2023 Fiscal Year Annual Research Report
"Two Ears Are Better Than One": Towards the Development of a Real-Time Crosstalk Cancellation System Based on Bone Conduction
| Project/Area Number |
22K17904
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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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| Keywords | Bone Conduction / Crosstalk / Bone Transducer / Cancellation / Binaural Hearing / Silicone Pinna / Cartilage Conduction |
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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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