介绍各种滤波器的C语言实现，有FIR的低通、高通、带通、带阻等，卡尔曼滤波器-C language describes the various filters, FIR low pass, high pass, band pass, band stop, the Kalman filter

C语言实现设计的FIR滤波器,带通提取该频率信号，带阻是限制该频率信号。采样频率22050Hz，自己确定通带宽度，一般信号通带（或阻带）在200～300Hz，通带内衰减1db，过渡带在100～250Hz，阻带内衰减30db。-C language design FIR filter,Bandpass frequency signal extracted with resistance is to limit the frequency of the signal. Sampling freque

带通提取该频率信号，带阻是限制该频率信号。采样频率22050Hz，自己确定通带宽度，一般信号通带（或阻带）在200～300Hz，通带内衰减1db，过渡带在100～250Hz，阻带内衰减30db。-Bandpass frequency signal extracted with resistance is to limit the frequency of the signal. Sampling frequency 22050Hz, itself the passband width, gene

用C语言实现matlab的butter函数中低通和带通功能,高通和带阻没写,有兴趣的可以自己加入.(Using C language to achieve matlab butter function low-pass and band-pass function, high pass and band stop did not write)