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Application for Testing Critical Listening Skills
Ecler, David ; Říha, Kamil (referee) ; Schimmel, Jiří (advisor)
My work is aimed at providing a comprehensive overview of hearing testing applications, and thus acquiring the sound engineer’s skill of critical listening. The thesis presents the different types of critical aspects of audio signals, then a summary of the possibilities of testing these critical signals, a description of the different tests and exercises, including the conditions of their performance. The tests are divided into chapters according to their focus. In the practical section, I have programmed some of the tests that can be used to acquire and practice critical listening skills. The tests are programmed in the Matlab App environment.
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ArtNET and DMX converter
Strouhal, David ; Schimmel, Jiří (referee) ; Krajsa, Ondřej (advisor)
Goals of this thesis is design and realization of Art-net to DMX512 converter. First, a description of the currently used protocols for controlling stage lighting was made. This was followed by a successful proof of concept of the solution and subsequent implementation of the converter including PCB design and programming of the ESP32 processor to convert the protocols.
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Hardware Platform for Effects Processor
Opluštil, Štěpán ; Liska, Matej (referee) ; Schimmel, Jiří (advisor)
This thesis devoted to field of digital signal processing and digital signal processor in form of a Daisy Seed Module, containing MCU and codec, designated to audio application. There is discussed transform of a system from analogue to digital region, most common filters used for audio processing in equalizers and computation of transfer function coefficients from entered parameters of a filter, such as center frequency, gain and q-factor. Dynamic and delay effects are discussed here as well. The thesis is further more devoted to design of a hardware platform for such a module, which contains IO periphery for easy use and learning on this module in the field of audio effects and real-time audio processing. Effects and libraries are in C++, where are mostly used advantages of object oriented programming. User interface is consists of simple menu allowing adding filters to cascade. For demonstration is created 5 audio effects with an option to easily add more effecrs. There are buttons and encoders for control and alphanumeric LCD display for displaying graphical user interface. Libraries provided with Daisy Seed module are used for peripherals interface.
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Design of a spherical microphone array
Voch, Filip ; Schimmel, Jiří (referee) ; Liska, Matej (advisor)
Spherical microphone array is one of the ways to record spatial sound. This paper proposes rigid spherical array for beamforming and mixed order ambisonics using MEMS sensors connected with TDM bus. MEMS sensors are used due to their small size. Digital output signal is transferred to external signal processor using time division multiplexing. This paper describes an approach to design of the array for beamforming using mathematical methods for node layout on a sphere and for ambisonics using spherical harmonic functions. For prototype realization there is created design with uniformly distributed microphones on the sphere. There are flexible printed circuit boards designs for connecting the microphones. Those boards are then connected to central printed circuit board, where are the signals converted to resp. from differential signal for transfer between the array and the signal processor. RJ-45 connectors are being used for this transfer. Microphones are connected to the buses by USB-C connectors. The result is framework solution including 3D model and printed circuit board designs for microphone connection. 3D model is designed in Fusion 360 software and printed circuit boards in KiCad.
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Audio files analysis application
Dřevojánek, Dalibor ; Schimmel, Jiří (referee) ; Přinosil, Jiří (advisor)
This bacherol thesis focuses on RIFF format files, their structure, processing, usage and creating an application, which is able to show the structure of these files and their simple editing. Application is developed using the C# programming language and .NET framework. It can show the structure of a file in a tree view, plot a waveform sotred in an audio file, edit values in some chunks, extract a chunk of a RIFF file, save it to another file and add or remove a chunk from a RIFF file. Application also contains a console version which can be used in evironments without graphical interface. It is developed using integrated development environment Rider from the company JetBrains s.r.o and git repository stored in cloud service GitHub was used for source code storage and preservation.
