Thank you Paul, I got this; sample_cnt_end=500000,final_index=1920991232 Empty Header, quitting.
I followed all your instructions and double checked all parameters. I did filesize / 4 for sample count. I did this first: gr_mkheader -r 1.8e6 -t sc16 -f 408e6 -l 1920991232 Sample-408MHz Then when I try to do: gr_fileman Sample-408MHz Sample.cfile I got the error above, what am I missing? On Thu, Dec 1, 2016 at 12:07 PM, Garver, Paul W <garv...@gatech.edu> wrote: > There are two different metadata types: > 1) Inline > 2) Detached > > Here, you are using the detached headers. With detached, the raw samples > are in a file, say myfile.sc16, and the metadata in myfile.sc16.hdr. See > [1] for more information on GNURadio metadata. > So suppose you have myfile.sc16 as your raw sample file. Then you generate > headers for it, since you didn’t record it with any. You also need to give > gr_mkheader -l num_samps so it knows how long the file is. For sc16 you > just do file_size_bytes/4 to get # of samples in a file. > > # gr_mkheader -r 1.8e6 -t sc16 -f 408e6 myfile.sc16 > > This generates the file: myfile.sc16.hdr containing the file type, center > frequency, sample rate, etc. This is simply my convention, but the metadata > is “linked” to the raw samples by the filename > raw data: myfile.sc16, where sc16 specifies the file format. > metadata: myfile.sc16.hdr > > Then, you can give this to gr_fileman to convert the type: > > # gr_fileman myfile.sc16 myfile.fc32 -o fc32 > > gr_fileman looks for filename.hdr for the detached header info. So in this > case, it files myfile.sc16.hdr, and should happily convert for you. > > PWG > > > > > > [1] http://gnuradio.org/doc/doxygen/page_metadata.html > > On Dec 1, 2016, at 9:45 AM, AndroidT Tester <itestandroid2...@gmail.com> > wrote: > > Thank you Paul, I never heard of gr-analysis before. > So I tried this: > > gr_mkheader -r 1.8e6 -t sc16 -f 408e6 myheader > > This only created myheader.hdr file. How can I link this to my actual > recording sample which is 16-bit IQ pair and then convert it to CFile? > Do I concatenate the files? put myheader.hdr at top of my recording? > Sorry again for these newbie questions > > > > On Thu, Dec 1, 2016 at 11:32 AM, Garver, Paul W <garv...@gatech.edu> > wrote: > >> Please copy the list next time so other folks can respond besides me. >> >> Just attach a file sink to the ishort to complex block. There’s also a >> command-line tool called gr_fileman in gr-analysis [1] which will do this, >> but the file needs headers. If you don’t have them, you can generate with >> gr_mkheader in gr-analysis. >> >> [1] https://github.com/garverp/gr-analysis >> >> Hope this helps, >> PWG >> >> On Dec 1, 2016, at 9:22 AM, AndroidT Tester <itestandroid2...@gmail.com> >> wrote: >> >> Now, how can I convert this to a CFILE format where I can play it in >> Gqrx? Thank you >> >> On Wed, Nov 30, 2016 at 11:34 AM, AndroidT Tester < >> itestandroid2...@gmail.com> wrote: >> >>> Thank you very much! It worked :) >>> >>> On Wed, Nov 30, 2016 at 11:04 AM, Garver, Paul W <garv...@gatech.edu> >>> wrote: >>> >>>> Use a file source block with “short” type into an “Ishort to Complex” >>>> block. The Ishort to Complex block will de-interleave the shorts into >>>> complex samples. >>>> >>>> PWG >>>> > On Nov 30, 2016, at 8:55 AM, AndroidT Tester < >>>> itestandroid2...@gmail.com> wrote: >>>> > >>>> > Hey guys, >>>> > >>>> > I have a sample file with IQ pairs, each I and Q is 16-bits, I want >>>> to load this in GNURadio companion using File source sink, but I'm not sure >>>> how can I specify 16-bit format for I and 16-bit for Q in Gnuradio >>>> companion and then connect it to lets say FFT or Waterfall widget. Can >>>> someone advise a bit? >>>> > >>>> > Thank you! >>>> > _______________________________________________ >>>> > Discuss-gnuradio mailing list >>>> > Discuss-gnuradio@gnu.org >>>> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>> >>>> >>> >> >> > >
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