| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 91 ===
Recent years, ANC headsets with analog controllers have become popular products. But the analog controller must be designed according to different headsets for specific tasks, and the order of the analog controller is usually too high to realize. In the thesis, digital adaptive controllers are realized and adopted for the developed ANC headset. The design architecture can be applied in commercialized headsets for noise-cancellation purpose.
In the study, three control structures, i.e., the feedforward, feedback, and hybrid ones with the FXLMS algorithm, are investigated to design the controller based on a DSP broad. The performance and characteristics of noise-cancellation using different ANC structures are compared. The hybrid structure superior to the others is highlighted. Then, an auditory canal model is built up to evaluate the result of noise reduction in human hearing. Considering the actual difference between the error microphone of the headset and human eardrum, the virtual microphone technique is applied. Besides, the influences of the order of the estimated paths as well as the sampling rate on the ANC system are investigated.
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