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Loudspeaker Box with Variable Crossover Frequency
Tomášek, Martin ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
This bachelor´s thesis deals with middle-sized loudspeaker system in D´Appolito configuration. The aim of this thesis is to design and to realize the loudspeaker system, which includes selection of suitable loudspeakers and their position in designed baffle including design of variable crossover frequency. The text is divided into a few sections, where are the points of this project described. In the first half there are briefly described basic principles of loudspeakers and design loudspeaker systems, especially 2-way loudspeakers, and specific properties of D´Appolito configuration. Then there are described principles of frequency crossovers used in loudspeaker systems and what is expected for their construction. In the second half, there is described realization of baffle itself and variable frequency crossover. Because this thesis concurs to semestral thesis, there is also a chapter about simulation. In the end there are diagrammatized the measured data of frequency and dispersion characteristics and a few dispersion characteristics for different crossing frequences.
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Implementation of digital sound synthesizer in VST technology
Paukeje, Ján ; Schimmel, Jiří (referee) ; Mačák, Jaromír (advisor)
This thesis is focused on synthesis of audio signals and algorithm implementation by the help of technology designed for real-time processing. Analyzing individual methods of sound synthesis, the MIDI communication protocol and procedure of real-time signal processing. It is developed an appropriate software simulation ,on ground of studying these aspects, implemented by using C++ language. A result of this work is sound generator supporting MIDI protocol as a plug-in module designed for Windows platforms.
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MIDI Controller for DAW Software Control
Korytář, Matěj ; Číž, Radim (referee) ; Schimmel, Jiří (advisor)
This thesis focuses on problematics of DAW controllers for sound production software. In this thesis is analysed Mackie Control protocol, one of used communication protocols. There is also an overview of MIDI messages, because Mackie Control protocol is based on MIDI protocol. The thesis contains two own DAW controller designs. First one is based on Mackie Control protocol, second one is based on Generic Remote which offers better customization.
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Application for measurement of audio effects
Frenštátský, Petr ; Schimmel, Jiří (referee) ; Mačák, Jaromír (advisor)
The term paper is focused on the implementation and description of the application for the measurement of sound effects, which are implemented as plug-ins. Application measures in the time domain impulse response, transfer characteristics of dynamic effects. Application also shows the waveforms of attack and release time. In frequency domain application measures the frequency spectrum of the signal and frequency response of the system. The application is accompanied by the measurement of external effects by ASIO interface.
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Simulation of Sound Field of Multiple Sound Sources
Kohoutek, Jan ; Kurc, David (referee) ; Schimmel, Jiří (advisor)
The main task of this bachelor thesis is description of interaction of sound waves in field. To understand the whole topic important physical laws related to sound waves propagation are defined. It also deals with frequency and directional response of ideal point source which compares with real measured responses of direct-radiating electrodynamic loudpeaker. Thesis are shown some examples of sound fields on which are specified their behavior. It also desribe main properties for right functionality of line-array source. In practical part are measured acoustic pressure values which lead to creating a interpolation map of sound pressure level. This obtained map was compared with theoretical acoustic field. Part of this bachelor thesis is program which enable to simulate acoustic field created under variable sound and environment properties.
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Three-way stereo speaker system with bassreflex
Burget, Jan ; Schimmel, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor‘s thesis contains complete design of three-way stereophonic loudspeaker sound system with bassreflex. There is detailed description of selection of acoustic transducers, their measurements and adjustments. As an integral part of this seminar study is design of loudspeaker baffle and calculations or simulation of bassreflex. And further,this study also deals with a design of loudspeaker crossovers and their simulation. The study contains structural elements as a PCB (printed circuit board) or 3D pattern and drawings of loudspeaker box. KEYWORDS
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Design and implementation of MIDI driver
Jirčík, Zdeněk ; Slanina, Martin (referee) ; Schimmel, Jiří (advisor)
This bachelor thesis describes design and implementation of a MIDI controller that will transmit messages to MIDI program change and MIDI continuous messages that the value of the MIDI controller standard type. The theoretical part describes communication using the MIDI protocol, its implementation in microprocessor and controls the LCD controller. The practical part deals with the design and implementation of the MIDI controller. The result of this work is a circuit diagram, PCB, microprocessor control program and construction of MIDI controller.
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Compensation of Loudspeaker Frequency Response for a Wider Listening Area
Beránek, Šimon ; Říha, Kamil (referee) ; Schimmel, Jiří (advisor)
This bachelor thesis studies problematics of calculating average impulse responses of rooms. Measuring signals like MLS or linear/exponential sine sweep are described. Basic methods of interpolation are explained and their applicability in frequency response calculations is described. Digital filters are explained as a tool for frequency response equalization. First part of this thesis tests methods of interpolation on 64 measured impulse responses. These methods have been further optimized and one was chosen to calculate the average impulse response for each of the measured rooms. Second part consists of AB*X listening tests deployed to find subjective aural differences of the interpolated impulse responses and few of the measured impulse responses. These interpolated impulses responses were further compensated using a warped filter library.
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Control of Bang&Olufsen Products Using Bluetooth Technology
Mandík, Martin ; Hanák, Pavel (referee) ; Schimmel, Jiří (advisor)
This master thesis deals with the creation concept of the Bluetooth module and applications for mobile phone and PDA. After the connection of the concept with remote control, enable extend of control the Bang&Olufsen products with using mobile phone or PDA. Applications in mobile phone or PDA will communicate to the concept of using Bluetooth technology. The result of this thesis is the creation of printed circuit boards and applications for mobile phone and PDA.
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