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首页> 外文会议>International Congress on Sound and Vibration >THE z-DOMAIN ADAPTIVE MODELING OF FINITE-LENGTH ACOUSTIC WAVEGUIDE FED BY THE LOUDSPEAKER (WITH APPLICATION ON ACTIVE NOISE CONTROL)
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THE z-DOMAIN ADAPTIVE MODELING OF FINITE-LENGTH ACOUSTIC WAVEGUIDE FED BY THE LOUDSPEAKER (WITH APPLICATION ON ACTIVE NOISE CONTROL)

机译：扬声器供给有限长度声波导的Z域自适应建模（具有在主动噪声控制上的应用）

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摘要

The finite length acoustic waveguide was opened on one end, and on the other end a loudspeaker is mounted. Inside the waveguide, a microphone is axially mounted. The loudspeaker is excited with low-pass filtered white noise. The low-pass filter was 20th order Buttherworth-type, sampling frequency was 8 kHz and cut-off frequency was 1.5 kHz, below the first cut-off mode of the duct. Sampled microphone signal was used as the desired signal, and low-pass filtered white noise signal was reference (training) signal for adaptive lest mean square (LMS) modeling of the whole system. The obtained finite-impulse-response (FIR) transfer function is compared with continuous time frequency response and impulse response of the whole system. Modeling error and influence of the modeling conditions are discussed. The similar complex systems, consisted of acoustic and electromechanical parts are secondary and feedback transfer functions in active noise control. The application of some control approaches with estimated transfer functions are discussed.
机译：在一端打开有限长度的声学波导，在另一端安装扬声器。在波导内部，麦克风轴向安装。扬声器很兴奋，低通滤波的白噪声。低通滤波器是第20阶Buttherworth型，采样频率为8 kHz，截止频率为1.5 kHz，低于管道的第一个截止模式。采样麦克风信号用作期望的信号，并且低通滤波的白噪声信号是整个系统的自适应卑鄙均方（LMS）建模的参考（训练）信号。将获得的有限脉冲响应（FIR）传递函数与整个系统的连续时间响应和脉冲响应进行比较。讨论了建模误差和建模条件的影响。类似的复杂系统，由声学和机电部件组成是在有源噪声控制中的次级和反馈传递函数。讨论了一些具有估计传递函数的控制方法。

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