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A modified H-2 feedforward active control system for suppressing broadband random and transient noises

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Figure 1. System block diagram of the feedforward ANC problem. P(z), S(z), and C(z) are the discrete-time transfer functions of the primary acoustic path, the secondary path, and the controller, respectively.
Figure 2. Experimental setup of the ANC system for a duct.
Figure 3. Comparison between the measured and the regenerated freqency response functions
Figure 4. The magnitudes of the controller frequency responses obtained from the feedforward ANC methods
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