A Basic Study on a Micro Sensor/Actuator with Equivalent Structure of Human Basilar Membrane

在这个项目中，我们的目标是开发一种具有鱼骨结构的微型传感器/执行器，这是一种相当于人体基底膜的系统。我们的具体目标是a)用于语音识别的智能麦克风，b)具有自适应频率特性的助听器。本课题的成果总结如下：1。作为智能传声器鱼骨结构的优化设计，我们推导出了“完美对数线性结构”：1)谐振器的阻性元件保持恒定，2)电感、电容元件在对数线性上排列。一种新的声学信号特征提取方法的提出我们构建了一种从鱼骨输出信号中提取AM/FM/pitch分量的理论。利用住友金属工业的某工艺，设计并制作了鱼骨结构，并通过实验验证了鱼骨结构的特性。鱼骨传感器的应用利用鱼骨传感器，我们实现了1)一种用于微型助听器的具有可控频率特性的声传感器，2)一种具有仿生结构的声源定位传感器。

In this project, we aim to develop a micro sensor/actuator with fishbone structure, which is a equivalent system of the human basilar membrane. Our specific targets are a) intelligence microphone for speech recognition, b) hearing aids with adaptive frequency charateristics.The summary of the results of this project is as follows:1. Derivation of an optimum fishbone structure as an intelligence microphoneAs an optimal design of fishbone, we derived "perfect log-linear structure" , in which1) resistive elements of resonators are constant,2) inductive, capacitive elements are arrayd on a log-linear.2. Proposition of a new feature extraction for acoustic signalsWe constructed a theory to extract AM/FM/pitch componets from output signals of fishbone.3. Implementation of fishbone by Si micro-machiningBy a process in Sumitomo Metal Industries, we designed and fabricated fishbone structure and confirmed its characteristics by experimets.4. Applications of fishbone sensorsWith using fishbone sensors, we realized1) an acoustic sensor with controllable frequency characteristics for micro hearing aids,2) a sound source localization sensor with bio-mimicry structure.