The high-pass filter and low-pass filter are active filters. Trap circuit is used to filter the frequency interference.
高通滤波器和低通滤波器均采用有源滤波器,并采用陷波器对50Hz的工频干扰进行专门的滤除。
参考来源 - 脉搏波测试实验教学仪的设计·2,447,543篇论文数据，部分数据来源于NoteExpress
It is shown that the realized active filters by use of these circuits have respectively good results.
用这些电路所实现的有源滤波器都具有较好的效果。
This paper presents the performance analysis of a hybrid filter composed of a passive and active filters connected in series.
对由无源滤波器和有源滤波器串联而成的混合型滤波器的性能进行了分析。
Moreover, three-phase four-wire active filters can suppress zero line current, and solve symmetric problem of system effectively.
另外，三相四线制有源电力滤波器能有效地抑制零线电流，并能有效地解决系统的不对称问题。
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