Reduction of electronic delay in active noise control systems - A multirate signal processing approach
Reduction of electronic delay in active noise control systems - A multirate signal processing approach
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DOI：
10.1121/1.1432980
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发表时间：
2002-02-01
影响因子：
2.4
通讯作者：
Lai, JW
中科院分区：
文献类型：
--
作者：
Bai, MR;Lin, YP;Lai, JW
电子延迟一直是有源噪声控制（ANC）系统中的一个关键问题。无论采用前馈结构还是反馈结构都是如此。特别是，过多的延迟将创建一个因果关系的问题，在前馈ANC系统的有限长度的管道，本文提出了一种多速率信号处理方法，最大限度地减少电子延迟的控制回路。在这种方法中。在离散时间信号的抽取和内插中需要数字控制器。计算效率进一步提高了多相方法，低通有限脉冲响应（FIR）滤波器的相位必须仔细设计，以避免不必要的延迟。基于H-1，H-2和H-无穷范数的频域优化程序，分别利用在FIR滤波器的设计。所提出的方法是通过使用浮点数字信号处理器实现的。实验结果表明，多速率的方法仍然有效地抑制宽带（200-600 Hz）的噪声在管道中的最小上游测量麦克风放置20厘米。(C)2002年美国声学学会。
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.