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Re: [Discuss-gnuradio] QT Vector sink question?


From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] QT Vector sink question?
Date: Mon, 21 May 2018 14:57:52 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 05/21/2018 02:50 PM, Glen I Langston wrote:
Hello all,

Thanks for all the interesting discussion.  Very educational.

I’ve got a pair of questions concerning the QT vector sink.

My application uses the vector sink for plotting and diagnostics
of averaged spectra.

I’m getting the impression that the QT vector sink is using a good fraction
of my computer resources, despite trying to reduce the update intervals.

My question is 1) can I somehow turn off the Min and Max functions and any
averaging of the data in the QT vector plotter?

The second question concerns a waterfall plot for the vectors I’m
generating.   The QT waterfall plot does not accept a vector.
If I turn the vector back into a stream, then the QT waterfall plot then
Fourier transforms the spectra back. making a mess.

So the Second question: 2) is there a way to provide the QT water fall plotter
with a Vector and not have it FFT the data?

Thanks

Glen

FYI The code for Radio Astronomy is currently available
(both observing interface and examples) at:

git clone http://www.github.com/glangsto/gr-nsf


Glen:

I use the Qt Vector sink extensively in spectro_radiometer, and I don't find that it consumes a lot of CPU.

But I only "drive" it at fairly low effective sample rates -- you should perhaps see the way spectro_radiometer does it....




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