The Theoretical Study and Implementation of Active Narrow-Band Noise Control in Space
Date Issued
2004
Date
2004
Author(s)
Wu, Chiang-Kai
DOI
zh-TW
Abstract
The purpose of this paper is to compare the performances of three LMS algorithms (Rescaling, Clipping and Leaky algorithm) for adaptive active noise control at a single space location. The comparisons were conducted by numerical simulations and real-time experiments. An iteration scheme is used to calculate the weighting vector of the FIR (Finite Impulse Response) filter which is used in this control process.
Numerical simulation shows that all three algorithms are good in control process except that the clipping LMS might produce noise of higher frequency due to the convergence characteristics of the weighting vector. In case of pure tone or narrow-band noise, the real-time experimental result shows that about 15 dB noise reduction can be achieved when Rescaling or Leaky LMS algorithm is used. When the real-time test is conducted inside a running automobile in order to reduce the noise level at some location of the compartment, the performances of the control is not in satisfaction. It might be because that the noise is not stationary or the CPU speed of the computer is not fast enough.
Subjects
最小均方法
噪音主動控制
clipping algorithm
Leaky LMS algorithm
Active Noise Control
rescaling algorithm
Type
thesis
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