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: discuss-gnuradio-bounces+ralph=schmid....@gnu.org >> [mailto:discuss-gnuradio-bounces+ralph=schmid....@gnu.org] On Behalf Of >> Marcus Müller >> Sent: Friday, March 11, 2016 2:53 PM >> To: discuss-gnuradio@gnu.org >> 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 >>> Discuss-gnuradio@gnu.org >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
