Is it possible to have the SuperpoweredFrequencyDomain obj apply a windowing function (Hamming for example) on time-domain data before doing the FFT? Patrick Vlaskovits October 16, 2017 19:43 Follow It does apply windowing, Hanning-Z. Related articles I used the functions createWAV, fwrite and closeWAV, and they could to save files in app data directory but not in the sdcard. Why is that? We currently fetch audio from iPhone’s in-build microphone and on it we have to apply FFT filtering. Comments 0 comments Article is closed for comments.