Hello Brian,
Please send me a patch against codec2-dev generated using "diff -ruN".
Yes in the initial version of the modem we couldn't vary the number of
carriers.
I use Ubuntu 12.04 with Octave 3.2.4 which works just fine, and has
fir1() available, I think in octave-signal package. Would be nice to
have a README somewhere with a list of all the Octave packages/toolboxes
rqd.
I've also made a similar change to codec2-dev/octave/fdmdv.m for a
default Nc.
Yes it's possible the instructions for fdmdv_demod() are out of date
too. I'm in the middle of modem surgery just now so it's unlikely that
fdmdv_demod.m will run properly for a while. But is it is wonderful to
see someone else using the simulations (or trying to)!
Richard/Bruce/Others - up to you if you want to patch/fix codec2 (as
distinct to codec2-dev) - I just really want to be responsible for
codec2-dev.
Thanks for the feedback Brian,
David
On Fri, 2014-06-20 at 01:51 -0700, Brian Bartholomew wrote:
> > I've started tinkering with the pieces of freedv, and I've found two
> > problems: The "Nc" number of channels parameter in fdmdv_demod does
> > not appear to be optional as shown on two rowetel web pages, and
> > fdmdv_demod is producing NUL bytes for output.
>
> I have a patch to fix argc/argv parsing in codec2/src/fdmdv_demod.c
> which fixes the Nc argument and gets the octave data dump working.
>
> I have a recipe to change Ubuntu 12 from version 3.2 of Octave to
> version 3.8 which the signal toolbox wants, as it contains function
> fir1 which the octave function fdmdv_demod_c uses.
>
> I have a patch to codec2/octave/fdmdv.m which fixes the default
> setting of Nc to 14 when NumCarriers isn't defined. Was NumCarriers
> defined in the fdmdv_demod octave dump in the past?
>
> However, I'm a Mercurial person and not a svn person, so I don't yet
> know how to offer these changes to you with svn.
>
> Then I ran octave:2> fdmdv_demod_c("/tmp/demod_dump.txt",1400) and
> received two plots, Scatter Diagram and timing offset, then an error
> that coarse_fine_log_c is undefined. That variable is not dumped in
> codec2/src/fdmdv_demod.c, perhaps it was done previously in the
> commented-out //fdmdv_dump_osc_mags(fdmdv); ?
>
> Brian
>
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