The root cause of this is that before the constantly changing analog signals from thermocouples or resistance thermometers can be processed digitally , an analog - to - digital conversion process is necessary , often resulting in loss of overall accuracy and measurable time delays 它的起因是可能经常从热电偶或抵抗温度计改变的模拟信号,而需要处理数字信号,一个数模转换过程是必要的,经常造成全面准确性和测量时间延误的损失。
Steps must be taken to set up digital cable tv network , digital live satellite tv system , digital terrestrial tv system and digital broadcasting system , in a bid to realize the analog - to - digital conversion of the broadcasting system to provide digital tv and related value - added services 建立数字有线电视网、数字卫星直播电视系统、数字地面电视系统、数字广播系统,实现广播电视系统从模拟向数字的技术转变,提供数字电视及其增值服务。
For the purpose of testing the function of extended ports , digital - to - analog conversion and analog - to - digital conversion , an auxiliary experiment board is made , it includes analog signal outputs , switch signal outputs , led circuit , eight - segment nixie tubes and a digital - to - analog conversion circuit 为了验证扩展口、 a d转换和d a功能,还自己制作一个包括8路模拟量输入、开关量输入、 8路led 、 4个数码管和d a转换电路辅助电路板。
The basic elements of a control system using a digital computer consist of the data - gathering devices which perform analog - to - digital conversion on data form the system which is to be controlled ; the digital computer itself , which performs calculations on the data supplied and makes the necessary decisions ; and the means of communication with , or control over , certain of the elements in the external environment 由在数据上执行模拟数字的转化的设备形成将被控制的系统的集合数据使用一台数字的计算机的一个控制系统的基本的元素组成;数字的计算机自己,在供应的数据上它执行计算并且做必需的决定;并且通讯的工具与,或控制上,肯定在外部的环境的元素的。