Paul, This is indeen NI-USRP capture. So you think the Cfile that I've created using gr_fileman and gr_mkheader isn't correct? I can see lots of good data by loading the cfile in Gqrx. I think it's working, am I wrong?
Also I had another question, I converted my file to Wav file after demodulation (GMSK). Here is audio file loaded in Audacity: http://imgur.com/a/CllLI I can't properly figure out what's symbol rate here, can't clearly distinguish 0 and 1s to count, then diff the time and find out symbol rate. I would really appreciate any help/hint/advise. Thank you! On Thu, Dec 1, 2016 at 4:16 PM, Garver, Paul W <[email protected]> wrote: > Cheers, and thanks for finding the error. Also, you should note that the > USRP scales fc32 format to +\- 1, but the sc16 format is ADC levels. > gr_fileman doesn't scale during the conversion, so .sc16 converted to .fc32 > will be scaled differently than straight out of the USRP. > > Paul Garver > > > On Dec 1, 2016, at 2:08 PM, AndroidT Tester <[email protected]> > wrote: > > Hello Paul, > > Indeed it's working now :) I successfully converted my 16-bit IQ sample > file to a Cfile :) Thanks for all your help!! > > On Thu, Dec 1, 2016 at 4:04 PM, Garver, Paul W <[email protected]> wrote: > >> I think you found an error in gr_mkheader! In truth, it isn’t >> particularly well tested so I’m glad you are using it. I just pushed a >> commit to fix this to github. git pull the changes, rebuild, and try again. >> Let me know if it solves the issue for you. >> >> PWG >> >> On Dec 1, 2016, at 11:46 AM, AndroidT Tester <[email protected]> >> wrote: >> >> Thank you once again Paul. >> >> ls -la >> drwx------ 1 Username Username 4096 Dec 1 13:40 . >> drwx------ 1 Username Username 12288 Nov 30 16:21 .. >> -rwx------ 1 Username Username 7683964928 Nov 20 18:23 Sample-408MHz >> >> gr_mkheader -r 1.8e6 -t sc16 -f 408e6 -l 1920991232 Sample-408MHz >> >> >> Now I have Sample-408MHz.hdr: >> gr_read_file_metadata Sample-408MHz.hdr -D >> HEADER 0 >> Version Number: 0 >> Sample Rate: 1800000.00 sps >> Seconds: 0.000000 >> Item size: 4 >> Data Type: short (1) >> ..... >> ..... >> .... >> >> >> etc. >> >> Now when I do >> >> gr_fileman Sample-408MHz Sample.cfile -o fc32 >> >> I get >> sample_cnt_end=500000,final_index=1920991232 >> Empty Header, quitting. >> >> >> >> >> On Thu, Dec 1, 2016 at 1:35 PM, Garver, Paul W <[email protected]> >> wrote: >> >>> It probably can’t find the header. The command >>> >>> # gr_mkheader -r 1.8e6 -t sc16 -f 408e6 -l 1920991232 Sample-408MHz >>> >>> should produce the file "Sample-408MHz.hdr" >>> >>> Check that the file Sample-408MHz.hdr is produced. You can read it with >>> >>> # gr_read_file_metadata Sample-408MHz.hdr -D >>> >>> Then, >>> >>> # gr_fileman Sample-408MHz Sample-408MHz.cfile -o fc32 >>> >>> Sample-408MHz should be the raw data, and Sample-408MHz.hdr the metadata >>> produced with gr_mkheader. This should produce >>> Sample-408MHz.cfile and Sample-408MHz.cfile.hdr. >>> >>> On your copied command it appears you didn’t add the -o fc32 to specify >>> you want a file type conversion. >>> >>> PWG >>> >>> >>> >>> >>> On Dec 1, 2016, at 11:20 AM, AndroidT Tester <[email protected]> >>> wrote: >>> >>> 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 <[email protected]> >>> 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 <[email protected]> >>>> 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 <[email protected]> >>>> 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 < >>>>> [email protected]> 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 < >>>>> [email protected]> wrote: >>>>> >>>>>> Thank you very much! It worked :) >>>>>> >>>>>> On Wed, Nov 30, 2016 at 11:04 AM, Garver, Paul W <[email protected]> >>>>>> 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 < >>>>>>> [email protected]> 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 >>>>>>> > [email protected] >>>>>>> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>>>> >>>>>>> >>>>>> >>>>> >>>>> >>>> >>>> >>> >>> >> >> >
_______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
