4x4矩阵键盘程序，实现无阻塞扫描程序含仿真电路-4x4 matrix keyboard program to achieve non-blocking scanner with simulation circuit

在DSP5509A开发环境下，进行运用阻塞矩阵方法进行语音信号增强处理。-In the DSP5509A development environment, the speech signal enhancement processing is carried out by using the block matrix method.