通过这个设备，你能够学到最古老的运行的信号之一的抽样时间是如何做到的以及它是如何工作的。
With this device, you can learn how one of the oldest operating signals of sample time is made and how it works.
为在计算机上做傅里叶级数的分解，需要对连续信号进行抽样，然后按离散傅里叶级数进行分解。
In order to analyzing digital signals with the aid of computers, it is necessary to use Fourier Series of discrete form.
从信号中去除高频信息，降低抽样频率而不导致频谱混叠的过程称之为抽取。
Filtering the high frequency part of the signal and reducing the sampling frequency, which does not produce the aliasing, is called sampling.
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