中文摘要：

数字双频陷波滤波器主要用于消除或抑制数字信号中的2个频率分量。首先推导出增益可控单频陷波滤波器的设计公式；然后采用特定的幅度响应控制策略，通过级联2个单频陷波滤波器，实现了数字双频陷波滤波器的优化设计；最后对所提设计方法的有效性和实用性进行了一系列的仿真实验验证。

英文摘要：

Digital dual-frequency notch filter is mainly used to remove or restrain the sinusoidal interferences with two frequencies contained in a digital signal. Firstly, the design method of the gain controlled filter with one notch fre- quency is presented in the paper. Secondly, using the special magnitude response control strategy and cascading two notch filters, the optimal design of the digital dual-frequency notch filter is realized. Finally, the practicability and ef- fectiveness of the proposed design approach are verified by a series of simulation experiments.