--window-type=hamming # disable Dans window, use the standard
  --sample-frequency=8000
  
  --low-freq=64         # typical setup from Frantisek Grezl
  --high-freq=3800
  --dither=1
  
  --num-mel-bins=36     # 8kHz so we use 36 bins (@ 8 filters/octave to get closer to 40 filters/16Khz used by IBM)