What I read into this PDF was, if one looks at a few Codec2 "packets", one can deduce where the speech is going ie. transitioning from one sound to another. One syllable to another. Having "learned" this to recreate what the original words were, better.
I've been trying to "get my head around" Codec2 encoding, explaining to others: One's voice starts with one's vocal chords which give a pulsating air stream, this being the basic pitch and amplitude. Then, mouth, nose and throat filter this waveform. Then, some wind noise is added. So rather than trying to reproduce the waveform, digitise and send the components. Is this an adequate description? Alan VK2ZIW On Mon, 23 Apr 2018 14:34:24 +0930, David Rowe wrote > I don't think they are on this list, but I have had a response via > email so free free to reach out to them. > > Their current algorithm needs a GPU to decode, so won't run on a > SM1000 > (or even CPU) class machine. This sort of computational complexity > is common for new DSP algorithms. The tend to get more efficient > over time. > > - David > > On 23/04/18 13:46, Akshay Mishra wrote: > > Are the authors available on this list -- I read the paper and if some > > trial is available would like to play with this on our setup (similar to > > SM1000 but with a different RF front end). A training set for each user > > can be incorporated when they first state and made available to all... > > > > thanks, > > > > On 22 April 2018 at 01:32, David Rowe <da...@rowetel.com > > <mailto:da...@rowetel.com>> wrote: > > > > Some amazing work with Codec 2 and WavNet ... using a Codec 2 > > encoder and WaveNet decoder they have speech quality as good as AMB > > wideband at just 2400 bit/s > > > > http://www.rowetel.com/?p=5966 > > > > - David > > > > On 20/04/18 11:41, David Rowe wrote: > > > > Hi Bruce, > > > > I'll be presenting at our WIA national conference on the same > > dates .. will send you the slides. Aiming to release on FreeDV > > GUI by then. > > > > - David > > > > On 20/04/18 11:35, Bruce Perens wrote: > > > > Woo hoo! Please tell me about anything you'd like me to > > present at Hamvention. This will definitely be in there. > > > > On Thu, Apr 19, 2018 at 6:51 PM, David Rowe > > <da...@rowetel.com <mailto:da...@rowetel.com> > > <mailto:da...@rowetel.com <mailto:da...@rowetel.com>>> wrote: > > > > Hello, > > > > I've been working steadily on FreeDV 700D, porting from > > Octave to C, > > and working through some tricky sync problems. I can > > now simulate > > the end-end system on the command line, and listen to > > the results. It's outperforming FreeDV 1600 by about > > 10dB on fast fading > > channels, and is error free at -2dB SNR on AWGN channels. > > > > The main differences from FreeDV 700C are a new OFDM > > modem with rate > > 1/2 LDPC code and the option of a long interleaver > > (seconds of > > latency). It uses the the 700 bit/s codec, although > > with a few > > tweaks we could run other codecs and LDPC codes using a > > few dB more > > SNR. More inf on the FreeDV 700D mode here: > > > > https://www.rowetel.com/?p=5573 > > <https://www.rowetel.com/?p=5573> > > <https://www.rowetel.com/?p=5573 > > <https://www.rowetel.com/?p=5573>> > > > > For anyone who would like to play along, here's > > README_ofdm.txt for > > the mode: > > > > https://svn.code.sf.net/p/freetel/code/codec2- dev/README_ofdm.txt > > <https://svn.code.sf.net/p/freetel/code/codec2- dev/README_ofdm.txt> > > > > <https://svn.code.sf.net/p/freetel/code/codec2- dev/README_ofdm.txt > > <https://svn.code.sf.net/p/freetel/code/codec2- dev/README_ofdm.txt>> > > > > This includes references to blog posts, lots of command > > line > > examples, and specification at the end. There's enough > > information > > for the super keen to run it over the air using the cmd > > line tools, > > which I haven't done yet. > > > > Next steps are some over the air tests, write a > > freedv_api.c "mode" > > for it, integration into the FreeDV GUI program, and > > lots of tweaking. > > > > - David > > > > On 16/04/18 08:52, Glen English wrote: > > > > I will write more abt this when I return, however > > a) the quality > > of the capacitor influences notch depth, b ) > > getting the area > > and proximity of the loop to the line matters. for > > a 6" filter, > > anything over 33db for 