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From: | Markus Feldmann |
Subject: | [Discuss-gnuradio] Re: uses gr.file_sink 32 bit or 64 bit |
Date: | Mon, 30 Mar 2009 17:54:21 +0200 |
User-agent: | Mozilla-Thunderbird 2.0.0.19 (X11/20090103) |
Patrick Strasser schrieb:
feldmaus wrote am 2009-03-27 20:52:Further on my graphic does not look like my spectrum in the FFT-sink.A FFT sink displays the frequency domain, it's amplitude versus frequency. Printing the samples shows the time domain, amplitude versus time. The FFT sink feeds the samples through a FFT-block, resulting in its name. A scope sink just plots the samples, as you try with Matlab/Octave.
You are right, thats also what i am thinking, but to these samples through a fft, i have to know what is a sample ! Thats the topic of this post. Thats what i not understand. What is a sample ? For example, is this ONE sample ? 24 + 5i The left is a 32bit I part and the right is the Q part ? But as i read I and Q are complex, so i sink I and Q will be changed from line to line ? If i need more than one line for one sample, how many lines do i need for the fft ? Regards Markus
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