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[Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit
From: |
feldmaus |
Subject: |
[Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit |
Date: |
Fri, 27 Mar 2009 19:52:51 +0000 (UTC) |
User-agent: |
Loom/3.14 (http://gmane.org/) |
Johnathan Corgan <jcorgan <at> corganenterprises.com> writes:
>
> Just to make this completely clear:
Very very thank you Johnathan.
Ok, so i think the gnuradio docu should be updated, because there is
written:
"Data captured directly from the USRP is stored as 32-bit complex, rather than
64-bit complex (gr.sizeof_gr_complex)."
But I+Q is 64 bit complex as you said.
So i have to use the read_complex_binary() function which has
gr.sizeof_gr_complex(64 bit) . So the docu should write:
"Data captured directly from the USRP is stored as 64-bit complex, rather than
32-bit complex."
Further on my graphic does not look like my spectrum in the
FFT-sink.
Therfore should something added, like
how to show this correctly:
c=read_complex_binary('data')
t=100:1:length(c)
f=20*log10(fft(t,c(t)))
plot([real(f), imag(f)])
But this sentences doesn't work correcctly.
I am working on this.
How ever the above has another error???
The <plot> command mixes the real part from I and Q together as
the imag part from I and Q too.
Is this correct ???
Further on the data should go through a fft() and a 20*log()
function ???
My FFT has a size of 1024 is this relevant for the fft() function ?
Regards Markus
- Re: [Discuss-gnuradio] uses gr.file_sink 32 bit or 64 bit, (continued)
- Re: [Discuss-gnuradio] uses gr.file_sink 32 bit or 64 bit, Johnathan Corgan, 2009/03/26
- Re: [Discuss-gnuradio] uses gr.file_sink 32 bit or 64 bit, Eric Blossom, 2009/03/26
- [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit, Markus Feldmann, 2009/03/26
- [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit, Markus Feldmann, 2009/03/26
- [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit, feldmaus, 2009/03/27
- Re: [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit, Brian Padalino, 2009/03/27
- [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit, feldmaus, 2009/03/28
- Re: [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit, Brian Padalino, 2009/03/28
- [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit, feldmaus, 2009/03/27
- Re: [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit, Johnathan Corgan, 2009/03/27
- [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit,
feldmaus <=
- [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit, Patrick Strasser, 2009/03/30
- [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit, Markus Feldmann, 2009/03/30
- [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit, Patrick Strasser, 2009/03/31
[Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit, feldmaus, 2009/03/28