600k bp-reject is very good. > > > > > > > > > > -------------------------------------------------------------- ---------------- > > > > Check out the vibrant tech community on one of the > > world's most > > engaging tech sites, Slashdot.org! > > http://sdm.link/slashdot > > > > > > > > _______________________________________________ > > Freetel-codec2 mailing list > > Freetel-codec2@lists.sourceforge.net > > <mailto:Freetel-codec2@lists.sourceforge.net> > > <mailto:Freetel-codec2@lists.sourceforge.net > > <mailto:Freetel-codec2@lists.sourceforge.net>> > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > <https://lists.sourceforge.net/lists/listinfo/freetel-codec2> > > > > <https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > <https://lists.sourceforge.net/lists/listinfo/freetel-codec2>> > > > > > > -- You received this message because you are > > subscribed to the Google > > Groups "digitalvoice" group. > > To unsubscribe from this group and stop receiving > > emails from it, > > send an email to > > digitalvoice+unsubscr...@googlegroups.com > > <mailto:digitalvoice%2bunsubscr...@googlegroups.com> > > <mailto:digitalvoice%2bunsubscr...@googlegroups.com > > <mailto:digitalvoice%252bunsubscr...@googlegroups.com>>. > > To post to this group, send email to > > digitalvo...@googlegroups.com > > <mailto:digitalvo...@googlegroups.com> > > <mailto:digitalvo...@googlegroups.com > > <mailto:digitalvo...@googlegroups.com>>. > > Visit this group at > > https://groups.google.com/group/digitalvoice > > <https://groups.google.com/group/digitalvoice> > > <https://groups.google.com/group/digitalvoice > > <https://groups.google.com/group/digitalvoice>>. > > For more options, visit > > https://groups.google.com/d/optout > > <https://groups.google.com/d/optout> > > <https://groups.google.com/d/optout > > <https://groups.google.com/d/optout>>. > > > > > > > > > > -- > > Bruce Perens K6BP - Standards committee chair, license > > review committee member, Open Source Initiative > > President, Open Research Institute > > > > > > -------------------------------------------------------------- ---------------- > > > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > > > > > > _______________________________________________ > > Freetel-codec2 mailing list > > Freetel-codec2@lists.sourceforge.net > > <mailto:Freetel-codec2@lists.sourceforge.net> > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > <https://lists.sourceforge.net/lists/listinfo/freetel-codec2> > > > > > > ------------------------------------------------------------------ ------------ > > > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Freetel-codec2 mailing list > > Freetel-codec2@lists.sourceforge.net > > <mailto:Freetel-codec2@lists.sourceforge.net> > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > <https://lists.sourceforge.net/lists/listinfo/freetel-codec2> > > > > > > ---------------------------------------------------------------------- -------- > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Freetel-codec2 mailing list > > Freetel-codec2@lists.sourceforge.net > > <mailto:Freetel-codec2@lists.sourceforge.net> > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > <https://lists.sourceforge.net/lists/listinfo/freetel-codec2> > > > > > > > > > > -------------------------------------------------------------------------- ---- > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > > > > > > _______________________________________________ > > Freetel-codec2 mailing list > > Freetel-codec2@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > ---------------------------------------------------------------------------- -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Freetel-codec2 mailing list > Freetel-codec2@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 Alan Evil flourishes when good men do nothing. Consider the Christmas child. --------------------------------------------------------------------------- Alan Beard Unix Support Technician from 1984 to today 70 Wedmore Rd. Sun Solaris, AIX, HP/UX, Linux, SCO, MIPS Emu Heights N.S.W. 2750 Routers, terminal servers, printers, terminals etc.. +61 2 47353013 (h) Support Programming, shell scripting, "C", assembler 0414 353013 (mobile) After uni, electronics tech ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
