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论述了一种以有用信号的频率变化规律控制滤波电路的频率特性来选择有用信号，抑制干扰的技术，文中给出了应用系统的原理框图，并较为详细地介绍了其中数控滤波器的设计与应用，还给出了有关的实验结果。
In this paper, a technique of controlling the frequency characteristics of the filter circuit by the frequency variation of the useful signal to select the useful signal and restrain the interference is presented. The block diagram of the application system is given in this paper. The design of the filter and its design are described in detail Application, also gives the relevant experimental results.