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[Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit


From: Markus Feldmann
Subject: [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit
Date: Thu, 26 Mar 2009 23:21:35 +0100
User-agent: Mozilla-Thunderbird 2.0.0.19 (X11/20090103)

Eric Blossom schrieb:
On Thu, Mar 26, 2009 at 07:32:09AM -0700, Johnathan Corgan wrote:
On Thu, Mar 26, 2009 at 4:12 AM, feldmaus <address@hidden> wrote:

i want to save some output from the usrp and watch it with octave.
The usrp.source_c(...) block generates IQ data as pairs of 32-bit
floating point values.

Or to avoid any confustion about how many samples are getting
generated, I think it's easier to think that it generates samples that
are of type std::complex<float>.

Eric
Yes its confusing me. :-(

Ok, here is a clipping from the data at the beginning:
       0 +     0i
       0 +     0i
      -1 +     0i
       0 -     1i
     -13 +     2i
      65 -    32i
    -183 +    98i
     412 -   233i
    -831 +   478i
    1572 -   918i
   -3050 +  1745i
    8314 -  4139i
  -12548 -  5491i
    3899 + 10329i
    3523 -  2748i
   -1791 +  1379i
     951 -   738i
    -484 +   378i
     219 -   176i
     -84 +    69i
      19 -    20i
       0 +     0i
       0 -     1i
       0 +     0i
       0 -     1i
       0 +     0i
       0 -     1i
       0 +     0i
       0 +     0i
       0 +     0i
       0 +     0i
       0 +     0i
       0 +     0i
       0 +     0i
       0 +     0i
       0 +     0i
       0 +     0i
       0 +     0i
       0 +     0i
       0 +     0i
       0 +     0i
       0 +     0i
       0 -     1i
       0 +     0i
      -1 -     1i
       0 +     0i
      -1 -     1i
       0 +     0i
      -1 -     1i
       0 +     0i
      -1 +     0i
       0 -     1i
       0 +     0i
      -1 -     1i
       0 +     0i
      -1 +     0i
       0 -     1i
      -1 +     0i

How can i collect bits from the I or Q Signal ?
So the first 16 bits from the left side are the I Signal ?
And the first 16 bits from the right side are the Q Signal ?
Where is the beginning of the samples ?
Maybe the curious values at the beginning is the
start point ?

Regards Markus





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