National Repository of Grey Literature 90 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Big Muff Type Distortion Guitar Effects
Beránková, Tereza ; Balík, Miroslav (referee) ; Kubánek, David (advisor)
Presented thesis is focused on construction and functionality of distortion effects and equalizers. It investigates the possibility of their usage in guitar distortion effect called Big Muff which consist of several blocks. One of them is tone control and this thesis intention is to implement equalizer instead. Part of this thesis is also creation of a laboratory task focused on measuring and understanding to this guitar effect
Tube guitar amplifier
Mostecký, Jan ; Balík, Miroslav (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor thesis studies guitar tube amplifiers. The thesis introduces basic concepts behind electrical valve circuits. After that there is a scheme of a modified vacuum tube amplifier designed by the author. The functionality of the design has been verified via computer simulation. Designed amplifier was built afterwards and its functionality was verified via measurements.
D'Appolito loudspeaker enclosure and its measurement
Dočekal, Ondřej ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
This bachelor’s thesis deals with a modular two-way speaker system with two mid-bass speakers in a D’Appolito arrangement. Both the effect of the D’Appolito arrangement on the directional characteristics and the effect of the relative position of the loudspeakers on these characteristics are investigated here. Part of this work is also a theory that explains basic knowledge about speaker systems and their parts, and which also clarifies the meaning of this work.
Transmission line loudspeaker enclosure property measurement
Pavlik, Miroslav ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
The aim of the master thesis is to describe the characteristics of transmission line loudspeakers. Getting to know the modular transmission line enclosure, which allows changing the position of the speaker and also the combination of two mid-bass speakers. Another goal is the study of types of measurements of frequency characteristics and the subsequent processing of the procedure of composing frequency characteristics in the free field. One of the main points of the diploma thesis is the demonstration of individual properties of the enclosure using frequency characteristics. The last point is the creation of a laboratory assignment.
Class-D Audio Amplifiers and Their Optimization
Ďurka, Adam ; Balík, Miroslav (referee) ; Kubánek, David (advisor)
This thesis deals with an overview of the types of audio signal amplifiers, while its main goal is the description of class D. In addition to the basic principle of function, it reviews the most important parameters of this class, as well as its shortcomings and disadvantages. Subsequently, a design of a laboratory device, a class D amplifier consisting of discrete components is created, on which it is possible to set several parameters and monitor important signals. The thesis also includes simulations of this design in the Micro-Cap program to verify its functionality. Based on them, a functional laboratory device usable in exercises is constructed and and its parameters are also measured.
Audio Data Interpretation in Image and Video
Dobiášovský, Jiří ; Balík, Miroslav (referee) ; Říha, Kamil (advisor)
The content of the thesis is the elaboration of the problem of image and video interpretation of sound data. In the theoretical part, the topic of the sound signal, its properties and the representation of the sound signal in the time and frequency domain are treated first. Furthermore, its digital processing is described and individual communication protocols with which it is possible to transmit audio data or communicate with audio and video devices are described too. Based on the findings from the theoretical part, a suitable system is chosen for 3D generative visualization of the sound signal based on MIDI data or its envelope. A system is created for processing sound data in the DAW and sending it over the local network using a suitable protocol. In the environment chosen for visualization is created a program that receives the sent signals and sorts them appropriately. The process of creating visual effects is described, the method of their use in the visualization of the audio signal and mutual communication between the two programs is demonstrated using suitable examples and pilot project. The system resulting from this work can be used for real-time 3D generative visualization of music data.
Measuring Loudspeaker System for Laboratory Practices
Tomešek, Jiří ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
This bachelor's thesis deals with the design of a two-way speaker system and a variable baffle for a subwoofer for the purposes of demonstration measurement in the subject of Electroacoustics. The theoretical part explains the individual speakers, TS parameters and formulas for their calculation. Furthermore, various types and constructions of baffles and audio crossovers. Using the simulation program LspCAD, the designs of closed and bass reflex baffles with right and wrong parameters were fine-tuned and simulated. The proposed crossover for a two-way speaker system was also simulated. Drawing documentation was prepared for the designs. Furthermore, the baffles and crossovers were implemented, and their characteristics were measured. Finally, the existing laboratory tasks were reworked so that students could use the implemented baffles and the chosen design procedure.
