抽样信号也被称为抽样函数或Sa(t)函数，是指sint与t之比构成的函数。其定义为：
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得出结论：只有抽样信号最低抽样率大于两倍信号带宽时，才能保证信号的无失真恢复。
The conclusion is that only when the minimum sample rate is more than the double of the band of the signal, can the signal been resumed without distortion.
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.
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