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

[Markus Feldmann]

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
Thanks for your posts,

so if i really want to plot this data
in octave i have to collect every 32bit samples ?

If i only plot the vector containnig the float samples:
c=read_complex_binary('usrp_output_64bit_complex_only_sin_signal.dat');
t=1:1:100;
plot([real(c(t)), imag(c(t))])
i got for the beginning,
http://img90.imageshack.us/my.php?image=from1to100bits.jpg

And if i do,
t=100:1:164;
plot([real(c(t)), imag(c(t))])
http://img90.imageshack.us/my.php?image=from100to164bits.jpg

Regards Markus