National Repository of Grey Literature 79 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Meter of Total Harmonic Distortion and Dynamic Range
Mezin, Mikhail ; Koton, Jaroslav (referee) ; Kubánek, David (advisor)
The purpose of the document is to show a design of measuring instrument and method for total haronic distortion and dynamic range measurement, with a focus on construction simplicity. A brief overview of currently used methods and circuits was done, and on it’s basis, own device variant was designed.
Audio signal processing in electronic circuit simulators
Paluřík, Pavel ; Herencsár, Norbert (referee) ; Kubánek, David (advisor)
This bachelor's thesis deals with the simulation of electronic circuits with a focus on the processing of audio signals. At the beginning of the work a detailed procedure and instructions for work in the selected simulation program LTspice are described. The program is free to download, so anyone can try the simulations. The import, processing and export of audio files are also described. The sound of an electric guitar, a spoken word in a male voice, rock and synth recording are then discussed in more details. The last part is devoted to detailed examples of the functions of the tested circuits. The circuits tested are high-pass filter, diode limiter and effect pedal Fuzz Face which is compared with real constructed unit. The verification of the sound from the computer simulation is subjectively evaluated at the end of the work considering similarity of simulated and real recorded audio from Fuzz Face.
Laboratory exercise demonstrating properties of balanced connections
Sabatula, Vojtech ; Koton, Jaroslav (referee) ; Kubánek, David (advisor)
The aim of the bachelor thesis is to study the principle and properties of balanced interconnections of outputs and inputs, sound devices and to summarize theoretical knowledge in this area. It focuses mainly on the factor of common-mode rejection and the influence of output and input resistances amplification and pole frequency of the used amplifier. Computer simulations and measurements on prepared electronic circuits prove the mentioned knowledge.
Tremolo effect with high modulation frequency range
Pazdera, Michal ; Dvořák, Jan (referee) ; Kubánek, David (advisor)
This work was created while designing the dynamic modulation effect „tremolo“. Because there are certain conditions (wide modulation frequency range, precise input of parameters and precise indication), this work is going to be constructed mainly of searching the right components and schematics, especially wide range frequency oscillator with a period from cca ten seconds to the frequency of hundreds of hertz, and of the digital frequency counter which serves as a precise indicator, but we will also talk attenuators, amplifiers, driving circtuits or a power circuit. Also equations schematics/circuits and their improvements can be found here. In the end there‘s also a short description of the two famous tremolo effects from BOSS and Schaller manufacturers.
Methods of acoustic signal sources impedance matching for their further processing
Havelková, Nikola ; Kubánek, David (referee) ; Koton, Jaroslav (advisor)
The purpose of this bachelor thesis is to get acquainted with the theoretical areas related to the issue of impedance matching using the so-called DI boxes. It is mainly the theory of balanced and unbalanced signal, parameters typical for DI boxes (THD, impedance, bandwidth, dynamic range, etc.), knowledge about the transformer, respectively about the coils, or last but not least the issue of operational amplifiers, which is for designing of active DI box absolutely essential. The specifications of the designed DI box based on this theory are subsequently determined and compared with commercially available models. The main target is to achieve better figures or at least get closer to them. Furthermore, the circuit diagram is designed and optimized to achieve predetermined parameters using simulation in the Multisim program from National Instruments. Regarding the resulting specifications of the DI box, a printed circuit board is designed to build a prototype of the device. After its completion, a test gauging using APx525 is done and the results are compared to the target figures.
Methods of acoustic signal sources impedance matching for their further processing
Havelková, Nikola ; Kubánek, David (referee) ; Koton, Jaroslav (advisor)
The purpose of this bachelor thesis is to get acquainted with the theoretical areas related to the issue of impedance matching using the so-called DI boxes. It is mainly the theory of balanced and unbalanced signal, parameters typical for DI boxes (THD, impedance, bandwidth, dynamic range, etc.), knowledge about the transformer, respectively about the coils, or last but not least the issue of operational amplifiers, which is for designing of active DI box absolutely essential. The specifications of the designed DI box based on this theory are subsequently determined and compared with commercially available models. The main target is to achieve better figures or at least get closer to them. Furthermore, the circuit diagram is designed and optimized to achieve predetermined parameters using simulation in the Multisim program from National Instruments. Regarding the resulting specifications of the DI box, a printed circuit board is designed to build a prototype of the device. After its completion, a test gauging using APx525 is done and the results are compared to the target figures.
Analogue guitar effects
Trojak, Ondřej ; Kubánek, David (referee) ; Koton, Jaroslav (advisor)
This work is focused on analog guitar effects. It deals with sorting them in the terms of sound parameters which they have impact on. Later, the work focuses on theoretical description of function of tremolo and possible ways to implement its fundamental parts. In the second half a design of a very own analog solution of this effect has been fully described including modification which has been done and particular simulations executed in Micro-Cap software. In a final part, a practical realization, measurements, a revision of existing circuits and possible further development are analysed.
Influence of Impedance of Input and Output Circuits and Connecting Cables on Audio Signal Transmission
Ďurka, Adam ; Hanák, Pavel (referee) ; Kubánek, David (advisor)
This bachelor thesis deals with the influence of parasitic properties of audio cables as well as input and output impedances of various audio devices for signal transmission between them and also its linear distortion. Using alternative wiring diagrams of these devices, simulations of transmission and linear distortion are performed, and then laboratory jigs for measuring these parameters are designed and implemented. In the next part of the work, the measurements of the transfer between the jigs are performed using the Bode 100 circuit analyzer and the resulting characteristics are compared with the simulated values.
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.
Vector image export program for Autodesk Eagle
Sičkaruk, Roman ; Kubánek, David (referee) ; Hanák, Pavel (advisor)
This master’s thesis deals with design and creation of ULP program for export of vector images in EMF (Enhanced Windows Metafile) format. The main aim of this thesis is to add support of all features of Autodesk Eagle version 9. Thesis is important due to bugs and imperfections of other ULP programs for exporting of vector images to other formats also because of they aim for older versions of Autodesk Eagle. With regard to small quantity of EMF literature, thesis is beneficial as it describes behaviour of base structures and describes creation of EMF metafile. It also provides example of iteration over individual parts of schemes and printed circuit boards. Main goal of this thesis was completed. User is allowed to export currently visible layers, set order of their printing, with remain of true colors and orientation. Program was tested in Autodesk Eagle systems version 9.1.3 and 9.3.2.

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