该滤波器在基频处的幅值无衰减，相位无延时，能将2次以上的谐波全部滤掉。
The filter has no fundamental frequency decay and phase delay, and all harmonics above2nd order are filtered.
其好处是减少了的相位延时，从而减低了扬声器的相位失真，改良了扬声器的瞬态响应。
Its benefits is to reduce the phase delay, thus reducing the phase distortion speaker, improved transient response of the speaker.
如果相位与频率的变化关系是线性的，那么滤波器仅仅会使信号延时一个常数量。
If the phase and frequency changes in the relationship is linear, then the filter would signal delay is only a constant number.
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