| Project/Area Number |
22K17904
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 61010:Perceptual information processing-related
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| Research Institution | Chiba University |
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Principal Investigator |
IRWANSYAH 千葉大学, フロンティア医工学センター, 特任助教 (60929818)
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| Project Period (FY) |
2022-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2023: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2022: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | Bone Conduction / Crosstalk / Bone Transducer / Cancellation / Binaural Hearing / Silicone Pinna / Cartilage Conduction / bone conduction / crosstalk / binaural hearing / bone transducer / cancellation |
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| Outline of Research at the Start |
A bone-conduction (BC) sound presented on either side of the head reaches the cochlea in both ears. This “crosstalk” phenomenon is considered one factor limiting the ability to understand the surroundings better with two ears when using a pair of BC hearing devices. This project proposes an implementation of the “crosstalk cancellation” method on the human head as a solution to suppress BC “crosstalk” sounds. In this study, psychoacoustic tests will be carried out to confirm the effectiveness of the proposed crosstalk cancellation system.
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| Outline of Annual Research Achievements |
In bone conduction (BC) hearing, there is a problem known as "crosstalk." This occurs when sound vibrations directed to one ear are perceived by the other ear, which potentially interferes with binaural hearing. Our project aims to address this issue by canceling these crosstalk vibrations. In the fiscal year 2023, we thus concentrated on the following items::
(1) Crosstalk Cancellation at an Accelerometer on the Mastoid: We evaluated crosstalk through subjective hearing threshold tests. Our results indicate that a reduction in vibrations behind the pinna (mastoid) could result in a decrease in crosstalk at the cochlea.
(2) Manual Tuning of Phase and Level of Pure Tones: Building on the approach proposed in (1), designed to cancel crosstalk at the accelerometer, we developed an enhanced method. After the initial approach (1) was applied, the level and phase of the crosstalk cancellation filter had to be manually adjusted by the subjects through a lateralization task. This fine-tuning of the filter resulted in successful crosstalk cancellation at the cochlea.
(3) Ballistic Dummy Head Study: We also conducted a crosstalk cancellation experiment on a ballistic dummy head with synthetic skin and bone in order to compare with the results from the human subjects.
(4) Silicone Pinna Model: We expanded our study by creating a silicone pinna model. This model facilitates the investigation of BC sounds transferring from the vibrator attached to the pinna to the accelerometer.
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