As a kind of digital circuit based on digital circuit, digital circuit used is "0" and "1", so the digital circuit is relatively simple, only "0" and "1" these two Numbers, and other signals are made by "0" and "1". We all know that a variety of physical phenomena in the world are simulated, the analog signals in real life is not easy to control, in addition, signals emitted from different objects is also different, if the analog signal is used to deal with, will seem more dififcult. The scientists put the analog signal capture, adoption of a certain method to convert analog signal into digital signal. Is converted into digital signals is very convenient to modify its use, bring convenience to human life. Analog signal to digital signal conversion is need some logic circuit design, analog signal is the actual signal, the digital signal is a series of points, ifnd the key to analog signal ifnally connect these points, it can be concluded that the digital signal, digital signal compared with analog signals, accurate but not analog signals within a certain range of difference between the real signal is not big, can think of is emitted by an object the actual signal.%因为数字电路是以数字为基础的一种电路，数字电路所用到的数字是“0”和“1”，所以采用数字电路较为简单，只有“0”和“1”这两个数字，其它的信号都是由“0”和“1”组合而成的。我们都知道世界上各种物理现象都是模拟的，这种模拟信号在实际生活中不易控制，另外，不同的物体所发出的信号也是不一样的，如果采用模拟信号来处理，就会显得较为困难。科学家们把模拟信号捕获到，采用一定的手段把模拟信号转化为数字信号。转化成的数字信号就很方便对其修改利用，为人类生活带来方便。模拟信号到数字信号的转化是需要一定的逻辑电路设计的，模拟信号是生活中实际的信号，而数字信号则是找到模拟信号关键的一系列点，最后把这些点连接起来，就可以得出数字信号，数字信号与模拟信号相比较，没有模拟信号准确但在一定的范围内与真实的信号相差不大，可以认为就是实际物体所发出的信号。
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