./calculate_snr -f 20 -w 30 -s 8000 -n 2 -nt 0.20 -st 0.90 -i tmp/data/sw2001.raw
number of energy [6308] does not equal total number of frames [12615]
snr for channel 0: 36.022926 dB
snr for channel 1: 30.418713 dB