§4.1应用微型机的信号发生器在控制工程或实验室工作中经常用到各种信号发生器,用来测定某一控制装置或系统的特性。为适应这一要求,已经研制了各种信号发生器。但是,用硬件实现的这些装置有以下不足之处: 1.一种仪器只能产生一种或几种波形,通用性不够。 2.比较难于产生任意频谱或波形的信号。应用微型计算机则可以比较灵活地通过更改程序来产生所要求的信号。对于任意的波形,只要把它转换成一个时间序列,也能很容易地实现。 4.1 Signal Generators Using Microcomputers Various signal generators are often used in control engineering or laboratory work to determine the characteristics of a control unit or system. In order to meet this requirement, various signal generators have been developed. However, these devices implemented in hardware have the following deficiencies: 1. An instrument can generate only one or several waveforms and is not universal enough. 2. More difficult to produce any spectrum or waveform signal. The use of microcomputers gives you the flexibility to generate the required signals by changing the program. For any waveform, simply convert it to a time series can be easily achieved.