2022 Fiscal Year Final Research Report
Low-cost acoustic indoor positioning method for smartphones using installed speakers
| Project/Area Number |
20K23313
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
1001:Information science, computer engineering, and related fields
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2020-09-11 – 2023-03-31
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| Keywords | 屋内測位 / 音響測位 / 識別 / 非可聴音 |
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| Outline of Final Research Achievements |
We proposed a 3D localization method using a single speaker and a single microphone. Our proposed method estimates the direction of the microphone based on the knowledge that the spectral amplitude of a speaker in each direction is different. The distance between the speaker and microphone is estimated based on the received amplitude value. The 3D location of the microphone is calculated from the estimated azimuth, elevation, and distance values. We conducted real-environment experiments at multiple locations and confirmed that the 90-percentile localization error was 0.48 m.
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| Free Research Field |
測位
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| Academic Significance and Societal Importance of the Research Achievements |
本研究により，放送用のボックススピーカが放射方向毎で非対称かつ特有な周波数特性を持つことが明らかとなった．これは，従来困難と考えられていた単一のスピーカによるモノラルマイクロフォンの測位を可能とする重要な発見であるといえる．またこれにより，音声放送を目的として屋内環境へ設置されているスピーカでモノラルマイクロフォンの測位が可能となることから，音響信号を用いた屋内測位技術の普及につながるものと考えている．
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