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Sensor for bars of mallet percussion instruments
Pribol, Sebastián ; Balík, Miroslav (referee) ; Jirásek, Ondřej (advisor)
This thesis addresses the issue of capturing melodic percussion instruments using dynamic sensors that can be attached to a musical instrument. It includes theoretical knowledge, analysis, and selection of appropriate sensing methods, and the actual implementation, which consists of testing, integration with MIDI, manufacturing of the device itself, and final calibration and adjustments for proper functionality. The device uses an ESP32-S3 Dev Kit N8R8 microcontroller, which was programmed in the Arduino IDE for proper operation. The device consists of twelve piezoelectric sensors that capture the dynamics of playing the musical instrument and send MIDI information to a DAW via a Bluetooth module.
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Active filters with resonant circuits for correction of loudspekaker system frequency response
Karelin, Iurii ; Hanák, Pavel (referee) ; Balík, Miroslav (advisor)
The bachelor thesis deals with the synthesis of active frequency filters, that are designed for the correction of frequency response of loudspeaker systems for the educational purposes in laboratory. The aim of the thesis is to explore various solutions with different degrees of parameter tunability and to implement selected solutions in the form of interchangeable modules for the modular system mAPC-x2. Two single-unit modules implementing a set of non-parametric filters with switchable center frequency and utilizing synthetic inductors, and one fully parametric dual module utilizing the KHN biquad topology with the capability of independent parameter regulation, were designed and manufactured. Those filters were tested, fine-tuned, and integrated into the existing laboratory assignment of the BPC-REP subject.
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Preamplifier for guitar pickups
Raimr, Jakub ; Balík, Miroslav (referee) ; Hanák, Pavel (advisor)
This thesis focuses on design and realization of a 4-channel preamplifier for guitar pickups. The preamplifier is determined to measure balanced spectral characteristics of all four pickups at the same time. The thesis composes of a theoretical introduction about pickups, installation of pickups in the acoustic guitar, measuring spectral characteristics of pickups, design of the preamplifier on a both-sided PCB, realization of the PCB and final measurement using the finished preamplifier. The final product will serve as a~laboratory exercise in the course Hudební elektronika.
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Impedance tube for measuring sound absorption coefficient and transmission loss coefficient
Hodinka, Tomáš ; Balík, Miroslav (referee) ; Skvaril, Šimon (advisor)
The goal of this thesis is the design and manufacture of the mechanical and electrical components of the impedance tube. The impedance tube is a tool used in laboratories, that has its parameters dictated by norms. On one side of this enclosed airtight tube is a speaker, and on the other the measured material. By switching some additional parts, the tube is capable of measuring not only the acoustic absorption, but also sound penetration. Impedance tube is made, so that it is robust, easy to manipulate and use, and easy to store. The designed impedance tube can measure the sound penetration of any material, that is up to 50mm in thickness, and the acoustic absorption of materials that are up to 120mm in thickness. Parts of the tube, that are directly welded to the tube itself are made of the same metal that the tube itself is, and the speaker enclosure is made from plywood. Along with the assembly of the impedance tube, a complete and detailed drawing documentation for future recreation is added, along with a suitable amplifier and all peripherals necessary for measurements.
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Microphone Array for Estimation of Direction of Arrival of Sound
Kubišta, Ladislav ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
This bachelor's work describe detection of direction receiving sound by analizing of the sound. Work is based on methods of time delay estimation. Programmed algorithm of estimation direction works on cross–correlation and some selected cross–correlation methods. Results of measuring, as programming sound, so sound recorded in laboratory conditions and real enviroment, are mentioned in conclusion. All calculations were done by platform Matlab
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Power supply and protection circuits for 6-channel audio amplifier
Kryška, Vojtěch ; Balík, Miroslav (referee) ; Hanák, Pavel (advisor)
This bachelor thesis deals with designing protection circuits for 6 channel audio amplifier. Created circuits provide AC voltage filtering, current peak limitation after switching on, delayed speakers connection for eliminating crackling, automatic shut down in case of overheath, LED indication of failure and waking up from standby mode. Created design focuses on keeping all channels grounds unconnected with each other for eliminating ground loops.
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Room acoustic modeling
Bernát, Michal ; Balík, Miroslav (referee) ; Míča, Ivan (advisor)
This Master's Thesis deals with geometric modeling methods and theirs implementation in Octave (Matlab), which is ideal for the practical realization. The first part of the thesis is focused on a very simplified image source method, which is able to calculate and render the 2D impulse response of rectangular rooms. The next part is aimed on~the same method, but extended by three-dimensional simulation of polyhedral prism-shaped rooms. There is both an explanation of theoretical and mathematical aspects and a~documentation of the implemented source code. Extended image source method is able to generate sound representation of impulse response characteristics, and use it for auralization, which is achieved by using convolution of both the input sound source and the calculated impulse response. At the end there are two practical examples for both methods with explanatory illustrations.
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Programming of processors in 32- or 64-bit operation systems
Rášo, Ondřej ; Kyselý, František (referee) ; Balík, Miroslav (advisor)
Main topic of this thesis is Win32 application programming interface and symbolic instructions programming language. It can be divided into four parts. First part sums the basics of 32-bit programming in symbolic instructions language in Windows. Second part describes the Win32 resources for computer intercommunication. Third part presents, describes and comments selected problems in symbolic instructions language.Last part covers a creation of an example application. This application and its parts will be the content of computer exercises in VUT Brno FEEC subject Počítače a jejich periferie.
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Features and testing of mobile devices with Android OS
Ružička, Silvestr ; Malina, Lukáš (referee) ; Balík, Miroslav (advisor)
The work deals with creating applications for the Android OS, gathering information on mobile device and testing of computing power. In this theisis we talk about the history, development and architecture of the Android OS. Described here the application development fo Android OS. Process The output of this work is an application for finding information on the mobile device and to test the computational performance.
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