Improved Source Characteristics of a Handclap for Acoustic Measurements: Utilization of a Leather Glove

Vos, H P J C De; Papadakis, Nikolaos M.; Stavroulakis, Georgios Ε.

doi:10.3390/acoustics2040045

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…Before the measurements were conducted, the loudspeaker was evaluated by the authors to ensure that everything was in order with its operation [5]. Although a dodecahedron speaker is typically employed, alternative acoustic sources are also accessible for a variety of reasons (e.g., high cost, transportation difficulties, availability) [32][33][34]. For both methods, the same source and microphone positions were used, according to ISO 3382-1 [5].…”

Section: Measurementsmentioning

confidence: 99%

Effects of Varying Levels of Background Noise on Room Acoustic Parameters, Measured with ESS and MLS Methods

Papadakis,

Antoniadou,

Stavroulakis

2023

Acoustics

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Typically, background noise of different types and levels is present during the measurement of the impulse response in spaces. The two methods that are, in practice, most frequently used in the measurement of the impulse response, are the exponential sine sweep (ESS), and the maximum length sequence (MLS). This study’s objective was to estimate the impact of background noise (white noise, tonal noise) on the acoustic parameters (T30, EDT, C80, and D50) for ESS and MLS measurements, by introducing artificial background noise, employing an external sound source. For this purpose, measurements were performed with varying levels of external noise (in steps of 2 dB), and the effect was assessed, using the relative error compared to measurements without artificial background noise. According to the findings for white noise (as background noise), in the case of T30 and EDT, the difference between the two methods, as well as the relative error, for the initial levels of added background noise, was small. However, for higher levels of added background noise, there was a sharp increase in the relative error, which was greater for the ESS method, both for T30 and EDT. Regarding C80 and D50, while initially the differences between the ESS and MLS methods were small, cumulatively, as the background noise increased, the relative error increased for both methods, with the ESS method showing the largest error. In the case of tonal noise (as background noise), the results were consistent with those observed in the case of white noise. The study’s findings contribute to a better understanding of the ESS and MLS methods, and suggest the expected relative error of acoustic parameters when various types and levels of background noise are present. Additionally, the study suggests, based on background noise and level, the optimum method to conduct impulse response measurements.

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Section: Measurementsmentioning

confidence: 99%

Effects of Varying Levels of Background Noise on Room Acoustic Parameters, Measured with ESS and MLS Methods

Papadakis,

Antoniadou,

Stavroulakis

2023

Acoustics

Self Cite

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“…The audio interface that was used was ONYX 400F (Mackie, Washington, DC, USA). Alternative sources are also available [35] and applied for a variety of reasons [36][37][38]. Matlab R2021a (Mathworks, Massachusetts, USA) software was used for the measurements and also for the analysis of the results (the extraction of impulse responses via fast Fourier transforms).…”

Section: Acoustic Measurementsmentioning

confidence: 99%

FEM Investigation of the Air Resonance in a Cretan Lyra

Papadakis,

Nikolidakis,

Stavroulakis

2023

Vibration

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Cretan lyra is a stringed instrument very popular on the island of Crete, Greece, and an important part of its musical tradition. For stringed musical instruments, the air mode resonance plays a vital part in their sound, especially in the low frequency range. For this study, the air mode resonance of a Cretan lyra is investigated with the use of finite element method (FEM). Two different FEM acoustic models were utilized: First, a pressure acoustics model with the Cretan lyra body treated as rigid was used to provide an approximate result. Secondly, an acoustic–structure interaction model was applied for a more accurate representation. In addition, acoustic measurements were performed to identify the air mode resonance frequency. The results of this study reveal that the acoustic–structure interaction model has a 3.7% difference regarding the actual measurements of the resonance frequency. In contrast, the pressure acoustics solution is approximately 13.8% too high compared with the actual measurements. Taken together, the findings of this study support the idea that utilizing the FEM acoustic–structure interaction models could possibly predict the vibroacoustic behavior of musical instruments more accurately, which in turn can enable the determination of key aspects that can be used to control the instrument’s tone and sound quality.

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FEM Investigation of the Air Resonance in a Cretan Lyra

Papadakis,

Nikolidakis,

Stavroulakis

2023

Preprint

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Cretan lyra is a stringed instrument very popular on the island of Crete, Greece and an important part of its musical tradition. For stringed musical instruments, the air mode resonance plays a vital part in their sound, especially in the low frequency range. For this study, the air mode resonance of a Cretan lyra is investigated with the use of finite element method (FEM). Two different FEM acoustic models were utilized: first, a pressure acoustics model with the Cretan lyra body treated as rigid was used to provide an approximate result; secondly, an acoustic-structure interaction model was applied for a more accurate representation. In addition, acoustic measurements were performed to identify the air mode resonance frequency. Results of this study reveal that the acoustic-structure interaction model has a 3.7% difference regarding the actual measurements of the resonance frequency. In contrast, the pressure acoustics solution is approximately 13.8% too high compared with the actual measurements. Taken together, findings of this study support the idea that utilizing FEM acoustic-structure interaction models could possibly predict more accurately the vibroacoustic behavior of musical instruments, which in turn can enable the determination of key aspects that can be used to control the instrument’s tone and sound quality.

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Improved Source Characteristics of a Handclap for Acoustic Measurements: Utilization of a Leather Glove

Cited by 4 publications

References 8 publications

Effects of Varying Levels of Background Noise on Room Acoustic Parameters, Measured with ESS and MLS Methods

Effects of Varying Levels of Background Noise on Room Acoustic Parameters, Measured with ESS and MLS Methods

FEM Investigation of the Air Resonance in a Cretan Lyra

FEM Investigation of the Air Resonance in a Cretan Lyra

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