Hi Matt,
Alternatively, could someone confirm to me that the API integration
recipe is the same for 700D as it is for 1600? The API itself seems
pretty simple, so I'm wondering if I'm missing some kind of subtle magic
handshake that is particular to 700D.
It's the same API.
700D is more sensitive to sound card issues like dropped samples, I had
to do quite a bit of work to support the variety of Windows machine out
there, e.g. large FIFO buffers to stop samples being dropped.
700D is also more sensitive to frequency offset, but if it's not passing
through a HF radio yet that won't be a problem.
Suggest you try a unit test like freedv_tx 700D with test frames piping
through your sound card. Try that between two laptops first, then a
laptop and RPi. Just pipe it using sox play/record first, then
gradually integrate your code. Many examples in README_ofdm.txt
If that works build up slowly from there. The freedv_rx -v option dumps
states info like sync and frequency offset which might help.
Listening to the signal is useful, odd sounds compared to the x86
version are a sign of trouble.
Feel free to send me a sample file and I'll take a look at it.
Cheers,
David
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