To enhance the performance of the filter in the digital system, the pre-emphasis filter in a digital frequency-modulating exciter which is based on FPGA is designed and realized.

为了提高数字系统中滤波器的性能，对基于FPGA的数字调频激励器中预加重滤波器进行了设计与实现。

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The emphasis is put on the design of incorporate with module fabric and filter. The experimental results reveal that this method is correct.

滤波器与组件结构的一体化设计是论述重点，实验结果验证了该方法的正确性。

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This paper laid emphasis on the designing of four-step band pass filter, and gives the details of design method and debug process.

重点介绍了四阶带通滤波器的设计方法，并给出设计思路和调试方法。

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