Plain C implementataion of the Kaldi online feature extractor using FFTW.

Produces identical output to kaldifeat and kaldi-native-fbank.

C Benchmark

See bench.cpp. Wall-clock time to compute features for 1000 second waveform, averaged over 10 runs.

Implementation	Time (Seconds)
kali-native-fbank	0.4978459
knf	0.3398971

Python Benchmark

See bench.py. Wall-clock time to compute features for 1000 second waveform:

Implementation	Time (Seconds)
kaldifeat	10.6698
kali-native-fbank	0.7778
knf	0.3258