Dear David,
Thanks for your advice!
I had found out the TX audio distortion of my SM1000 is causing by the MIC
amp., which I used is a noise one. And I also found the SM1000 may be more
sensitive to the background noise than FreeDv, because FreeDv had involve the
prefilter to handle the MIC signal.Am I right? The SNR reach 22db from SM1000
to FreeDv and sync is steady. I will test it on air and report later.
Refer to 700B mode, I had read your post on Sep. 24,2015. It seems not an easy
job for me. But for the amazing performance on noise band, I will try anyway.
The step you advised are as below:
1. First step is to write a unit test to printf out the memory
usage of the cohpsk modem states.
2. Next step is a unittest that runs on a STM32F4 Discovery board to
profile the CPU load.
Right?
Thanks and Best Regards,
James Jiang
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