Hi Jeroen, Hey well done that's sounding pretty good except for that last guy :-) It would be good to break the samples out and compare with the existing 700C and 1300 modems.
Brady O'Brien has also been doing some work on improving 700C, one innovations was extending the low freq response. Cheers, David On 04/05/17 09:40, Jeroen Vreeken wrote: > Hi all, > > It has been a while, but I did make some steady progress. > (Trying different training strategies can take days at a time) > I made a new version of the patch with some changes: > > - I cut out a lot of silence and noises from the training material (like > the breathing). There is no real point in reproducing such noises > perfectly. I also added David's samples and some other nice ones I found > that where different from all I already had. (Also some children voices) > - Instead of three times 256 values (resulting in 24 bits) I used two > tables of 1024 values. (20bits). 24 bits of course give a slightly > better result, but I think the bits are better used now. On average the > error is about 1.7dB lower than 700C. > - Wo and Energy each get an extra bit. > - The last two bits are used for voicing. One of the things I noticed > when listening to audible artifacts was that the combined Wo and voicing > was resulting in Wo being interpolated from the hardcoded non-voiced > default back to the voiced value. This sometimes results in an audible > pitch shift. Having a voice bits seperatly makes this a bit less likely. > > Sample: > http://video.vreeken.net/~dml/patches/all.1300C_10b10b5e7wo2v.wav > > 73, > Jeroen PE1RXQ > > > > ------------------------------------------------------------------------------ > 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
