> To:
address@hidden;
address@hidden
> From:
address@hidden
> Date: Wed, 16 Mar 2016 10:24:02 +0100
> 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:
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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> >>
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