Re: [Discuss-gnuradio] Visualizing Amplitude spectrum instead of power s

From:

Federico 'Larroca' La Rocca

Subject:

Re: [Discuss-gnuradio] Visualizing Amplitude spectrum instead of power spectrum

Date:

Wed, 26 Apr 2017 17:07:20 -0300

Hi,

If what you want is to visualize the complex resulting from the DFT, you should use the FFT block, and then a QT

2017-04-26 15:33 GMT-03:00 Fernando <address@hidden>:

El 26/04/17 a las 20:01, Marcus Müller escribió:

I call it simply spectrum too, maybe I should have said magnitude/phase spectrum.
Now I'm confused. Magnitude spectrum is definitely my $|\text{DFT}|$ ; but you're just looking for a plot of the DFT, right?

Yes, but not only magnitude(DFT) but also phase(DFT)

So I'd like to get back to my earlier question:

What is the purpose of this?

I was doing TX+RX of a FM stereo signal and something did not work. I was searching for the error and I found the error was in the modulation or demodulation, but I could not see where.
This diagram was working faulty, and I thought that maybe I was messing up with signs when doing add/substract, so I wanted to see the spectrum with +/- (or phase)

I have found the problem (Thanks to Federico Larroca) and with modifications the diagram works (below) but I still would like to know the previous question

Maybe it is just that I don't understand some things (or a lot of)..... my mathematics knowledge for DSP is far from awsome ;-)

regards

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