编制一个参数在线可调的波形发生程序，由D／A 输出，构成参数在线可调的波形发生器，并用示波器观察波形。

（1）函数波形可选f(t)=asin(bt)，其中a、ｂ参数在线可调（亦可自己选择，但要求至少2个参数可调且调节很明显）；

（2）参数调节采用如下两种方式之一：两个可调电位器输出通过A／D 转换后作为可调参数、参数通过实验系统上的键盘实时修改

-The preparation of an argument online adjustable waveform generation program, by the D/A output form online waveform generator with adjustable parameters, and observed with an oscilloscope waveform. (1) The function waveform optional f (t) = asin (bt), where a, b adjustable parameters online (also their choice, but requires at least two adjustable parameters and adjustment obviously)　(2) adjusting parameters using one of the following two ways: two adjustable potentiometer output by the A/D converter as an adjustable parameter, the parameters through the keyboard on the experimental system real-time modifications