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Hardware Module for Interactive Control of Projects in PureData
Křivánek, Roman ; Krajsa, Ondřej (referee) ; Schimmel, Jiří (advisor)
In the work, there are basic theoretical information about the Arduino Uno R3 board. Then there are theoretical information about the components used. Furthermore, there is a chapter in the work where individual components are tested with the Arduino Uno R3 board. During the testing of the components, circuit diagrams and sample codes are provided to test the functionality of the components and modules. At the end of the work, there is a chapter on the design of the printed circuit board, which is the output of this work
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Active Noise Cancelling Headphones
Krištof, Viliam ; Sysel, Petr (referee) ; Schimmel, Jiří (advisor)
Technológia aktívneho potlačenia hluku (Active noise cancelling - ANC) pre slúchadlá je čoraz viac populárnejšia a má nesporne niekoľko výhod oproti pasívnemu potlačeniu hluku. Je to jeden z kľúčových prvkov k dosiahnutiu lepšieho a bezpečnejšieho počúvania v hlučnom prostredí. Aktívne potlačenie hluku v slúchadlách je realizované viacerými metódami, ktoré používajú analógové, digitálné či hybridné prevedenie pre dosiahnutie efektívneho potlačenie hluku. Cieľom tejto bakalárskej práce je preštudovať technológiu aktívneho potlačenia hluku, jej metodiku a topológie používané pre slúchadlá a postaviť a zhodnotiť funkčný prototyp ANC slúchadiel.
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Application for Demonstrating Principles of Hybrid Sound Synthesis
Prokop, Šimon ; Indrák, Michal (referee) ; Schimmel, Jiří (advisor)
The master thesis deals with the description and application of the main principles of sound signal generators contained in hybrid synthesizers. The individual methods and ways of generating audio signals were first studied and based on the theory, scripts were then created in Matlab to demonstrate the principle functions of the individual generators. Based on the logic of these scripts, a polyphonic hybrid synthesizer was created in VST3 format in the C++ language with the JUCE framework. The synthesizer allows the user to choose between basic readout methods Wavecycle and Wavetable, audio signal filtering or oversampling of the overall signal process.
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Experimental Audio Effect Based on Dynamic Signal Filtering
Leitgeb, David ; Miklánek, Štěpán (referee) ; Schimmel, Jiří (advisor)
The aim of this thesis is the implementation of an experimental audio effect based on dynamic signal filtering. Two implementations of the audio effect were made, the first one using the Matlab environment and its Audio Toolbox extension, and the second one in the C++ programming language using the JUCE framework. The main digital signal processing types present in the proposed audio effect include: frequency filtering, signal delay and modulation of parameters using low-frequency oscillators. The initial prototype of the audio effect mainly serves to verify correct functionality of the proposed algorithms. The result of the second implementation is a fully functional plug-in module usable, for example, for music production. Both versions are available in the VST format, which can be used with numerous digital audio workstations. The thesis is divided into three main parts: theoretical introduction, implementation of the audio effect, and demonstration of its functionality. Theoretical introduction describes several areas of digital signal processing which are crucial for the correct implementation of the individual components of the audio effect. Implementation of the proposed audio effect is described in the following part of this thesis. Description of the implementation in Matlab is mostly done by showcasing parts of the source code. The C++ version of the audio effect is for the most part described verbally. The last part of this thesis focuses on the demonstration of both versions of the proposed effect. This part features several graphical examples demonstrating various use cases of the proposed effect. Audio files corresponding to these examples are included in the appendix.
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Audio effect based on signal spectrum modification
Vejvoda, Zdeněk ; Sysel, Petr (referee) ; Schimmel, Jiří (advisor)
The thesis describes the design and the engineering solution of a hardware electronic sound effect that is a mixture of a frequency shifter and a delay effect. Electronic music intruments, sound effects and particularly modular synthesizer of the Eurorack standard are introduced. The firmware, developed utilizing the Max Gen environment and running on an ARM chip, prompted an examination of the Max platform. Finally, the thesis explores the calculations and processes required to construct a fully functional effect module. The device was assembled, tested and measured.
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