数字信号处理的课后编程作业，要求是实现FFT变换，信号的卷积，还有数字滤波器的设计。前两个是VB编写的可执行文件，后面一个是VC的源程序，希望对大家有用 -Digital signal processing of after-school programming operations, the requirements for achieving FFT transform, the convolution signal, as well as digital filter design.