3-D Sound Image Reproduction Method Based on Spherical Harmonic Expansion for 22.2 Multichannel Audio
In this paper, we propose a three-dimensional (3-D) sound image reproduction method based on spherical harmonic (SH) expansion for 22.2 multichannel audio. 22.2 multichannel audio is a 3-D sound field reproduction system that has been developed for ultra-high definition television (UHDTV). This syst...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-02-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/4/1994 |
| _version_ | 1827657365270298624 |
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| author | Kenta Iwai Hiromu Suzuki Takanobu Nishiura |
| author_facet | Kenta Iwai Hiromu Suzuki Takanobu Nishiura |
| author_sort | Kenta Iwai |
| collection | DOAJ |
| description | In this paper, we propose a three-dimensional (3-D) sound image reproduction method based on spherical harmonic (SH) expansion for 22.2 multichannel audio. 22.2 multichannel audio is a 3-D sound field reproduction system that has been developed for ultra-high definition television (UHDTV). This system can reproduce 3-D sound images by simultaneously driving 22 loudspeakers and two sub-woofers. To control the 3-D sound image, vector base amplitude panning (VBAP) is conventionally used. VBAP can control the direction of 3-D sound image by weighting the input signal and emitting it from three loudspeakers. However, VBAP cannot control the distance of the 3-D sound image because it calculates the weight by only considering the image’s direction. To solve this problem, we propose a novel 3-D sound image reconstruction method based on SH expansion. The proposed method can control both the direction and distance of the 3-D sound image by controlling the sound directivity on the basis of spherical harmonics (SHs) and mode matching. The directivity of the 3-D sound image is obtained in the SH domain. In addition, the distance of the 3-D sound image is represented by the mode strength. The signal obtained by the proposed method is then emitted from loudspeakers and the 3-D sound image can be reproduced accurately with consideration of not only the direction but also the distance. A number of experimental results show that the proposed method can control both the direction and distance of 3-D sound images. |
| first_indexed | 2024-03-09T22:42:10Z |
| format | Article |
| id | doaj.art-fddc8efdd9414728add2535c9f64bd6d |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T22:42:10Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-fddc8efdd9414728add2535c9f64bd6d2023-11-23T18:37:31ZengMDPI AGApplied Sciences2076-34172022-02-01124199410.3390/app120419943-D Sound Image Reproduction Method Based on Spherical Harmonic Expansion for 22.2 Multichannel AudioKenta Iwai0Hiromu Suzuki1Takanobu Nishiura2College of Information Science and Engineering, Ritsumeikan University, Kusatsu 525-8577, JapanCollege of Information Science and Engineering, Ritsumeikan University, Kusatsu 525-8577, JapanCollege of Information Science and Engineering, Ritsumeikan University, Kusatsu 525-8577, JapanIn this paper, we propose a three-dimensional (3-D) sound image reproduction method based on spherical harmonic (SH) expansion for 22.2 multichannel audio. 22.2 multichannel audio is a 3-D sound field reproduction system that has been developed for ultra-high definition television (UHDTV). This system can reproduce 3-D sound images by simultaneously driving 22 loudspeakers and two sub-woofers. To control the 3-D sound image, vector base amplitude panning (VBAP) is conventionally used. VBAP can control the direction of 3-D sound image by weighting the input signal and emitting it from three loudspeakers. However, VBAP cannot control the distance of the 3-D sound image because it calculates the weight by only considering the image’s direction. To solve this problem, we propose a novel 3-D sound image reconstruction method based on SH expansion. The proposed method can control both the direction and distance of the 3-D sound image by controlling the sound directivity on the basis of spherical harmonics (SHs) and mode matching. The directivity of the 3-D sound image is obtained in the SH domain. In addition, the distance of the 3-D sound image is represented by the mode strength. The signal obtained by the proposed method is then emitted from loudspeakers and the 3-D sound image can be reproduced accurately with consideration of not only the direction but also the distance. A number of experimental results show that the proposed method can control both the direction and distance of 3-D sound images.https://www.mdpi.com/2076-3417/12/4/199422.2 multichannel audiospherical harmonic expansion3-D sound image reproductionmode matching |
| spellingShingle | Kenta Iwai Hiromu Suzuki Takanobu Nishiura 3-D Sound Image Reproduction Method Based on Spherical Harmonic Expansion for 22.2 Multichannel Audio Applied Sciences 22.2 multichannel audio spherical harmonic expansion 3-D sound image reproduction mode matching |
| title | 3-D Sound Image Reproduction Method Based on Spherical Harmonic Expansion for 22.2 Multichannel Audio |
| title_full | 3-D Sound Image Reproduction Method Based on Spherical Harmonic Expansion for 22.2 Multichannel Audio |
| title_fullStr | 3-D Sound Image Reproduction Method Based on Spherical Harmonic Expansion for 22.2 Multichannel Audio |
| title_full_unstemmed | 3-D Sound Image Reproduction Method Based on Spherical Harmonic Expansion for 22.2 Multichannel Audio |
| title_short | 3-D Sound Image Reproduction Method Based on Spherical Harmonic Expansion for 22.2 Multichannel Audio |
| title_sort | 3 d sound image reproduction method based on spherical harmonic expansion for 22 2 multichannel audio |
| topic | 22.2 multichannel audio spherical harmonic expansion 3-D sound image reproduction mode matching |
| url | https://www.mdpi.com/2076-3417/12/4/1994 |
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