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Design of Hearing Aids in LabVIEW
Macíček, Ondřej ; Tannenberg, Milan (referee) ; Sekora, Jiří (advisor)
This thesis contains the block diagram of hearing aid, anatomy description of human hearing system and description of most important physical values in this problematics of hearing and sound. There are analyzed several types of hearing tests for diagnosis of the hearing loss level and some types of algorithms, which fit the frequency characteristic of patient's hearing loss too. Further this thesis contains interactive program of hearing aid, which has implemented equations for sound equalization.
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LabVIEW instrument control toolbox
Mazal, Ctibor ; Aboelhassan, Mustafa Osman Elrayah (referee) ; Blaha, Petr (advisor)
This diploma thesis is containing the description of the LabVIEW Instrument Control Toolbox project. Initial preparations like the development environment choosing process, as well as the instrument driver layer choice are present along with the project requirements. A signal approach to the instrument control is defined and described in detail. This thesis also contains the main project development in The National Instruments LabVIEW and at the end, a detailed description and user guidance for each developed and fully integrated toolbox module.
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Synthesis of the musical audio signal using direct generation of harmonics
Ježek, Štěpán ; Mekyska, Jiří (referee) ; Přikryl, Lubor (advisor)
This thesis is focused on musical sound synthesis, in particular, the method of additive synthesis. The main goal is to implement a software musical instrument in the VST3 plug-in format, using the C++ programming language and the JUCE application framework. The final program offers spectral components editing capabilities and is able to morph between user-defined spectrum states in time. The introduction summarizes some common synthesis methods and their advantages or disadvantages. Next section deals with the technology used during the VST3 plug-in implementation and describes core parts that make up the final application. This analysis is focused mainly on the signal processing part, but there is also a brief description of the graphical user interface.
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The influence of alcaline accumulators loading on their parameters
Čech, Ondřej ; Vrbický, Jiří (referee) ; Sedlaříková, Marie (advisor)
This master's thesis deals with alkaline battery characteristics and it has special consideration of nickel-cadmium cells. There are three main experimental parts in this paper. First one is concerned with positive electrode materials properties and is aimed to investigate impact of magnesium ions formed into nickel hydroxide electrode structure. Second part deals with battery charging/discharging and response measurement tool design. National Instruments hardware PXI modules for data acquisition was used and program in LabView environment was made. Last one is concerned with nickel-cadmium cell properties changes during increased temperature stressing. Investigation of cell self-charge changes during lithium hydroxide addition into electrolyte was made.
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Measurement of the properties of operation amplifier
Lacko, Michal ; Sekora, Jiří (referee) ; Kolář, Radim (advisor)
This thesis includes a survey of operation amplifiers used for biological signal measurement. The first part is focused on the description of amplifier’s properties which are important in biomedical engineering. The next part describes several applications (virtual instruments) which measure selected properties. These applications are created with the help of the programming environment LabView 7.1, the measuring card NI PCI-6221 and a suggested product. The project includes four applications: measuring of frequency characteristics, automated measuring of frequency characteristics, measuring of input offset voltage, and measuring of common-mode rejection.
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ECG signal generator
Štohanzlová, Petra ; Sekora, Jiří (referee) ; Harabiš, Vratislav (advisor)
This work deals with the generation of ECG signal and options how to generate it using the LabVIEW program. On the basis of the studied methods of describing signal was chosen method making use of the similarity of the sections of ECG curve and the sinus respectively triangular pattern. This method was subsequently implemented in the LabVIEW environment. Created virtual instrument generates ECG signal in given heart rate and adjustable amplitude of waves. It is also possible to choose between 12 standard leads, to realize several failures of cardiac activity and various disturbance signals can be added to the signal. Signal can be sent to output or saved as a text file in real time in the specified format.
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Digital signal processing in real time
Zamazal, Zdeněk ; Mačák, Jaromír (referee) ; Rášo, Ondřej (advisor)
This work deals with digital signal processing in the field of adaptive filtering. Fundamental basics of adaptive filtering are described and primary aim is to create executable laboratory examples, using adaptive filtering, in LabView programming language. These laboratory examples are intended to be used by students fo studying and during laboratory lessons. Objective is to connect the examples with external devices, such as microphone. A microphone is used as an user's speech input acquiring interface. In the thesis is depicted Wiener's filter and problem of adaptive filtering is discussed. Contemporary adaptive algorithms are described and their applications as well. Most mentioned is the LMS algorithm and it's forms. Laboratory examples use following concepts: Adaptive Echo Cancellation, Active Noise Control and System Identification. Each of these examples is solely executable (need for LabView or Run-time engine), consisting also of theory with diagrams. Examples therefore are usable even without manual.
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Spirometry in LabVIEW
Pernicová, Lenka ; Dřínovský, Jiří (referee) ; Harabiš, Vratislav (advisor)
This bachelor thesis deals with a method of Pulmonary Function Tests called Spirometry. It consists of two parts. The first part introduces individual methods of lung function testing and examines characteristics that describe work of lungs regarding a spirometric curve. The second part based on the characteristics examined in the previous part is focused on implementation of a spirometer within the graphical environment of LabView. The implemented virtual tool is able to show a spirometric curve and to analyse particular characteristics. The corresponding signal and even the analysed characteristics can be saved in a given format into appropriate files.
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Synthesis of the musical audio signal using direct generation of harmonics
Ježek, Štěpán ; Mekyska, Jiří (referee) ; Přikryl, Lubor (advisor)
This thesis is focused on musical sound synthesis, in particular, the method of additive synthesis. The main goal is to implement a software musical instrument in the VST3 plug-in format, using the C++ programming language and the JUCE application framework. The final program offers spectral components editing capabilities and is able to morph between user-defined spectrum states in time. The introduction summarizes some common synthesis methods and their advantages or disadvantages. Next section deals with the technology used during the VST3 plug-in implementation and describes core parts that make up the final application. This analysis is focused mainly on the signal processing part, but there is also a brief description of the graphical user interface.
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Production of popular music using virtual instruments
Mottl, Jaroslav ; Vondra, Zdeněk (advisor) ; Doškář, Josef (referee)
This thesis deals with technological possibilities of music production with virtual instruments, it as well shows replicable method which the reader can use to create their own composition. In the theoretical part, technology which is used to create music with virtual instruments is explained. Practical part consists of the manual which shows how to produce this type of music accompanied with audio appendix.
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