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利用窗函数法设计FIR滤波器，给出其抽样响应。
Using window function design FIR filter, given in response to its sample.
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设计：分层抽样，随机分组对照，量效分析。
DESIGN: Grade sampling, randomized controlled quantitative analysis.
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设计：简单随机抽样调查。
DESIGN: a simple random sampling survey.
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设计：简单随机抽样调查。
DESIGN: a simple random sampling survey.
youdao