fm_demod - a diagnostic tool for the codec2 library to create an audio file from
fm_demod usage: InputFMRawFile OutputSpeechRawFile
Given an input raw file (44.4 kHz, 16 bit shorts) with a FM signal centered 11.1
kHz, outputs a file of demodulated audio samples.
The first argument, InputFMRawFile is the file name of a file with FM
signal samples. If "-" is given the input is taken from stdin.
The second argument, OutputSpeechRawFile is the file name
of a file to be created with audio data. If "-" is given the
output is sent to stdout.