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引言——什么是数字系统我们生活中所遇到的物理变量,大部分属于连续变量,如时间、温度、距离和重量等等。但是在会话、数据处理、观察量的记录以及大多数其他的人类活动中,并不能使用这些连续变量的准确值,而必须用一些数字量近似地来代表它们的实际值。例如测量室温为28℃而实际室温可能为28℃与29℃之间的某一值。
Introduction - What is a digital system Most of the physical variables we encounter in our lives are continuous variables such as time, temperature, distance, weight, and so on. However, the exact values of these continuous variables can not be used in conversations, data processing, recording of observations, and most other human activities. Instead, their numerical values must be used to approximate their actual values. For example, the measured room temperature is 28 ° C and the actual room temperature may be a value between 28 ° C and 29 ° C.