多级抽样:又叫多阶段抽样,在很多情况下,特别是复杂的、大规模的市场调查中,调查单位一般不是一次性直接抽取到的,而是采取两阶段或多阶段抽取的办法,即先抽取大的单元,在大单元中再选取小单元,再在小单元中选取更小的单元,这种抽样方式称为多级抽样。多级抽样可以把上述各抽样方法的优势互补,因此大规模现况研究多采用此方法。
现以软件无线电的基本知识为基础,分析了单级和多级抽样频率转换,并进行了比较。
On the basis of the soft radio, this paper analyzes the sampling frequency transform for single series and the series, and compares them.
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.
方法通过多级随机抽样抽取济南市4所初中550名初一学生,采用问卷调查。
Methods A total of 550 students in 4 junior schools were sampled with multistage sampling and surveyed.
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