数字滤波器的C语言实现，低通，高通，带通，带阻，等等等等等。-Digital filter in the C language implementation.

数字滤波器的C语言实现，包括高通、低通、带通滤波器（ Digital filter C language, including high pass, low pass, band pass filter ）(Digital filter C language, including high pass, low pass, band pass filter)