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 |
Appears in Collections: | Articles |
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