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Signal Processing Design for Cochlear Implant System Using Piezoelectric Sensor

Signal Processing Design for Cochlear Implant System Using Piezoelectric Sensor
Alternative Title
압전센서를 사용한 인공와우시스템 신호처리설계
Cho, Jae Wook
DGIST Authors
Cho, Jae WookChoi, Ji WoongCho, Hui Sup
Choi, Ji Woong
Cho, Hui Sup
Issued Date
Awarded Date
2014. 2
cochlear implantpiezoelectric sensorsignal processingsmall sizelow power consumption인공와우압전센서신호처리소형저전력
Today, the cochlear implant system is the most successful auditory prosthesis for the patients suffering hair cell loss or damage. The current cochlear implant system consists of an implantable electrode array for the stimulation and an external signal processor includ-ing a microphone and a battery. However, the conventional cochlear implant system is composed of a heavy signal processor. Furthermore, the exposure of an external signal processor causes a cosmetic problem to the patients. Therefore, the cochlear implant sys-tem is required to reduce size and power consumption.
In the thesis, to realize the implementation of an entirely implantable cochlear sys-tem, the signal processing system is studied when a piezoelectric sensor is employed. When a mechanical stress is applied, the piezoelectric sensor produces an electrical charge. The acoustic sounds picked up by the piezoelectric sensor are amplified and transmitted to the microprocessor. The microprocessor used the CC430F6137. This system is a multi-channel system and applied the continuous interleaved sampling (CIS) algorithm to make a charge-balanced biphasic pulse. Also, this system is referred to as miniaturized system comprised of sensing, processing, and actuating functions which are combined on-to a single board. Building a complete printed circuit board (PCB) involves hardware (H/W) and software (S/W) design. The proposed signal processing system embedded with PCB has been tested and verified for future animal experiment. ⓒ 2014 DGIST
Table Of Contents
Ⅰ. Introduction 1
Ⅱ. Backgrounds 3
2.1 Auditory System 3
2.2 Hearing Loss 6
2.3 History of Cochlear Implant Systems 8
Ⅲ. Cochlear Implant System 10
3.1 Typical Cochlear Implant System 11
3.1.1 Microphone & Signal Processor 11
3.1.2 Transmission Link 12
3.1.3 Electrode Array 13
3.2 Biphasic Pulse 13
3.2.1 Continuous Interleaved Sampling Algorithm 14
3.3 Entirely Implantable Cochlear System 16
3.3.1 Piezoelectric Sensor 17
3.3.2 Proposed System 19
Ⅳ. System Implementation 20
4.1 Block Diagram 20
4.2 MATLAB Simulation 21
4.3 System Development 23
4.3.1 Component Selection 24
4.3.2 Hardware Design 26
4.3.3 Software Design 30
4.4 Result of Printed Circuit Board (PCB) 31
4.5 Experiment of Signal Processing Board 32
Ⅴ. Conclusion & Future Work 34
Ⅵ. References 35
Korean Abstract 38
Acknowledgement 40
Information and Communication Engineering
Related Researcher
  • 최지웅 Choi, Ji-Woong 전기전자컴퓨터공학과
  • Research Interests Communication System; Signal Processing; Communication Circuit Design; 생체 신호 통신 및 신호 처리; 뇌-기계 인터페이스(BMI); 차세대 교차계층 통신 및 신호 처리; 5G 모바일 통신
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Appears in Collections:
Department of Electrical Engineering and Computer Science Theses Master


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