Abstract
Three feedforward active noise control algorithms based on H 2, H ∞, and modified H 2optimal model matching principles are investigated in this study. The first two methods provide significant attenuation for broadband random noises. However, the H 2and H ∞methods generally result in high-gain controllers at high frequencies, which calls for some truncation measures in the frequency domain. The third method effectively eliminates the high-gain problem of the ordinary H 2and H ∞algorithms. In addition, this method is guaranteed to result in a causal and stable controller which is crucial in practical implementation. The algorithms are coded into controllers by using a floating-point digital signal processor. The experimental results show significant attenuation for stationary broadband random noises as well as transient impact noises in a duct.
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