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1
Content available remote Assessment Effects of Humidification of Guitars by Complexity Measures of the Sound Level During Sustain
Stępień Robert, Wrzeciono Piotr
Archives of Acoustics
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2024
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Vol. 49, nr 2
189--197
EN
Air humidity significantly affects the sound of wooden instruments. The sound quality decreases when the instrument is exposed to low humidity for an extended period. Therefore, the instrument is treated with a humidifier to improve sound quality. This study aimed to verify the effectiveness of the humidification process by analyzing the quality of guitar sound with the methods used in signal complexity studies, such as Higuchi’s fractal dimension (HFD), symbolic analysis, and empirical mode decomposition (EMD). The sound quality was determined by the sound levels measured before, during, and after the guitars’ humidification. The methods used consistently confirmed the improvement of the guitar sound quality after the humidification process. Moreover, it was concluded that the sound quality changes irregularly during the humidification process.
2
Content available Multimodalne pomiary drgań struny
Stefaniak Marta, Nosorowski Witold
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
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2019
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Nr 68
53--56
PL
W artykule zostały przedstawione badania drgań struny zrealizowane przy użyciu szybkich kamer wizyjnych, mikrofonu oraz akcelerometru. Obiektem badań były instrumenty muzyczne. Opisano zjawiska zachodzące w instrumencie podczas tworzenia się i wydobywania z niego dźwięku. Celem pracy było zbadanie różnic w wynikach otrzymanych poprzez pomiary wykonane z użyciem zróżnicowanych reprezentacji obrazowych i sygnałowych. Zaproponowano sposób pobudzania instrumentu, który pozwolił na wykonywane badań w sposób powtarzalny. Opisano metodologię wykonanych pomiarów oraz algorytm do analizy pomiarów wykonanych metodą optyczną, który umożliwił przetworzenie zarejestrowanego obrazu na sygnał foniczny. Na koniec zaprezentowano otrzymane wyniki z wszystkich modalności oraz wnioski z analiz.
EN
The article presents string vibration measurements carried out using fast vision cameras, a microphone and an accelerometer. Various types of acoustic guitars were selected for testing. The phenomena occurring in the instrument during the creation and extraction of sound from it were described. The aim of the study was to examine the differences in the results obtained through measurements made with different modalities and to determine which method gives the most accurate results. The measurements were carried out in an anechoic chamber, due to the need to maintain the closest possible ambient conditions during all measurements. A method of stimulating the instrument was proposed, which allowed for repeated tests. High-speed industrial cameras have enabled the recording of vibrations of selected points of the measured object. The work describes the methodology of measurements taken and the algorithm for analyzing measurements made using the optical method, which enabled the recorded image to be converted into an audio signal. The process of developing measurement data was discussed. Finally, the results obtained from all modalities and conclusions from the analyses were presented, and the possibilities of further experiments were proposed.
3
Content available Applicability of the Capstan Equation to Guitar Strings
Groves Tom, Kemp Jonathan A.
Archives of Acoustics
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2019
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Vol. 44, No. 3
459--465
EN
The effects of friction were observed in electric guitar strings passing over an electric guitar saddle. The effects of changing the ratio of the diameter of the winding to the diameter of the core of the string, the angle through which the string is bent, and the length on either side of the saddle were measured. Relative tensions were deduced by plucking and measuring the frequencies of vibration of the two portions of string. Coefficients of friction consistent with the capstan equation were calculated and were found to be lower than 0.26 for wound strings (nickel plated steel windings on steel cores) and lower than 0.17 for unwound (tin plated steel) strings. The largest values of friction were associated with strings of nar rower windings and wider cores and this may be due to the uneven nature of the contact between the string and saddle for wound strings or due the surface of the windings deforming more, encouraging fresh (and therefore higher friction) metal to metal contact. It is advised to apply lubrication under the saddle to string contact point after first bringing the string up to pitch rather than before in order to prevent this fresh metal to metal contact.
