The effect of modal localization on reverberant energy decay in a case of two acoustically coupled rooms
In the paper a modal analysis was used to describe a reverberation phenomenon in an irregularly shaped room. A theoretical model was limited to low sound frequencies, when eigenmodes are lightly damped, thus they may be approximated by normal acoustic modes of a hard-walled room. A utility of thi...
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| Format: | Article |
| Language: | English |
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Institute of Fundamental Technological Research Polish Academy of Sciences
2014-01-01
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| Series: | Archives of Acoustics |
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| Online Access: | https://acoustics.ippt.pan.pl/index.php/aa/article/view/1349 |
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| author | Mirosław Meissner |
| author_facet | Mirosław Meissner |
| author_sort | Mirosław Meissner |
| collection | DOAJ |
| description | In the paper a modal analysis was used to describe a reverberation phenomenon in an
irregularly shaped room. A theoretical model was limited to low sound frequencies, when
eigenmodes are lightly damped, thus they may be approximated by normal acoustic modes
of a hard-walled room. A utility of this method was demonstrated in a numerical example
where the room in a form of two acoustically coupled rectangular subrooms was considered.
A reverberation time was evaluated individually for each subroom from time decay of acoustic
pressure amplitude for different distributions of absorbing materials of room walls and various
positions of sound source under the condition that a total room absorption remained constant.
Calculation results have shown a great influence of modes localization on a reverberant energy
decay for a large difference between the absorption coefficients of walls in subrooms, because
in this case for frequencies of some localized modes a substantial increase in the reverberation
time was observed. |
| format | Article |
| id | doaj-art-ff8bb18ca0e64eb885535b4b1ff49624 |
| institution | DOAJ |
| issn | 0137-5075 2300-262X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Institute of Fundamental Technological Research Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Acoustics |
| spelling | doaj-art-ff8bb18ca0e64eb885535b4b1ff496242025-08-20T03:11:51ZengInstitute of Fundamental Technological Research Polish Academy of SciencesArchives of Acoustics0137-50752300-262X2014-01-01314(S)The effect of modal localization on reverberant energy decay in a case of two acoustically coupled roomsMirosław Meissner0Institute of Fundamental Technological Research, Polish Academy of Sciences, Świętokrzyska 21, 00-049 WarszawaIn the paper a modal analysis was used to describe a reverberation phenomenon in an irregularly shaped room. A theoretical model was limited to low sound frequencies, when eigenmodes are lightly damped, thus they may be approximated by normal acoustic modes of a hard-walled room. A utility of this method was demonstrated in a numerical example where the room in a form of two acoustically coupled rectangular subrooms was considered. A reverberation time was evaluated individually for each subroom from time decay of acoustic pressure amplitude for different distributions of absorbing materials of room walls and various positions of sound source under the condition that a total room absorption remained constant. Calculation results have shown a great influence of modes localization on a reverberant energy decay for a large difference between the absorption coefficients of walls in subrooms, because in this case for frequencies of some localized modes a substantial increase in the reverberation time was observed.https://acoustics.ippt.pan.pl/index.php/aa/article/view/1349room acousticsmodal analysisreverberation timemodes localization. |
| spellingShingle | Mirosław Meissner The effect of modal localization on reverberant energy decay in a case of two acoustically coupled rooms Archives of Acoustics room acoustics modal analysis reverberation time modes localization. |
| title | The effect of modal localization on reverberant energy decay in a case of two acoustically coupled rooms |
| title_full | The effect of modal localization on reverberant energy decay in a case of two acoustically coupled rooms |
| title_fullStr | The effect of modal localization on reverberant energy decay in a case of two acoustically coupled rooms |
| title_full_unstemmed | The effect of modal localization on reverberant energy decay in a case of two acoustically coupled rooms |
| title_short | The effect of modal localization on reverberant energy decay in a case of two acoustically coupled rooms |
| title_sort | effect of modal localization on reverberant energy decay in a case of two acoustically coupled rooms |
| topic | room acoustics modal analysis reverberation time modes localization. |
| url | https://acoustics.ippt.pan.pl/index.php/aa/article/view/1349 |
| work_keys_str_mv | AT mirosławmeissner theeffectofmodallocalizationonreverberantenergydecayinacaseoftwoacousticallycoupledrooms AT mirosławmeissner effectofmodallocalizationonreverberantenergydecayinacaseoftwoacousticallycoupledrooms |