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

[Ralph A. Schmid, dk5ras]

This works! Thanks a lot!

Ralph.


>-----Original Message-----
>From: Marcus Müller [mailto:address@hidden
>Sent: Wednesday, March 16, 2016 10:24
>To: Ralph A. Schmid, dk5ras; address@hidden
>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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