If you are going to use 2400B then you will have to peruse the source code,
as it is mostly experimental.
I think the sampling rate must be 48000. That is, if you do a:
freedv_tx 2400B ../raw/hts1a.raw /tmp/modem.raw
Then modem.raw will be a PCM raw file that should be sampled at 48000.
Same thing if you record off the air from the soundcard.
For example, using sox, you can:
sox -r 48000 -t raw -b 16 -e signed-integer -c 1 /tmp/modem.raw -t raw -
Then pipe that to the receiver:
| freedv_rx 2400B - /tmp/demod.raw
Now demod.raw will be sampled at 8000 as it is the PCM audio from codec2.
I didn't look to see what codec it uses. Maybe 1300 ??
I don't know what --codecrx does. I left it off and it seems to work.
Appears to be undocumented.
73/k5okc
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