Advances of Research on Speech Signal Processing Strategy
in Cochlear Implant
Nie Kaibao Lan Ning Gao Shangkai Yang Fusheng
(Department of Electrical Engineering, Tsinghua University,Beijing 100084)
Abstract Cochlear implant is a new technology to restore hearing ability to totally deaf people. First of all, this paper presents its principle and system design. Then, the advances of research on its speech signal processing strategy is reviewed in detail. Finally, on the basis of preliminary results, further promising development in cochlear implant is proposed.
Key words Cochlear implant Speech signal processing Electrical stimulation Rehabilitation
1 引 言
人工电子耳蜗(Cochlear Implant)是近年来迅速发展起来的一项聋人康复新技术,其基本原理是用微弱电流脉冲直接兴奋聋人耳蜗内的听神经,使聋人恢复听觉。人工电子耳蜗可以在某种程度上使全聋人实现语言的理解能力,特别是对全聋儿童,若在早期植入这种装置,会达到比较好的效果。
据调查,我国目前大约有2300万听力不同程度(45dB以上)受损患者[1],其中600万为全聋人,300万为聋儿。对于低度听障患者,助听器可以帮助提高听力,而对于重度听障患者(95dB以上),助听器已失去效能。在目前生物及医学技术的限制下,人工电子耳蜗是恢复全聋人听觉的一种比较有效的方法。
2 人工电子耳蜗的设计原理
2.1 工作原理