- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - Honolulu, HI, USA (2018.7.18-2018.7.21)] 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - Evaluation of Bone Conduction Vibration System Using Photoacoustic Effect
摘要： This article proposes a novel bone conduction vibrator based on an interesting phenomenon where audible sound can be perceived when a vibration is produced using a laser beam that is synchronized to the sound and this vibration is transmitted to an auricular cartilage. To study this phenomenon, we measured the effect using a rubber sheet with similar properties to those of soft tissue, together with an acceleration sensor, and found that audible sound was produced in the sample. We also calculated the force level based on the mechanical impedance and the acceleration in the proposed system. It is expected that a force level equal to the reference equivalent threshold force level can be achieved at a light intensity below the safety limit for human skin exposure by choosing an irradiation wavelength at which a larger degree of optical absorption occurs. This novel application of the photoacoustic effect is promising for bone conduction hearing aids.
关键词： bone conduction,hearing aids,laser,vibration,photoacoustic effect
更新于2025-09-23 15:21:01
-
[IEEE 2018 IEEE 20th International Workshop on Multimedia Signal Processing (MMSP) - Vancouver, BC, Canada (2018.8.29-2018.8.31)] 2018 IEEE 20th International Workshop on Multimedia Signal Processing (MMSP) - Measuring Ear-Canal Reflectance and Estimating Ear-Canal Area Functions and Eardrum Reflectance
摘要： Ear-canal reflectance contains information about ear-canal cross-sectional area functions and eardrum reflectance. These are important in audiology and the design of modern hearing aids and headphones. This paper investigates the inversion method for jointly estimating ear-canal cross-sectional area function and eardrum reflectance, given the acoustic reflectance measured at the entrance of the ear canal. It is found through physical experiments and simulations that the estimated cross-sectional area function is spatially band-limited to 2Fc/c, where Fc is the frequency bandwidth of the low-pass filtered reflectance used in the inversion, and c is the speed of sound. If the actual spatial bandwidth of the area function under estimation is higher than this, then Gibbs ripples appear in the estimated area function. A method is presented for the accurate measurements of ear-canal reflectance, and results are presented for two subjects along with the estimated ear-canal area functions and eardrum reflectance.
关键词： Headphone and hearing aids signal processing,Gibbs phenomena,measurements of ear-canal reflectance,eardrum reflectance,inversion method,ear-canal area function
更新于2025-09-10 09:29:36