Re: [Discuss-gnuradio] lack of understanding the different formats to store samples

[Ralph A. Schmid, dk5ras]

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: address@hidden
> [mailto:address@hidden On Behalf Of
> Marcus Müller
> Sent: Friday, March 11, 2016 2:53 PM
> To: address@hidden
> 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.
> >
> >
> > _______________________________________________
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> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
> 
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