This works! Thanks a lot! Ralph.
>-----Original Message----- >From: Marcus Müller [mailto:[email protected]] >Sent: Wednesday, March 16, 2016 10:24 >To: Ralph A. Schmid, dk5ras; [email protected] >Subject: Re: [Discuss-gnuradio] lack of understanding the different formats to >store samples > >Ok, let "I" and "Q" be single bits each, so each byte would then be > >IQIQIQIQ > >if I had to take a guess. > >You can get get back something that GR commonly deals with by doing > >packed to unpacked (type=B, bits per chunk = 1, endianness=your machine) >-> IChar to Complex > >Best regards, >Marcus >On 16.03.2016 08:13, Ralph A. Schmid, dk5ras wrote: >> Each byte seems to contain 4 1 bit I/Q samples. This is the text from >> the >> readme: >> >> "The output file size can be reduced by using "-b 1" option to store >> four 1-bit I/Q samples into a single byte." >> >> Ralph. >> >>> -----Original Message----- >>> From: [email protected] >>> [mailto:[email protected]] On Behalf >>> Of Marcus Müller >>> Sent: Friday, March 11, 2016 2:53 PM >>> To: [email protected] >>> Subject: Re: [Discuss-gnuradio] lack of understanding the different >> formats >>> to store samples >>> >>> In what format are your 1bit samples? I'd assume they are just the >>> fact whether a byte is 0x00 or 0x01; in that case, just use unpacked to packed. >>> >>> On 03/11/2016 10:24 AM, Ralph A. Schmid, dk5ras wrote: >>>> Hi, >>>> >>>> Being an RF guy I must admit that I am somehow lost in the different >>>> ways how samples are stored in files. I stumbled over this question >>>> when I experimented with https://github.com/osqzss/gps-sdr-sim. It >>>> works great when using 16 bit samples and using a simple two-block >>>> grc file, feeding them directly from a file source to the UHD sink. >>>> However the 1 bit variant sounds promising, as the files are much >>>> smaller this way and also the generation of them runs much faster. >>>> >>>> It must only be a matter of finding the right blocks and the right >>>> settings to convert this, but my google search was highly confusing, >>>> most probably due to different names for the same thing. >>>> >>>> So I do not only ask for how to use "four 1-bit I/Q samples into a >>>> single byte" (taken from the readme of the gps-sdr-sim), but for a >>>> more general overview how this stuff is done, to be prepared for >>>> other upcoming questions of this kind :) Up to now I solved those >>>> issues by an educated guess or even by try and error, what is not >>>> very >> satisfying... >>>> Ralph. >>>> >>>> >>>> _______________________________________________ >>>> 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 _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
