计算机的应用，特别是在自动化领域中，常常采用微型计算机进行实时控制和数据处理。当用微型计算机构成一个数据采集系统或过程控制系统时，所要采集的外部信号或被控对象的参数往往是一些在时间和数值上都是连续变化的模拟量，如温度、压力、流量、速度、位移等。-Computer applications, especially in the automation field, often using the computer for real-time control and data processing. When used to form a micro-computer data acquisition system or process control system, the external signal to be collected or charged with a number of parameters of an object is often both in time and numerical simulation of continuous changes in volume, such as temperature, pressure, flow, speed and displacement.