Near-field measurement of a modular subwoofer unit
Borodáč, Samuel ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
The bachleor thesis describes influence of the type of loudspeaker baffle and methods of measuring the subwoofer unit on the frequency response at low frequencies. The work describes the configuration of measurements and the procedure in the analysis software APx500, as well as the export and evaluation of measured values. Moreover, the thesis also includes the results of measurements, its brief analysis and observation of phenomena affecting the measurement of the modular frequency response of the loudspeaker unit in the near field, as well as achieving the overall resulting frequency response of the loudspeaker unit.
Compensation of loudspeaker measurements using standard baffle
Štěpáník, Jiří ; Schimmel, Jiří (referee) ; Balík, Miroslav (advisor)
The frequency response of the loudspeaker is one of the key data that needs to be known, for example, when designing a speaker cabinet or speaker system. The frequency response should be achieved with the highest possible accuracy and with a minimum of distortion. How to achieve such characteristics is described in the standard ČSN EN 60268-5, which states as one of the ways the use of standard enclosures. Except for the standard baffle, these baffles have correction curves for the measured characteristics described in the standard. However, this does not mean that the standard baffle does not distort the measurement. The aim of this work is to analyze the distortion of measurements caused by this baffle and other elements and their compensation. The work contains a description of certain parts of the standard ČSN EN 60268-5 with focus on the standard baffle. Especially on its construction and methods of measuring the speakers mounted on it. Several test measurements were performed within the work. These measurements were performed in a anechoic chamber with speakers mounted on a modular standard baffle, which is a modification of the standard baffle which is also described in the work. The measurements performed include the measurement of frequency characteristics at different distances of the microphone from the speaker at different positions of the baffle in the anechoic chamber. The test measurements show that the modular standard baffle and anechoic chamber cause measurement distortion. In other measurements, the distortion by the anechoic chamber is minimized and the distortion caused by the base of the modular standard baffle is completely eliminated. The thesis then presents the theory of sound diffraction at the edges of a standard baffle and the theory of the extended Biot-Tolstoy-Medwin method of modeling these diffractions using numerical calculations. Based on this theory, software compensation of diffraction distortion was performed in Matlab. It is not entirely clear from the results of the compensation to what extent it can be considered successful. It can be speculated that it only works on certain frequencies. It is necessary to verify the functionality of this compensation method by another test measurement.
Meteorological station system
Čada, Jan ; Balík, Miroslav (referee) ; Lattenberg, Ivo (advisor)
This bachelor thesis deals with the design and implementation of a online meteorological station system, which consists of individual weather stations that communicate via the Internet with the server. The first part of the thesis discusses the principles of measuring major meteorological variables and deals with the selection of suitable sensors for measuring temperature, atmospheric pressure, humidity, wind speed and rainfall. In the practical part, one of the weather stations based on Raspberry Pi Zero microcomputer is designed and realized. As a complement to the measured data, the station includes a camera that captures the view from the site where the meteostation is installed. 3D printing is used to realize most of the mechanical parts, it has the advantage of speed, accuracy and easy reproducibility. For the measurement of temperature, pressure and humidity, a combined sensor BME280 from Bosch is used, which is placed in a small Stevenson screen. The wind speed is measured by a cup anemometer whose rotation is sensed by an integrated Hall sensor. The output pulses are then counted using the PCF8583 circuit, which has an I2C interface for reading the values with a Raspberry Pi microcomputer. Special attention is paid to the construction of a custom calibratable tipping bucket rain gauge with a resolution of 0,5 mm, whose mechanical motion is also sensed by a Hall sensor as in the anemometer. The reading of the data from sensors and sending it to the server is handled by a Python script. For storing and presenting data to users, a custom server solution based on LAMP webserver is implemented, its source codes are written in PHP, HTML, JavaScript and CSS. In addition to the web interface, which displays the data in graphs, the measured data can be also presented to the user via an application for mobile devices based on Android. The application was developed in C# using the Xamarin framework in the Microsoft Visual Studio development environment. Among other things, it implements a widget for quick access to the measured values directly from the home screen. In the final part of the thesis, interesting findings obtained by observing the measured values are mentioned.

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