Thanks Gullik, all useful feedback. I intend to spend some of 2015 testing and tuning FreeDV and will hopefully address some of these issues. Also planned are a more robust HF mode and a VHF mode, as well as the SM1000 and we will see continued integration into many other SDR projects via the FreeDV API.
List: I still have an urgent need for some one to help me with C coding. Otherwise things will still happen eventually but more slowly. Lots of great ideas and suggestions but only a couple of us doing all the work ....... Cheers, David On 29/12/14 07:03, Gullik Webjörn wrote: > Having followed the development of codec2 and freedv, I have attempted > to test out the technology, with varying success. I have had a few > really nice QSOs > with 100% copy both ways, but also numerous failiures. A few notes below: > > - What does the "S-meter" actually show? I have had some QSOs that were > very good > at down to 5 ( dB SNR ? ) and I have also seen some where SNR has been > 10-12 or so > but with marginal voice decode 20-30%. Pilot SNR or average of all > carriers or what? > > - I have had to upgrade my computer when implementing 0.95.4 Beta, the > previous machine > running an early version of freedv did that quite well, on a 1.6 Ghz > machine with 128 M ram. > > (part of the problem might be upgrading from Ubuntu 12.04 to current ) > > - Is it not possible to detect rate / # of carriers on receive and > *automagicaly* switch between > 1600 / 1600W / 1400 V.91 mode? It seems doable? > > - I assume TX adjustment is the hardest part of setting up a station. > Frequently I have been heard > but been unable to decode the other party. Some sort of "reverse beacon" > would no doubt help people > adjust transmit to maximize decoding reliability. > > - Some voices and modulation level "fit well" with codec2, some do not. > My first DV QSO was with > F6EMT on 20 m, and that was with excellent voice, a really enjoyable > conversation. > We recently had an "aniversary", when I found Marc on same QRG, but with > upgraded software and mode > on both ends. 100% copy, vy nice. > > - I have frequently used a websdr ( links at websdr.org ) to "see" what > my signals look like, and determine > if I can be heard. A freedv mode in the websdr software would be fantastic. > > - Would it be possible to add "tougher" FEC / Parity check on the TEXT > info, it would be nice to get > rid of "random" characters interspersed in a message, and possibly alos > some way to LOG the info. > > Ramblings, > > SM6FBD / Gullik > > > ------------------------------------------------------------------------------ > Dive into the World of Parallel Programming! The Go Parallel Website, > sponsored by Intel and developed in partnership with Slashdot Media, is your > hub for all things parallel software development, from weekly thought > leadership blogs to news, videos, case studies, tutorials and more. Take a > look and join the conversation now. http://goparallel.sourceforge.net > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > ------------------------------------------------------------------------------ Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
