Two sharp attenuation poles can be located close to either side of the desired pass-band to improve the frequency selectivity.
两个衰减极点分别产生在靠近通带的两边，提高了通带频率的选择性。
Two sharp attenuation poles can be located close to either side of the desired pass-band to improve the frequency selectivity.
两个衰减极点分别产生在靠近通带的两边，提高了通带频率的选择性。
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