中文说明：这个例子展示了如何应用自适应滤波器通过有源噪声来衰减噪声控制。控制二次传播路径是抗噪声从输出扬声器到安静区内的错误麦克风的路径。以下命令生成一个扬声器到麦克风的脉冲响应，其频带限制在160范围内
English Description：
This example shows how to apply adaptive filters to the attenuation of acoustic noise via active noise control.The secondary propagation path is the path the anti-noise takes from the output loudspeaker to the error microphone within the quiet zone. The following commands generate a loudspeaker-to-error microphone impulse response that is bandlimited to the range 160