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TECHNICAL PAPERS

Multi-Channel Adaptive Feedforward Control of Noise in an Acoustic Duct

[+] Author and Article Information
E. Esmailzadeh

Department of Engineering and Applied Science, University of Ontario, Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario, Canada L1H 7K4

A. R. Ohadi

Department of Automotive Engineering, Iran University of Science & Technology, Tehran, Iran

A. Alasty

Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran

J. Dyn. Sys., Meas., Control 126(2), 406-415 (Aug 05, 2004) (10 pages) doi:10.1115/1.1636772 History: Received October 04, 2000; Revised May 05, 2003; Online August 05, 2004

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References

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Figures

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Schematic diagram of a finite-length duct
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Feed forward ANC system with acoustic feedback neutralization
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Acoustic finite-length duct with five secondary sources and five error microphones
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Block diagram of the single-reference/Multiple-output feed forward ANC system in a modeled duct
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Frequency response function of the secondary path between the secondary source s5 and the error microphone e3 (a) Magnitude, (b) Phase
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Illustrative Example 1, Input 5—Sound pressure spectra at the error microphone point e5; Effect of the secondary source location on the behavior of the SISO FXLMS ANC system; Dash dot (-.): Without ANC system, Dashed (--): Secondary source s2, Solid (-): Secondary source s3, Dotted (..): Secondary source s5
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Illustrative Example 1, Input 5—Sound pressure spectra at point e5-Effect of the error microphone location on the behavior of the SISO FXLMS ANC system, Secondary source placed at point s5; Dash dot (-.): Without ANC system, Dashed (--): Error microphone e2, Solid (-): Error microphone e3, Dotted (..): Error microphone e5.
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Illustrative Example 1, Input 2—Sound pressure spectra at the error microphone point e1; Dash dot (-.): Without ANC system, Dashed (--): SISO FXLMS (s5-e1), Solid (-): MEFXLMS algorithm, Dotted (..): Minimax algorithm
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Illustrative Example 1, Input 2—Sound pressure spectra at the error microphone point e3; Dash dot (-.): Without ANC system, Dashed (--): SISO FXLMS (s5-e3), Solid (-): MEFXLMS algorithm, Dotted (..): Minimax algorithm
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Illustrative Example 5, Input 5—Sound pressure spectra resulted from the MEFXLMS algorithm at the error microphone point e5; effect of feedback neutralization technique. Dash dot (-.-): without ANC system; solid (-): with feedback neutralization; dotted (..): without feedback neutralization
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Illustrative Example 2—Sweep sine input-sound pressure response at the error microphone point e5. (a) Without ANC system, (b) SISO ANC system (s5-e5), (c) multi-channel ANC system with Mimimax algorithm

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