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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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The influence of the diameter and depth of the hole in the whistle on the timbre and directionality
Borovičková, Barbora ; Mojdl, Edgar (referee) ; Jirásek, Ondřej (advisor)
This bachelor’s thesis examines the influence of the diameter and depth of the holes in the recorder on the timbre and directionality of the resulting tone. For measurements and subsequent data analysis, nine flute body prototypes were made from three different materials and with three different wall thicknesses. During the measurement, holes with different diameters were drilled into the prototypes. Thanks to this procedure, it was possible to separate desirable influences from undesirable ones. The measured data were analyzed in the Matlab environment.
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The Analysis of mutes on trombone and trumpet timbre
Košař, Vojtěch ; Mojdl, Edgar (referee) ; Jirásek, Ondřej (advisor)
This work deals with the sound mute issues, specifically how they affect the timbre of a trombone and a trumpet, their sound spectrum, levels of individual harmonic tones, the presence of formants and the directional characteristics of individual tones played in various dynamics. A part of this work is also focused on the theoretical description of a trombone and a trumpet, including their brief history, their classification, the parts they are consisting of and the timbre. The theoretical part is further dealing with the description of mathematic functions like FFT or LPC analysis, which have been implemented in the MATLAB environment when creating the graphic dependents for this theme.
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The Spectrum analysis of different types of saxophones
Greiplová, Barbora ; Mojdl, Edgar (referee) ; Jirásek, Ondřej (advisor)
The bachelor thesis deals with the sound of three types of Yamaha saxophones, specifically soprano, alto and tenor saxophone. Lists the basic parameters of the instrument, how it forms the tone and how it is typical. It focuses on characteristics in its tone using spectral analysis, LPC analysis and directional characteristics. The work focuses on the common properties of saxophones as instruments, it also looks for differences between selected types of saxophones and between individual tones. The results are compared in graphs, tables and verbal evaluation.
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The analysis of the clarinet spectrum from different manufacturers
Suchánek, Tomáš ; Mojdl, Edgar (referee) ; Jirásek, Ondřej (advisor)
Bachelor’s thesis focuses on spectral analysis of six B clarinets made by manufacturers Buffet Crampon, RZ Woodwind Manufacturing and Yamaha. Instruments were tested by two professional musicians with different timbral preferences and the resulting spectrum is then applied to how psychoacoustic measurements define timbre perception. Furthermore, the impact of different dynamics or reeds is discussed and significant part of analysis also describes directivity patterns of individual higher harmonics or characteristic formant areas.
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Experimental Electro-Mechanical Musical String Instrument
Svěrák, Jan ; Mojdl, Edgar (referee) ; Dlouhý, Dan (advisor)
The goal of this thesis is to design and construct a prototype of an experimental electromechanical musical instrument of unusual construction and a plethora of achievable timbres. The design is based on a combination of fundamental attributes of two already existing instruments, namely the hurdy-gurdy and the electric guitar. The first chapter of this thesis analyzes the theoretical background of said problematics. The second chapter describes the construction and function of individual components, including the reasoning behind the chosen principles and materials. The third chapter describes the changes from the original design and the process of building the instrument. The fourth chapter evaluates the instrument in terms of functionality and its properties. The fifth chapter proposes changes in design which could eliminate or mitigate the problems revealed by the prototype.
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