Autor: Pavlović, D. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Formation of Scattering Characteristics for Acoustical Ray Tracing Simulation
Autorzy:: Bojičić, S.
Šumarac-Pavlović, D.
Mijić, M.
Powiązania:: https://bibliotekanauki.pl/articles/178159.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: diffuse reflection
ray tracing
room acoustics
secondary source
scattering pattern
Opis:: Ray tracing simulation of sound field in rooms is a common tool in room acoustic design for predicting impulse response. There are numerous commercial engineering tools utilising ray tracing simulation. A specific problem in the simulation is the modelling of diffuse reflections when contribution of individual surface is prevailing. The paper introduces modelling of scattering which is interesting when the whole impulse response of a room is not a goal but contribution of certain surface. The main goal of the Project is to shape directivity characteristics of scattered reflection. Also, an innovative approach is suggested for converting the energy histogram information obtained by ray tracing into an “equivalent impulse response”. The proposed algorithm is tested by comparing the results with measurements in a real sound field, realised in a scaled model where a diffusing surface is hardware-implemented.
Źródło:: Archives of Acoustics; 2018, 43, 4; 657-667
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Transfer Characteristics of Vocal Tract Closed by Mask Cavity
Autorzy:: Vojnović, M.
Mijić, M.
Šumarac Pavlović, D.
Powiązania:: https://bibliotekanauki.pl/articles/177542.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: mask
transfer characteristics
vocal tract
Opis:: This paper analyses the changes in transfer characteristics of the vocal tract when closed by a mask, i.e. a chamber. The analysis was performed in two ways: by analytical estimation and by measurements in the vocal tract physical model for the case of mask with inner volume V = 430 cm³, corresponding to the oxygen masks used in combat airplanes. It was shown that closing the vocal tract with a mask cavity increases the first formant frequency by about 10% in front and high vowels (/e/, /i/, and /u/) and the frequencies of the first two formants by about 5% in the remaining two vowels (/a/ and /o/). It was also revealed that longitudinal and transversal resonances in the mask chamber can lead to errors in the recognition of the vowel formant frequencies. The results point to the need for additional knowledge about resonances in mask application.
Źródło:: Archives of Acoustics; 2018, 43, 2; 307-311
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

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