Now it is known that a periodic signal can be completely coherent with a special periodic pulse train. 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。
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. 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。