New Hearing Aid System Relieving Old Age People from Hearing Loss toward the Future Ubiquitous Society

这个项目是由福井大学工程研究生院和医学研究生院通过校际合作完成的，各学校从专业的角度分享了该项目的学术活动。由于助听器老年人的迅速增加，开发易于操作和低成本的助听器变得重要。听力损失在对数频率轴上呈单调增加的趋势。本课题提出了一种在对数频率轴上通过对频率轴进行扭曲(压缩和展开)即可实现控制的余弦型助听器电路，并通过电路安装和主观测试验证了该电路能够有效地补偿听力损失。本课题还研究了通过将脑诱发电位信号反馈给受试者…在短时间内实现助听器电路自动控制的可能性本课题在上述助听器基础研究的基础上，对气导音和骨导音的优选率进行了评估，找出了具有一定发生概率的最优率，从而验证了骨导音的有效性及其在玻璃小型化助听器系统中的可能应用。对助听器电路的数字化进行了研究，最终实现了以DSP-LSI为元件的全数字助听器电路，并利用一阶全通网络横向连接实现了频率轴的扭曲，实现了对给定听力损失模式的方便易用的助听器功能。该项目还提出了通过无线局域网功能直接连接多个助听器用户组成网络化助听器系统来提高老龄社会的通信质量，并设计了一个基于蓝牙功能的基于无线局域网的助听器系统。此外，针对未来泛在社会提出了另一种基于无线局域网的助听器系统，通过扩展的思想使用了ZigBee元件，并经验验证了它可以将传输时延和功耗降低到基于蓝牙功能的网络助听器系统的十分之一，并可以容纳系统中助听器用户的数量从蓝牙型系统的6个用户扩展到应用程序租用听力损失疗养院所需的ZigBee类型系统的大约10,000个用户。较少

This project was performed by the investigators through interschool collaboration between Graduate School of Engineering and Graduate School of Medical Science of University of Fukui Each school shared the academic activities For the project from the specialty viewpoint.It becomes important due to the prompt increment of old age people with hearing keg to develop easy handling and low cost hearing aids. The hearing loss has a trend of monotonically increasing at higher frequencies on the logarithmic frequency axis. This project proposed a cosine type hearing aid circuit which can be easily controlled on the logarithmic frequency axis by warp (compress and expand) the frequency axis, and empirically verified by circuit installation and subjective test that it could efficiently compensate for the hearing loss, This project also studied the possibility of automatic control of hearing aid circuits in a short fitting time by feeding the cerebral evoked potential signal back to the hearing a … More id circuit, detected the correlation between the signal and input tone and it proved that a drastic improvement of measuring accuracy would be required Regarding the use of bone-conducted sounds, this project evaluated the preferable rate of air-conducted and bone-conducted sounds and found the most preferable rate with some occurrence probability through subjective test so that it verified the effectiveness of bone-conducted sounds and possible application to glass-type miniaturized hearing aid systems.This project is based on the above mentioned fundamental research of hearing aid, studied to digitalize the hearing aid circuits and finally implemented a full-digital hearing aid circuit with a DSP-LSI element and warped the frequency axis by using first-order all pass networks in transversal connection, and realized the easily handled hearing aid function to given hearing loss patterns. It verified the hearing loss compensation with much better quality of hearing in a real environment.This project also proposed the improvement of communications quality in an old age society by directly connecting many hearing aid users via wireless LAN functions to make up a networked hearing aid system, and designed a wireless LAN based hearing aid system using Bluetooth functions. Furthermore, it proposed another wireless LAN based hearing aid system for the future ubiquitous society, using ZigBee elements by extending the idea and empirically verified that it would reduce both transmission delay and power consumption down to the one over tenth of those of Bluetooth function based networked hearing aid system and it would accommodate extend the number of hearing aid users in a system from 6 users in the Bluetooth type system upto about 10,000 users in the ZigBee type system required for the application hire a hearing loss fist nursing home. Less