| 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 |
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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 | Hearing / Bone Conduction / Crosstalk / Cancellation / Bone Transducer / 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 Final Research Achievements |
Crosstalk in bone conduction (BC) hearing devices presents a challenge by transmitting sound to the unintended ear, affecting binaural hearing benefits such as sound localization. Our research tackles this by developing a method to cancel crosstalk at an accelerometer on the mastoid via an adaptive FxLMS algorithm to generate an anti-crosstalk signal, aiming for the cancellation effect to extend to the cochlea. Despite mastoid cancellation, testing with pure-tone hearing thresholds indicated successful crosstalk reduction, as participants experienced lower thresholds in noise, suggesting effective cancellation. We further advanced our solution by implementing it in real-time, demonstrating practical applicability. Additionally, we explored combining this with lateralization tasks to refine crosstalk cancellation directly at the cochlea, aiming for a more targeted and effective approach. This series of innovations marks a significant step forward in improving BC hearing devices.
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| Academic Significance and Societal Importance of the Research Achievements |
Our research demonstrates the potential to reduce crosstalk in bone conduction (BC) devices, a crucial step towards improved binaural hearing. While not yet fully realized, it shows promise for enhancing binaural perception in future BC device applications.
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