna are fully working, achieve good parameters and are ready for further manufacturing and easy modifications in case of frequency band change requirement. The conclusion includes an overall assessment of the results achieved.
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Topologies generated by adding single points
Bartoš, Adam ; Simon, Petr (advisor)
We define a general notion of closure scheme to systematically study the classes of Fréchet, sequetial, (pseudo)radial, (weakly) (discretely) Whyburn, and (weakly) discretely generated spaces. First, several general propositions on closure schemes and preservation of induced properties under topological constructions are proved and later applied when we systematically summarize the properties of the classes mentioned above. Next, we focus on a detailed overview of inclusions between the classes in the general case, in the case of Hausdorff spaces, and under additional conditions like compactness and countable compactness. Valid inclusions between the classes are summarized in well arranged diagrams, invalid inclusions are demonstrated by several counterexamples.
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Topologies generated by adding single points
Bartoš, Adam ; Simon, Petr (advisor) ; Hušek, Miroslav (referee)
We define a general notion of closure scheme to systematically study the classes of Fréchet, sequetial, (pseudo)radial, (weakly) (discretely) Whyburn, and (weakly) discretely generated spaces. First, several general propositions on closure schemes and preservation of induced properties under topological constructions are proved and later applied when we systematically summarize the properties of the classes mentioned above. Next, we focus on a detailed overview of inclusions between the classes in the general case, in the case of Hausdorff spaces, and under additional conditions like compactness and countable compactness. Valid inclusions between the classes are summarized in well arranged diagrams, invalid inclusions are demonstrated by several counterexamples.
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Dense sets in products of topological spaces
Bartoš, Adam ; Simon, Petr (advisor) ; Hušek, Miroslav (referee)
A subset of a product space is thin if every two its distinct points are distinct in at least two coordinates. A subset of a product space is very thin if every two its distinct points are distinct in all coordinates. The thesis sum- marizes the basic properties of thin-type dense sets in products of topological spaces. Sufficient and necessary conditions of their existence are given and several examples are shown. The main result of the thesis is a construction showing that under the continuum hypothesis, for every natural n ≥ 1, there exists a countable T3 dense-in-itself space X such that Xn contains an n-thin dense subset, but Xm , n < m < 2n, doesn't. Besides, Xm , n < m < ω, does not contain any (n + 1)-thin dense subset. A weaker form of the theorem is proven under Martin's axiom.
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Active studio speakers
Bartoš, Adam ; Kratochvíl, Tomáš (referee) ; Brančík, Lubomír (advisor)
This bachelor's thesis deals with problematics of low frequency amplifiers in D class and their usage in active bi-amp speaker systems. It also deals with construction of so called band crossovers, made using digital signal processors (DSP) that are used as high and low pass filters, and with construction of speaker boxes itself. This work contains simulations of power supply, preamplifier with crossover and volume regulation and power amplifier in app PSpice and simulation of speakers in app Amplion. The draft of an overall diagram can be seen in block scheme and further in schematics of separate modules.
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