Title: Reduction of electronic delay in active noise control systems - A multirate signal processing approach
Authors: Bai, MR
Lin, YP
Lai, JW
機械工程學系
Department of Mechanical Engineering
Issue Date: 1-Feb-2002
Abstract: Electronic delay has been a critical problem in active noise control (ANC) systems. This is true whether a feedforward structure or a feedback structure is adopted. In particular, excessive delays would create a causality problem in a feedforward ANC system of a finite-length duct, This paper suggests a multirate signal-processing approach for minimizing the electronic delay in the control loop. In this approach. digital controllers are required in decimation and interpolation of discrete-time signals. The computation efficiency is further enhanced by a polyphase method, where the phases of low-pass finite impulse response (FIR) filters must be carefully designed to avoid unnecessary delays. Frequency domain optimization procedures based on H-1, H-2, and H-infinity norms, respectively, are utilized in the FIR filter design. The proposed method was implemented by using a floating-point digital signal processor. Experimental results showed that the multirate approach remains effective for suppressing a broadband (200-600 Hz) noise in a duct with a minimum upstream measurement microphone placement of 20 cm. (C) 2002 Acoustical Society of America.
URI: http://dx.doi.org/10.1121/1.1432980
http://hdl.handle.net/11536/29049
ISSN: 0001-4966
DOI: 10.1121/1.1432980
Journal: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
Volume: 111
Issue: 2
Begin Page: 916
End Page: 924
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