--window-type=hamming # disable Dans window, use the standard
  --use-energy=false    # only fbank outputs
  --sample-frequency=8000 # Cantonese is sampled at 8kHz
  
  --low-freq=64         # typical setup from Frantisek Grezl
  --high-freq=3800
  --dither=1
  
  --num-mel-bins=15     # 8kHz so we use 15 bins
  --htk-compat=true     # try to make it compatible with HTK