一个任意波形发生器，由键盘选择输出波形的类别，至少输出5种以上不同类别的波形， 信号频率可以由键盘输入控制。-An arbitrary waveform generator, the output waveform from the keyboard to select the category, at least 5 or more different types of output waveform, the signal frequency can be controlled by t