An Active Noise Control of Earmuff-Type Headphones by Genetic Algorithms

• Main Authors: Yu-sian Tu, 涂羽賢
• Other Authors: Shiaw-wu Chen
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/02898726989465384463

碩士 === 逢甲大學 === 自動控制工程所 === 96 === A anti-noise earphone is designed in this thesis. By using active circuit, it can generate a reverse acoustic to reduced low-frequency noise. Inner structure for this earphone contains microphone, loudspeaker and control circuit posed by the feedback system. By using dynamic analysis instrument to proceed system identification, it can obtain the system frequency response before controller design. The design of controllers is not easy to do because open-loop system is a very high-order and non-minimum phase systems. Therefore, we search for suitable controller by using genetic algorithms. The controller is simulated and analyzed by dSPACE / ControlDesk DS1103 real-time simulation system. By simulation and experimental results, we find a lower-order controller which can reduce the cost of anti-noise headphones.