Introduction - If you have any usage issues, please Google them yourself
C language design FIR filter,Bandpass frequency signal extracted with resistance is to limit the frequency of the signal. Sampling frequency 22050Hz, itself the passband width, general signal passband (or stop band) at 200 ~ 300Hz, the passband attenuation 1db, transition zone at 100 ~ 250Hz, stop-band attenuation of 30db.