这是 一个界面 内完成 数字信号发生器、电子琴、电话机按键、信号合成的代码，基于MATLAB，相比 多界面 的有自己的特色，请参考！-This is a complete digital signal generator interface, keyboard, telephone keypad, the code signal synthesis, based on MATLAB, more than the interface has its own characteristics, ple