Steve, Thanks for the clarification and the reasoning behind c2 files. I can work with WAV files to get the data I need using the routines you mentioned and I now have a better understanding of what c2 files are for.
Much appreciated, Ryan N2BP On Wed, Jul 19, 2023, 9:27 AM Steven Franke via wsjt-devel < wsjt-devel@lists.sourceforge.net> wrote: > Ryan, > > The -c option does what it was designed to do: "-c write .c2 file at the > end of the first pass". It writes a .c2 file after signals decoded in the > first pass have been subtracted. This .c2 file is useful for studying the > effectiveness of signal subtraction, i.e. to study the residuals left after > subtracting signals. It can also be re-analyzed by wsprd to study the > effectiveness of a 2nd pass over the data and then again to do a 3rd pass, > etc. > > If you need a .wav to .c2 converter, you might consider using the routines > provided with wsjtx to create one. WSJT-X does the conversion from 12000 > samples/sec to 375 samples/sec in src/widgets/mainwindow.cpp by calling the > fortran routines in these files: > > /src/lib/wspr_downsample.f90:q > /src/lib/savec2.f90 > > Subroutine wspr_downsample() downsamples from 12000 integer samples/sec to > 1500 complex samples/sec and function savec2() downsamples from 1500 to 375 > complex samples/s and writes out the .c2 file. > > Steve k9an > > On Jul 18, 2023, at 4:07 PM, Tolboom, Ryan via wsjt-devel < > wsjt-devel@lists.sourceforge.net> wrote: > > Good Evening, > > When using wsprd in multi-pass mode (no '-s' option) and passing it > the '-c' option to write a c2 file, it > writes the c2 file at the end of the main loop on the first pass AFTER > it subtracts out the decoded > candidates. This means if you're using the c2 file to do analysis of > the IQ data that was decoded you > don't have the actual signals available (at least the ones decoded on > the first pass). > > Is there any particular reason the c2 file is written after the first > pass? The only real changes I noted > to idat and qdat within the main loop were signals being subtracted. > Could it be written before the > main loop after idat and qdat are created from a wav or c2 file? If > so, I've attached a patch for > wsprd.c that moves the logic that calls writec2file to right before > the main loop. > > Thanks for your time, > > Ryan Tolboom N2BP > <c2_before_subtract.patch>_______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel > <https://urldefense.com/v3/__https://lists.sourceforge.net/lists/listinfo/wsjt-devel__;!!DLa72PTfQgg!P0Z0BfA7H_2-3YejyeU8AgOzQaFg1hGXYWWzaWEXWGWE1g-2unLJNWNRdLqbGI4A1g5ByRt0JO6w5NpQuXNWr6pEnowSyhsU$> > > > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > > https://urldefense.com/v3/__https://lists.sourceforge.net/lists/listinfo/wsjt-devel__;!!DLa72PTfQgg!P0Z0BfA7H_2-3YejyeU8AgOzQaFg1hGXYWWzaWEXWGWE1g-2unLJNWNRdLqbGI4A1g5ByRt0JO6w5NpQuXNWr6pEnowSyhsU$ >
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