4
Naprawiać czy wymieniać na nowe?
Błachowicz K., Langner M.
Recykling
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2017
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nr 3
86--88
PL
Z Michałem Langnerem, prowadzącym serwis i naprawę gitar (Guitar Service & Repairs), rozmawia Katarzyna Błachowicz.
5
Content available Evaluation of Guitars and Violins Made using Alternative Woods through Mobility Measurements
Torres J. A., Torres-Martínez R.
Archives of Acoustics
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2015
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Vol. 40, No. 3
351--358
EN
The feasibility of substituting the types of wood usually employed in the making of guitars and violins was analyzed, but without comparing the properties of involved materials as it is often reported; in this work, the vibrational behavior of twelve guitars and three violins built with alternative types of woods was compared to data of classical instruments available in the literature. In the guitars here measured, the back plate and ribs were not made from traditional woods; while in the violins, only the top plate was made from an alternative type of wood. The results showed that changing the wood of back plate and ribs does not radically affect the typical mobility of a guitar; however, the expected mobility for a violin was not clearly obtained substituting the wood of the top plate. Thus it seems feasible to substitute the wood of back plate and ribs in guitars without causing dramatic changes in their performance; in contrast, a change of the wood type for top plate in violins seems inadvisable unless the design of the top plate is modified to compensate the differences between the woods.
6
Content available Guitar playing robot, a tool assisting instrumental research
Tokarczyk D., Pluta M., Wiciak J.
Mechanics and Control
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2014
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Vol. 33, no. 3
75--82
EN
This article is about the use of an automatic mechanism able to play an instrument in research about playing repeatability. Repeatability in this case refers to the time intervals between played notes in sequences. The subject will be discussed based on a guitar playing robot. During the research with the use of guitar playing robots, some conclusions were made that confirm that humans are unable to play sound sequences twice while maintaining high repeatability. It has also been proven that the use of a robotic musical instrument (RMI) helps obtain playing repeatability of sound sequences much more accurately than that obtained by a human musician.
PL
Artykuł omawia zastosowanie automatycznego mechanizmu, grającego na instrumentach, w badaniach dotyczących powtarzalności gry. W tym wypadku powtarzalność odnosi się do odstępów czasowych pomiędzy odgrywanymi w sekwencji dźwiękami Podczas przeprowadzonych badań z wykorzystaniem robotów grających na gitarze uzyskano wyniki świadczące o tym, że człowiek nie jest w stanie zagrać dwukrotnie sekwencji dźwięków z zachowaniem wysokiej powtarzalności. Wykazano również, że zastosowanie instrumentu robomuzycznego (RMI) pozwala uzyskać powtarzalność odgrywanej sekwencji o wiele wyższą niż uzyskaną przez człowieka.
7
Content available remote The signal analysis of sound based on the application of guitar tabulatures for mobile devices
Solecki P., Zabierowski W.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 10b
239-242
EN
These The paper presents application for mobile devices which provides real time guitar tunning and analysis of tabulatures. This functionality requires algorithms to extract harmonic components of sound. This application is destinated for Symbian operating system with S60 interface. It consists of two important parts: application core created in Symbian C++ and user interface dedicated for Symbian Qt which provides support for this platform with integration to the S60 framework.
PL
Artykuł prezentuje aplikację przeznaczoną dla urządzeń mobilnych, która zapewnia strojenie gitary w czasie rzeczywistym oraz zapis tabulaturowy. Aplikacja przeznaczona jest dla systemu operacyjnego Symbian S60. Składa się z dwóch zasadniczych części: rdzenia aplikacji zrealizowanego w technologii Symbian C++ oraz interfejsu graficznego dedykowanego dla Symbian Qt, który zapewnia wsparcie dla tej platformy i integrację z frameworkiem S60. Narzędzie to przesuwa granicę zastosowań smartfonów i stanowi alternatywę dla komercyjnych stroików gitarowych.
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