【摘要】 在许多应用中,周期性干扰是由旋转的机械设备所产生的。 一个周期性信号可以与一个特殊形式的周期性的脉冲串完全相干。本文提出了一种采用脉冲串的自适应有源噪声抵消器(AANC)来抵消周期性干扰,这种抵消器产生一个与干扰信号相同步的周期性的单位脉冲串作为参考输入。将这种有源噪声抵消器和Delayed-X LMS算法相结合,可以大大地减小运算量,并且也可以保证良好的收敛特性。理论分析和计算机仿真验证了本文的结果。更多还原

【Abstract】 In many applications, a periodic interference is generated by a rotating machine. Now it is known that a periodic signal can be completely coherent with a special periodic pulse train. In this paper, an adaptive active noise canceller (AANC) using a pulse train is then introduced to reduce the periodic interference. The constant amplitude periodic pulse train which is synchronous with the interference signal is used as a reference input for the adaptive filter. It is shown herein that the total computational cost decreases if the AANC is combined with the Delayed-X LMS algorithm, and that excellent convergence performance can be obtained. A theoretical analysis and computer simulations validate the results.更多还原