Moving out, we call the filter function.
向外移，我们会调用filter函数。
Another handy feature you can apply here is the Filter function.
此处还有一个很方便的功能可以使用，即Filter功能。
The function preg_grep can also filter a list quickly.
函数preg_grep还可以快速地过滤列表。
Using window function design FIR filter, given in response to its sample.
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.
利用窗函数法设计FIR滤波器，给出其抽样响应。
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