If the modulation rate is high, it is possible to smooth out the pulse train using passive electronic filters and recover an average analog wave form.
如果调制率高，是有可能顺利进行，脉冲列车使用被动电子过滤器和收回平均模拟波形。
Analog filters can be divided into active filters and passive filters.
模拟滤波器可分为有源滤波器和无源滤波器。
In view of harmonic which generated from the new-type HVDC analog system 12-pulse wave rectifiers and the inverter, designed passive filters system based on the new-type converter transformer.
针对新型高压直流输电模拟系统12脉波整流器与逆变器产生的谐波，设计了基于新型换流变压器的无源滤波器系统。
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