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[Discuss-gnuradio] Confused by 4xN FFT output


From: Christopher Richardson
Subject: [Discuss-gnuradio] Confused by 4xN FFT output
Date: Sun, 12 Jun 2016 16:39:18 +0100

Hi,

I'm just wondering if I'm missing something obvious

I've created a simple Python block to take the complex
output from an FFT block.

in_sig=[(numpy.complex64,1024)],   

So it takes complex numbers from the FFT, I assumed that
there would only be 1024 complex numbers.

In the worker function I do:

in0 = input_items[0]
in0.shape gives me: (4, 1024)

So I'm wondering how come there are 4 lots of 1024 complex numbers?

It's not just bundling 4 lots outputs together is it?

cheers

Chris

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