研究課題/領域番号 |
17K00260
|
研究機関 | 富山県立大学 |
研究代表者 |
|
研究期間 (年度) |
2017-04-01 – 2021-03-31
|
キーワード | Acoustic Resonance / Computer Simulation / FDTD / Pinna Geometry / Spatial Hearing |
研究実績の概要 |
First, my HRTF-PCA paper was accepted and published in the open-access journal Scientific Reports on 2019/5/16. I am grateful to KAKENHI for providing this opportunity to improve my acoustics simulator so that the necessary multi-subject data could be calculated, and for defraying the journal publication cost. Second, as planned, I implemented a modified calculation of the air-skin boundary condition in my simulation program. However, comparing the sensitivity results between the Acoustic-Radiation-Pressure (ARP) method and the Direct-Perturbation (DP) method with a cylindrical concha model revealed only slight (essentially no) differences. Thus, while a good match between the ARP and DP methods was obtained, the ARP-equation coefficient still had to be set to a value of about 3.
|
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 third year was less than desired, because despite a major effort to improve the calculation of air-skin boundary in the FDTD simulation program, an inexplicable factor of about 3 is still necessary. In fact, more detailed investigations revealed that the optimum value for the coefficient was 2.7 in order to obtain a close match between acoustic sensitivity results from the DP and ARP methods. As the ARP method is hundreds of times more efficient than the DP method for acoustic sensitivity analysis, the necessity for this non-unity factor is intriguing and deserves further investigation. However, as this issue was not a major part of the initial research plan, it can be said that the initial plan has been delayed.
|
今後の研究の推進方策 |
As a result of the unexpected outcome described above, I requested a one year extension to this project and accordingly modified the initial plans. During the 2020 fiscal year, I am planning to conduct the research along two main lines: (i) test the modified boundary conditions using human pinna geometry data, which is more realistic and has more detailed curved surfaces compared with the simplified cylindrical concha model tested so far; and (ii) whether the factor 2.7 persists or not, attempt to carry out sensitivity analyses on HRTF peaks and/or notches, as far as my available computing resources allow.
|
次年度使用額が生じた理由 |
In 2019 FY, the only expenditure was for the journal publication (216323 Yen). Therefore, a total 740018 Yen remains, to be carried over to 2020 FY. I originally planned to use this for international conference travel. However in the current COVID-19 era, international travel may not be desirable. Instead, this remaining amount may be used for a 2nd PC-workstation to help run the simulation program simultaneously under various analysis conditions, especially if the more costly DP method must be used. Depending on research progress, a domestic conference later in 2020 FY may also be included.
|