推出巴特沃斯低通滤波器1的姊妹篇2.本文详细阐述了巴特沃斯低通滤波器的实现原理，并给出了c语言完整的实现代码-Butterworth low-pass filter introduced a companion 2. This paper describes the realization of the principle Butterworth low-pass filter, and gives the complete implementation of the c language code