Thanks for the kind feedback David.
The noise analysis was a real eye-opener for me. Even if my dB numbers
turned out to be off by a bit, the comparison to the analog signal in
identical noise helped me "visualize" the performance improvement.
You make a good point about the nonlinearities of SSB transmission.
Even well-adjusted SSB signals tend to be compressed/companded to help
the SNR at the receiver. I may take a look at doing some companding
tests to see how much it changes the perception of the analog version...
it might even rate its own columns in the tables. The challenge with
adjusting a compander is that a "proper" adjustment is often in the ear
of the beholder.
I see now why AWGN is a popular baseline. Trying to model a real radio
channel is... complicated.
I'm certainly interested if anybody has feedback on how to improve
either article. The RasPi build article will get updated soon --
somebody just emailed me when they tried to build on a platform where he
needed more prerequisite packages than what I listed. So I'll check the
build machines I used here to verify the package names then update it.
I'm also trying to figure out the best way to work in an alternative
build sequence for people who want to build codec2 as a dynamic lib, and
then link FreeDV against it.
If anybody gets really curious about the details of the noise
comparison, I'll find a way to get it all in a ZIP file so it can be
downloaded. It's mostly a matter of rounding up the right dependencies
so it can build on anybody's machine, and not just mine. ;)
73 Everybody...
Matt
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