| 研究課題/領域番号 |
17K00260
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| 研究機関 | 富山県立大学 |
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研究代表者 |
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| 研究期間 (年度) |
2017-04-01 – 2022-03-31
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| キーワード | Acoustic Resonance / Computer Simulation / FDTD / Pinna Geometry / Spatial Hearing |
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| 研究実績の概要 |
During the 2020 fiscal year, I began to calculate HRTF peak and notch sensitivity maps of a real human outer-ear, using my FDTD acoustic simulator. However, difficulties related to the Covid-19 pandemic unfortunately prevented any further research progress, so I am extremely grateful for one more year's extension. In preparation for that, and as the original plans for international conference travel will not be carried out under Covid-19, a large part of the remaining budget was used to purchase a mobile workstation; this will allow continued research despite any restrictions on travel or work location. A C-programming environment was set up on the new workstation (Windows10), so that both simulation and data analysis/visualization (in Matlab) can be done smoothly on the same computer.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
4: 遅れている
理由
Progress in the 2020 fiscal year (1st extension year) was much less than desired, because of Covid-related and technical reasons. The currently ongoing Covid-19 situation significantly affected all work commitments and therefore reduced severely the amount of my effort on this Kaken project. Another problem was on the technical side: while my C-language simulation program runs fine on the workstation purchased at the start of this project (running under Linux CentOS), I experienced increasing difficulties running Matlab on this computer due to certain incompatibilities. This problem caused a break between the acoustic-simulation and data-analysis tasks. As mentioned above, the newly purchased Windows10 mobile workstation is able to smoothly support both simulation and analysis.
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| 今後の研究の推進方策 |
In fiscal year 2021, I plan the following two main tasks:
(i) evaluate last year's modified boundary-conditions using a human ear shape. Compared with the simplified concha model tested previously, the complicated curved shape of the human ear should help to better understand the effectiveness (or shortcomings) of the method.
(ii) using a human ear shape, calculate acoustic sensitivity maps for HRTF peaks and notches (focus on the first notch), regarding both frequency and amplitude (notch depth). Then, use these maps to modify either the shape or the reflectance of the air-skin boundary at high sensitivity regions, and thereby quantify the effects of such modifications on notch frequency and depth.
I hope to present results at the forthcoming ASJ conferences in late 2021 and early 2022.
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| 次年度使用額が生じた理由 |
As planned last year, instead of funding travel to international conferences which is undesirable or impossible in the Covid-19 era, I used a major part of the remaining budget to purchase a mobile workstation with large memory, which is being used for both simulation runs and data analysis. Therefore, a total of 69,018 Yen remains to be transferred to the 2021 fiscal year, which I plan to use mainly for conference registration and publication fees.
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