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Spectral analysis of Streicher and Bösendorfer pianos in the works of J. Brahms and F. Liszt
Pokorný, Marek ; Jirásek, Ondřej
This paper demonstrates the use of signal analysis methods, spectral analysis in particular, to illustrate the differences in musical timbre using two historical pianos from different eras and one contemporary piano as examples. The historical pianos in question are two 19th century grand pianos similar to those used by world-famous Romantic composers such as Franz Liszt and Johannes Brahms. The spectral analysis was performed using the MATLAB computing environment software in conjunction with the Steinberg Wavelab digital audio editor, and the grand piano samples were taken from the Pianoteq instrument VST plug-in developed by Modartt, which efficiently samples the real instruments for a near-identical piano sound and experience. The methods described in this article are suitable for analysing isolated tones as well as complex harmonies; depending on the specific application, the results can be interpreted in a number of ways.
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Electric guitar innovation
Blaha, Marek ; Skvaril, Šimon (referee) ; Jirásek, Ondřej (advisor)
The bachelor thesis deals with the innovation of the electric guitar and its timbre when changing different components in the chain. The thesis describes what parts the guitar consists of and how its pickup works. It also deals with the manufacture of these components and their subsequent assembly. The focus is on pickups, bridges and bodies. Each time a component is changed, the spectrum is analyzed. In the end, the final prototype is assembled and compared to the original guitar.
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Analysis of tonal inharmonic spectra
Sztefek, Jiří ; Mojdl, Edgar (referee) ; Jirásek, Ondřej (advisor)
The bachelor thesis focuses on the spectral analysis of samples of tonal inharmonic instruments and their spectra, with a detailed focus on the present overtones, their properties, waveforms, relationships and numerical ratios between each other, interval types and categorization into critical bandwidths. Eight samples of acoustic and five samples of artificial instruments were analysed as part of the work. The analysis of the samples was performed using Fourier transform in MATLAB with a focus on FFT spectra and spectrogram. The results of the work are intended for musicians or scientists concerned with inharmonic components in sound and their properties.
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Spectral analysis of historical pianos
Pokorný, Marek ; Indrák, Michal (referee) ; Jirásek, Ondřej (advisor)
This bachelor thesis focuses on the spectral analysis of historical pianos in aim to identify and compare their acoustic and spectral characteristics. Three examples of pianos were analysed, including a significant piano owned by the composer Leoš Janáček. The analysis was performed on measured piano samples using Fourier transformation in MATLAB, with an emphasis on spectral parameters such as spectral centroid, flatness, skewness, sharpness and roughness, and on the visual representation of a spectrum over time -- the spectrogram. The results of the spectral analysis were used to interpret and evaluate differences in timbre of the pianos and their probable causes. The theoretical part of the thesis provides a brief overview of the history and design of the piano, explains the spectral descriptors used, and examines the properties of musical tones and the influence of psychoacoustics on the perception of pitch and timbre.
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Possibilities of pathogen identification using MALDI-TOF mass spectrometry
Fusková, Lucie ; Strouhalová,, Dana (referee) ; Šalplachta, Jiří (advisor)
This bachelor thesis focuses on the utilization of MALDI-TOF MS technique for the identification of plant pathogens, specifically targeting molds of the genus Fusarium affecting cereals. Molds pose a serious threat to agriculture and the food industry. Current identification methods are time-consuming and often fail to provide precise results. Mass spectrometry offers a rapid and reliable alternative. Identification via MALDI is characterized by its high accuracy, sensitivity, and speed compared to commonly used methods. The thesis addresses the optimization of the method using cultured fungal strains and the identification of molds in infected cereals. The results of the study demonstrate the potential of utilizing MALDI technique for the identification of plant pathogens.
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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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The effect of optical fiber attenuation on the capacity of optical traces
Žák, Ondřej ; Škorpil, Vladislav (referee) ; Reichert, Pavel (advisor)
The essence of this thesis is the creation of complex insight on optic fibre attenuation. There is successive steps explained mechanism of optical attenuation and characterized its spectral dependence. We are describing primary elements of optical attenuation, its sorts and their own spectral dependence. Bachelor´s thesis is explaining requirements of transmission system to spectral characteristic optic fibre and influence of optic fibre attenuation on capacity of optical trace. Output of bachelor´s thesis is program solution of designed mathematical model for calcula-tion spectral dependence of optical attenuation. Program is realized in MATLAB and there is furthermore added version in Microsoft Office 1997-2003. Created program is able to ap-proximate points data obtained from measurement of optic fibre by using Lagrange interpola-tion polynomial and Rayleigh scatter interlay.
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Detection of face parts in the thermographic spectrum
Šujan, Miroslav ; Smékal, Zdeněk (referee) ; Mekyska, Jiří (advisor)
Master´s thesis deals with current problems of face detection and its parts in the infrared thermographic spectrum. Most previously published literature deals with the detection in the visible spectrum, making the thermographic detection range an interesting alternative. The work deals with the processing of image signals, images and faces in thermographic spectrum, selected methods of face detection and its parts and also deals with practical system design for detecting facial parts in this spectrum and its subsequent testing.
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Longitudinal structures in optical fibres with the use in sensorics
Falešník, Vlastimil ; Čučka, Milan (referee) ; Urban, František (advisor)
This semestral work describes key concepts, principles and basic characteristics of optical fibers. Furthermore, the principles of phase mask and subsequent records of perpendicular or tilted structures in fiber are being discussed. The work also introduces the use of such structures in sensorics as well as its connection to Bragg grating. Considerable part of this thesis is dedicated to analysis and production of longitudinal structures in fibers.
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