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Analiza akustičnih lastnosti bobnov na osnovi razpada lastnih frekvenc
ID Mikulan, Anže (Author), ID Prezelj, Jurij (Mentor) More about this mentor... This link opens in a new window

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Abstract
V zaključni nalogi smo se osredotočili na prepoznavanje in analizo motečih resonančnih frekvenc malega bobna ter na razumevanje mehanizma njihovega nastanka. V ta namen smo v gluhi sobi posneli impulzne odzive pri različnih uglasitvah bobna ter jih primerjali glede na različne tehnike udarjanja s palico. Iz posnetih impulznih odzivov smo s časovno-frekvenčnimi metodami, temelječimi na Fourierjevi transformaciji in konvolucijskih tehnikah, izluščili spektrogram razpada zvoka. Ta pristop je omogočil natančen vpogled v frekvenčni spekter in časovni potek razpada amplitud posameznih frekvenc. Analizo smo izvedli s programom, razvitem v okolju Matlab, ki samodejno obdeluje podatke z uporabo časovno obrnjenega signala. Na podlagi rezultatov smo identificirali problematične frekvence, določili njihove amplitude ter opisali njihovo časovno obnašanje glede na tip udarca in napetost membrane.

Language:Slovenian
Keywords:zvok, Fourierjeva transformacija, časovno obrnjeni signal, dušenje, frekvenčni odziv, časovno frekvenčna analiza
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Year:2025
PID:20.500.12556/RUL-174033 This link opens in a new window
UDC:534.6:534.83:517.443
COBISS.SI-ID:250879491 This link opens in a new window
Publication date in RUL:26.09.2025
Views:123
Downloads:36
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Secondary language

Language:English
Title:Analysis of drum characteristics depending on the resonance frequency decay
Abstract:
In this work, we investigate the identification of disturbing resonant frequencies in snare drum sounds and analyze the mechanisms behind their generation. The experimental work involved recording impulse responses of a snare drum under different tuning conditions in an anechoic chamber, comparing various striking techniques. Using Fourier transformation and convolution techniques, we generated spectrograms from the captured impulse responses to visualize the frequency spectrum and time decay of individual frequency components. The analysis was performed using a custom-developed Matlab program implementing a time-reversed signal processing method for automated decay characterization. Our results successfully identify problematic frequency ranges, quantify their amplitude characteristics, and determine how their decay behavior varies depending on striking techniques and membrane tension. This systematic approach provides valuable insights into the acoustic properties of snare drums and offers a methodology for identifying and analyzing undesirable resonant frequencies in percussion instruments.

Keywords:sound, Fourier transformation, time-reversed signal, damping, frequency response, time-frequency analysis

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