第二部分系统地研究了基于FPGA的数字滤波器实现技术。
In the second part, the implementation of digital filters in FPGA is studied systematacially.
本文提出采用AD和DSP软件编程的方法实现信号的混频功能，作为AD和数字滤波器实现频率变换的一个典型应用。
In the paper, we advanced the method of mixing function by means of AD and DSP software programming, which is a typical application of frequency transformation with AD and digital filter.
根据数字滤波器实现模式和虚拟仪器的特点首次提出了虚拟滤波器的概念，即一种现场设置、设计、生成和作用的数字滤波器。
According to the physical models of the digital filter and the feature of a virtual instrument, the new concept of the virtual filter is brought forward firstly in this paper.
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