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TECHNICAL PAPERS

Broadband Spatially Feedforward Active Noise Control Algorithms Using a Comb Filter

[+] Author and Article Information
Mingsian R. Bai, Jienwen Lai

Department of Mechanical Engineering, National Chiao-Tung University, 1001 Ta-Hsueh Rd., Hsin-Chu 300, Taiwan, Republic of China

J. Vib. Acoust 125(1), 18-23 (Jan 06, 2003) (6 pages) doi:10.1115/1.1525003 History: Received April 01, 2001; Revised August 01, 2002; Online January 06, 2003
Copyright © 2003 by ASME
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References

Figures

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The spatially feedforward structure of ANC system (a) the schematic duct ANC system (b) equivalent circuit
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Block diagram of the fixed spatially feedforward controller composed of a nonrecursive FIR and a recursive comb filter
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Curve-fit for the peak values of the impulse response of the spatially feedforward controller using the least-square method
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Block diagram of the adaptive spatially feedforward algorithm
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The experimental setup of a spatially feedforward ANC system
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The fixed spatially feedforward controller (a) comparison of the impulse responses between the ideal spatially feedforward controller and the comb filter controller. Ideal controller (—), comb filter controller (----) (b) Experimental result in Sound Pressure Level (SPL) of control performance obtained using the fixed spatially feedforward controller. Control off (—), control on (⋅⋅⋅).
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Design of the adaptive comb filter controller (a) The frequency response of the comb filter. Ideal controller (—), comb filter (⋅⋅⋅) (b) The frequency response of the FIR filter.
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The experimental results in Sound Pressure Level (SPL) of control performance obtained using adaptive spatially feedforward algorithms (a) FXLMS algorithm; (b) NFXLMS algorithm. Control off (—), control on (⋅⋅⋅).

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