Hi Adrian, My variant supports multiple bit rates by parameter selection, 1733 is used for FreeDV 2020. But either version is fine - they're based on the same core developed by Jean-Marc. Both still have problems with about 10% of voices I have tested.
Yes I've known for some time the theoretical lower bit rate is around 50 bit/s, but that's without being able to recognize the individual and very low quality, long latency, and no robustness to bit errors. Think speech to text and back to speech. Cheers, David On 09/09/19 00:17, Adrian Musceac wrote: > Hi David, > > Thanks for the kind words! > I had looked at LPCNet before, but on the Mozilla repo when J.M. Valin > made the announcements on xiph.org <http://xiph.org>. > Does your variant of LPCNet only support the 1733 bit/s rate? The > Mozilla one is 1600 bits/s which makes it a bit easier for me to use as > I don't have to adjust the frame header parameters. I'm a bit wary of > neural networks as it seems their performance highly depends on the > quality and amount of training data while Codec2 does not. > I have read an article recently claiming that the median amount of > information transferred with human voice is about 39 bits/s. This seems > off by an order of magnitude to me, but if they are right it means a lot > of improvement can still be made on the vocoders. > > Best regards, > Adrian > > On Sun, Sep 8, 2019 at 12:27 AM David Rowe <[email protected] > <mailto:[email protected]>> wrote: > > Look great Adrian, well done! I quite enjoy using gqrx for several work > and play projects, so that's a fine starting point. > > You might also consider a LPCNet codec mode. > > Cheers, > David > > On 08/09/19 04:04, Adrian Musceac wrote: > > Hi, > > I made a clone of Gqrx with transmit support for digital and analog > > voice, video and IP data. > > You can see it in action here: > https://www.youtube.com/watch?v=9bxorlma7QU > > What I'd like to know is if people are interesting in transmitting and > > receiving FreeDV with SDR hardware. I'm looking at adding such a > feature. > > Relevant code is in the next branch of > > https://github.com/kantooon/qradiolink > > > > Many thanks to Alex Csete and Moe Wheatley for making the code used to > > build this open source. > > > > Best, > > Adrian > > > > > > > > > > _______________________________________________ > > Freetel-codec2 mailing list > > [email protected] > <mailto:[email protected]> > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > <mailto:[email protected]> > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > > > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
