Impact of Wall Impedance Phase Angle on Indoor Sound Field and Reverberation Parameters Derived from Room Impulse Response
Accurate definition of boundary conditions is of crucial importance for room acoustic predictions because the wall impedance phase angle can affect the sound field in rooms and acoustic parameters applied to assess a room reverberation. In this paper, the issue was investigated theoretically using t...
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| Format: | Article |
| Language: | English |
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Institute of Fundamental Technological Research
2022-09-01
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| Series: | Archives of Acoustics |
| Subjects: | |
| Online Access: | https://journals.pan.pl/Content/124244/PDF/aoa.2022.142008.pdf |
| _version_ | 1797869254976995328 |
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| author | Mirosław Meissner Tomasz G. Zieliński |
| author_facet | Mirosław Meissner Tomasz G. Zieliński |
| author_sort | Mirosław Meissner |
| collection | DOAJ |
| description | Accurate definition of boundary conditions is of crucial importance for room acoustic predictions because the wall impedance phase angle can affect the sound field in rooms and acoustic parameters applied to assess a room reverberation. In this paper, the issue was investigated theoretically using the convolution integral and a modal representation of the room impulse response for complex-valued boundary conditions. Theoretical considerations have been accompanied with numerical simulations carried out for a rectangular room. The case of zero phase angle, which is often assumed in room acoustic simulations, was taken as a reference, and differences in the sound pressure level and decay times were determined in relation to this case. Calculation results have shown that a slight deviation of the phase angle with respect to the phase equal to zero can cause a perceptual difference in the sound pressure level. This effect was found to be due to a change in modal frequencies as a result of an increase or decrease in the phase angle. Simulations have demonstrated that surface distributions of decay times are highly irregular, while a much greater range of the early decay time compared to the reverberation time range indicates that a decay curve is nonlinear. It was also found that a difference between the decay times predicted for the complex impedance and real impedance is especially clearly audible for the largest impedance phase angles because it corresponds approximately to 4 just noticeable differences for the reverberation metrics. |
| first_indexed | 2024-04-10T00:09:43Z |
| format | Article |
| id | doaj.art-3792093cf42647be9ad29ebe8b9f7cef |
| institution | Directory Open Access Journal |
| issn | 0137-5075 2300-262X |
| language | English |
| last_indexed | 2024-04-10T00:09:43Z |
| publishDate | 2022-09-01 |
| publisher | Institute of Fundamental Technological Research |
| record_format | Article |
| series | Archives of Acoustics |
| spelling | doaj.art-3792093cf42647be9ad29ebe8b9f7cef2023-03-16T12:10:43ZengInstitute of Fundamental Technological ResearchArchives of Acoustics0137-50752300-262X2022-09-01vol. 47No 3343353https://doi.org/10.24425/aoa.2022.142008Impact of Wall Impedance Phase Angle on Indoor Sound Field and Reverberation Parameters Derived from Room Impulse ResponseMirosław Meissner0Tomasz G. Zieliński1Institute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, PolandInstitute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, PolandAccurate definition of boundary conditions is of crucial importance for room acoustic predictions because the wall impedance phase angle can affect the sound field in rooms and acoustic parameters applied to assess a room reverberation. In this paper, the issue was investigated theoretically using the convolution integral and a modal representation of the room impulse response for complex-valued boundary conditions. Theoretical considerations have been accompanied with numerical simulations carried out for a rectangular room. The case of zero phase angle, which is often assumed in room acoustic simulations, was taken as a reference, and differences in the sound pressure level and decay times were determined in relation to this case. Calculation results have shown that a slight deviation of the phase angle with respect to the phase equal to zero can cause a perceptual difference in the sound pressure level. This effect was found to be due to a change in modal frequencies as a result of an increase or decrease in the phase angle. Simulations have demonstrated that surface distributions of decay times are highly irregular, while a much greater range of the early decay time compared to the reverberation time range indicates that a decay curve is nonlinear. It was also found that a difference between the decay times predicted for the complex impedance and real impedance is especially clearly audible for the largest impedance phase angles because it corresponds approximately to 4 just noticeable differences for the reverberation metrics.https://journals.pan.pl/Content/124244/PDF/aoa.2022.142008.pdfroom acousticscomplex wall impedanceindoor sound fieldroom impulse responsereverberation parameters |
| spellingShingle | Mirosław Meissner Tomasz G. Zieliński Impact of Wall Impedance Phase Angle on Indoor Sound Field and Reverberation Parameters Derived from Room Impulse Response Archives of Acoustics room acoustics complex wall impedance indoor sound field room impulse response reverberation parameters |
| title | Impact of Wall Impedance Phase Angle on Indoor Sound Field and Reverberation Parameters Derived from Room Impulse Response |
| title_full | Impact of Wall Impedance Phase Angle on Indoor Sound Field and Reverberation Parameters Derived from Room Impulse Response |
| title_fullStr | Impact of Wall Impedance Phase Angle on Indoor Sound Field and Reverberation Parameters Derived from Room Impulse Response |
| title_full_unstemmed | Impact of Wall Impedance Phase Angle on Indoor Sound Field and Reverberation Parameters Derived from Room Impulse Response |
| title_short | Impact of Wall Impedance Phase Angle on Indoor Sound Field and Reverberation Parameters Derived from Room Impulse Response |
| title_sort | impact of wall impedance phase angle on indoor sound field and reverberation parameters derived from room impulse response |
| topic | room acoustics complex wall impedance indoor sound field room impulse response reverberation parameters |
| url | https://journals.pan.pl/Content/124244/PDF/aoa.2022.142008.pdf |
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