Implementation of An Active Noise Reduction System
碩士 === 淡江大學 === 航空太空工程學系碩士班 === 98 === The goal of this study is to propose a new method of the implementation of Active Noise Control. People usually use Least Mean Square algorithm (LMS), Finite Impulse Response filter (FIR), or Infinite Impulse Response filter (IIR) as controlling means to reduce...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2010
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| Online Access: | http://ndltd.ncl.edu.tw/handle/91899455080866006118 |
| Summary: | 碩士 === 淡江大學 === 航空太空工程學系碩士班 === 98 === The goal of this study is to propose a new method of the implementation of Active Noise Control. People usually use Least Mean Square algorithm (LMS), Finite Impulse Response filter (FIR), or Infinite Impulse Response filter (IIR) as controlling means to reduce the wide band noise. In this study, it is targeting at low frequency, narrow band and continuous humming noise. The main procedures applied in the controller include using Fast Fourier Transformation to find out the dominant frequency of noise and using Cross Correlation to adjust the phase lag of the output sound signal according to the incoming one. The signal with opposite phase relative to the source of the noise is output to drive the anti-sound speaker. Waves from the speaker can then cancel out and then minimize the noise.
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