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Amplifier with Speaker Protection
Přibyl, Libor ; Schimmel, Jiří (referee) ; Kubánek, David (advisor)
The present work deals with the issue of speaker damage due to large displacement of the membrane at low frequencies. The main focus is the design and construction of the circuit to protect the speakers from this type of damage and the subsequent measurement of its parameters. The thesis includes theoretical predictions for the optimal design and implementation of the circuit. The work includes complete construction of equipment, including power supply and auxiliary circuits.
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Analysis of frequency and transient properties of non-integer order filters
Cieslar, Šimon ; Kubánek, David (referee) ; Koton, Jaroslav (advisor)
The bachelor thesis deals with analysis of frequency and transient properties of noninteger ( + )-order filters. These filters allow the use of a lower order, compared to the next higher integer-order ( + 1). For example, a system should be created, but a second order would not be sufficient, and in case of the integer-order, a third order system would be considered, but in the case of using a non-integer-order, a fractal-order between them can be used. In the following documentation, attention is paid to the defined group of fractal-order transfer functions, which approximate the identical course of the modulus characteristic according to Butterworth. The form of the function of the linear systems was not taken into account and characteristics such as phase response, group delay, step response and stability were analyzed and evaluated. All for the system ( + )-order, where 3, 4, variable Z1, 4 for (3 + )-order, variable Z1, 5 for (4 + )-order, and (0, 1). Non-integer systems offer a infinite number of orders, making them sometimes more advantageous in a step response or group delay. They can also provide an additional degree of freedom in designing a filter to fine-tune the slope of the amplitude characteristic in the bandwidth. The bachelor thesis deals with non-integer orders and their use in the case of required properties. For easier selection of the correct non-integer order with respect to the required properties, a design recommendation was written within the bachelor’s thesis.
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Microstrip lowpass filter
Kubín, Petr ; Pítra, Kamil (referee) ; Vágner, Petr (advisor)
This thesis is focused on the design of an elliptic microstrip low pass filter. In the introduction, there is discussed theory of the filter design with discrete components. Then, the following part describes the design of the microstrip filter with distributed parameters. To simulate the characteristics of the designed filter structure, the simulator Ansoft Designer V2 was used. This software was also used for final optimization of the microstrip filter.
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Electronically controllable frequency filters with current active elements
Suchánek, Tomáš ; Lattenberg, Ivo (referee) ; Kubánek, David (advisor)
The aim of the thesis is to study the possibilities of the electronic frequency ?lter com- posed of active elements operating in current mode. The main opportunities lie in the change control parameters, most are marginal or quality factor frequency. As the active elements are considered especially CC (Current Convejor), controllable current ampli?er DACA (Digitally Adjustable Current Ampli?er) or combination with the current tracker MO-CF (Multiple Output Current Follower). Another part will focus on the management of the above parameters using digital potentiometers and choosing the appropriate ?lter structure. The ?nal task was to digital control parameters using a PC and measuring its properties.
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Optical detection of electrograms
Hanák, Pavel ; Kozumplík, Jiří (referee) ; Chmelař, Milan (advisor)
The aim of the study was focused on problem of electrograms recording with using voltage sensitive dyes. Study of electrograms recording was extended with thema of optical detectors suitable for measurement and noise analysis. Elimination of noise and disturption was made in program Matlab; lowpass filtration and wavelet transformation was used. Application for electrograms analysis was developed in latter part of this work.
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Input Circuits for Bi-Amp Loudspeaker System
Hanák, Filip ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
The work focuses on the design input circuits for active speaker system. There is described the theory design input circuits such as attenuator pads, low pass filter, preamplifier, Baxandall tone control and S / PDIF. Based on the theory described are selected optimal designs and their subsequent draft. Complex design of the input circuit for loudspeaker system is designed to achieve a low acoustic distortion sound.
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Laboratory kit for demonstration of active low pass, high pass and band pass filter by Sallen-Key structure
Kadlec, Michal ; Smejkal, Vladimír (referee) ; Slezák, Josef (advisor)
The main aim of this work is to design electric circuit for realizing of low pass, high pass and band pass filter using Sallen – Key structure. It is active filter so this work pays attention to choose the suitable active element. I will analyze individual types of frequency filters, simulate designed structure and will choose suitable computing amplifier for our structure. I will simulate every circuit with ideal operational amplifier, with operational amplifier having real parameters and finally with our chosen operational amplifier. I will confront the difference of individual circuit, influence of real parameters of amplifier for the general process of resultant filter modul characteristics. I closer take a look at the output resistance influence of operational amplifier for the modul characteristics of choosen circuit (low pass filter). This project also includes the summary and analyses of individual possibilities of the electronic control applied to active filter parameters. The part of the project is also detailed analyze and process of realization of the final connection of laboratory instrument.
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ARC filters with modern active elements
Sedláček, Petr ; Murina, Milan (referee) ; Sedláček, Jiří (advisor)
The aim of this project is to compare the characteristics of low pass and high pass filters designed by various methods of synthesis. Firstly, the attributes and characteristics of filters and realisations of higher order filters using normed low pass filter and approximation of gain-magnitude frequency response are described and then used in application. The circuits that substitute coils directly or undirectly using the Bruton transform are discussed next. The practical part of project concerns of design of high pass and low pass itself, using two methods of synthesis. Proper real operational amplifier has to be choose for used frequency. In the final part of work the designed circuits were realized and their characteristics were measured and examined.
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Adaptive antialiasing frequency filter
Sovadina, Václav ; Murina, Milan (referee) ; Sedláček, Jiří (advisor)
The aim of this project is to become acquainted with the Bessel approximation function and to present the possible connections of the adaptive antialiasing filter. Then, cascade and partition filter realizations are designed and their computer analysis are carried out. Furthermore, the thesis deals with the options of electronic realignment of filters. A common connection of digital potentiometer along with the block diagram of the whole mechanism are described. The next part presents a construction of the analogue part of the filter, measuring of its real characteristics and the control circuit for the analogue part.
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Pseudo-differential higher-order frequency filters
Jeleček, Jiří ; Dvořák, Jan (referee) ; Sládok, Ondřej (advisor)
This Master's thesis deals with pseudo-differential frequency higher order filters working in voltage mode. The thesis deals with the description of frequency filters, their types and applications. Follows an analysis of differential and pseudo-differential transmissions. Next part contains a description of used active elements (conveyors) at thesis (CCII, DVCC, DDCC, UCC). In the last part the thesis is devoted to the own design of the pseudo-differential filter. Design functionality is verified by experimental simulation.
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