研究了高倍抽取的数字下变频设计，重点分析了基于级联积分梳状滤波器、级联补偿滤波器、级联根升余弦滤波器的多级抽样频率算法。
In this paper, the high decimation ratio of digital down converter is studied and the multi-stage decimation algorithm is especially analyzed based on CIC filter, CFIR filter and RRC filter.
分析了级联积分梳状（CIC）滤波器的结构，证明其可以高效地胜任抽取滤波的任务。
The structure of Cascaded Integrator Comb (CIC) filter is discussed. CIC filter can efficiently perform the task of both decimating and filtering.
分析了级联积分梳状（CIC）滤波器的结构，证明其可以高效地胜任抽取滤波的任务。
The structure of Cascaded Integrator Comb (CIC) filter is discussed. CIC filter can efficiently perform the task of both decimating and filtering.
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