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Analysis of pitch perception depending on the spectrum
Slávik, Martin ; Indrák, Michal (referee) ; Jirásek, Ondřej (advisor)
This thesis is dealing with the research of the influence of individual harmonic components on the perception of sound height. As a part of the work has been made an internet questionnaire on a web address www.analyzavyšek.9e.cz, where individual respondents completed listening test compound of 46 samples. This experiment is based on semantic differential method. Individual samples are compound of sine wave – tone and examined sample, which respondents evaluates on three bipolar scales. The samples were either modelled by additive synthesis or modified sampled sounds of instruments. Individual samples were divided to four major groups and other minor groups for clarity. The purpose was to find which parts, combinations and harmonic components of sound and tone can affect perception of tone height.
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Analysis of the spectrum of cymbals and their time envelopes
Adamják, Adam ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
This Bachelor Thesis deals with the analysis of idiophones, the description of the measuring chain, and the analysis of the spectrum and time course of the measured samples. Based on spectral analysis, individual parameters and influences on the sound of cymbals were evaluated, such as the location of the blow or the type and hardness of the drum sticks. The theoretical basis also deals with the basic theory of the sound signal to the issue of noise and psychoacoustic perceptions. The conclusion deals with the basic mechanical properties and puts them into context with spectral analysis.
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The Spectrum analysis of different single drums from a drum set differently tuned and played by different drumsticks
Cvetler, Dominik ; Mojdl, Edgar (referee) ; Jirásek, Ondřej (advisor)
The bachelor thesis deals with the analysis of the spectrum of membranophones, more precisely drums from the drum kit. Spectrum analysis evaluates aspects that affect the instrument’s spectrum, especially its inharmonicity and the generation of noise or tone modes. The aspects examined are the impact of the drumsticks hardness, the impact hit point on the drum membrane, the tuning of the resonance membrane and the presence of the tailpiece. The thesis examines inharmonicity in the spectrum with harmonic ratios between individual components in bands of harmonic series. The thesis also describes individual drums in terms of organology, drumsticks and membranes used for drums, the theoretical basis of creating membranophones sound and the way in which the measured samples were recorded and processed.
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The analysis of psychoacoustic perception of chords composed from different full and variously colored signals
Vejmělka, Daniel ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
This thesis is dealing with the impact of frequency spectrum of musical sounds on psycho-acoustical perception of the listener. It studies how differently filled harmonic spectrums can influence listener’s ability to determine individual notes in a chord and what influence, on recognizability of a chord, inharmonic elements have. It explores different methods of psycho-acoustic measurements and further data processing. The experiment is based on a method of paired comparisons and was realized in a form of listening test with more than 100 participants. The test is focused on typical representatives of different groups of musical instruments. It studies the impact of different colors of sound used in different types of chords. It further deals with statistical processing of the recovered data.
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Analysis of Time-Varying Spectrum of Pianos
Smělý, Pavel ; Rajmic, Pavel (referee) ; Jirásek, Ondřej (advisor)
This work focuses on an analysis of a time-varying spectrum of pianos. The beginning of the work deals with the gradual evolution of the piano, aiming at timbre and design, and it analyzes in detail its individual parts and their influence on the sound spectrum. The theoretical part also concentrates on the issue of harmonic analysis in both the musical conception of timber and the usage of mathematical signal processing methods that make this analysis possible. Another part deals with practical tasks of the work such as a description of an application and functions created in the interface of MATLAB for exploring the time-varying spectrum of tones, description of the method and procedure of the measuring of three concert grand pianos. The work also analyzes, by supporting it with practical examples and by comparing the measured pianos, the most important acoustic phenomena that originate from the production of tones in the instrument; it describes the timber of individual instruments, and it gives recommendations.
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