| Summary: | 碩士 === 中原大學 === 電機工程研究所 === 106 === This thesis presents the developments of Active Noise Control (ANC) system for reducing the noise from centrifugal fans and axial fans. By integrating several loudspeakers and microphones, using digital signal processer (DSP) to realize the single channel feedback ANC and multiple channel feedback ANC structure with Finite Impulse Response (FIR) filter and Filtered-X Least Mean Square (FXLMS) algorithm, the ANC system for fans is created. To prove that there is feasibility in real products with fan and to solve the realistic fan noise problems, this thesis also presents the system integrated in real cooling fan and breathing machine. Real-time experimental results show that the proposed systems not only reduces the narrowband noise of fans but also achieves global cancellation. Then, in the end of this thesis, the method to optimize the error signal of feedback ANC system using adaptive predictor which can remain the stability of feedback ANC system with disturbance is proposed.
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