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[Discuss-gnuradio] Display Problem with QT GUI Vector Sink
From: |
gnuradio |
Subject: |
[Discuss-gnuradio] Display Problem with QT GUI Vector Sink |
Date: |
Thu, 03 Sep 2015 11:25:00 +0200 |
User-agent: |
goneo Webmail |
Dear all,
I built an angle-of-arrival system using four Ettus USRP2. I'm facing a
problem when trying to display a vector containing the calculated
MUSIC-Spectrum using a “QT GUI Vector Sink”. The vector sink won't
display any data for the first two minutes, and then it is starting to
show very old values. When I use the block “Vector to Stream” and a
simple “QT GUI Time Sink” instead, the values are displayed immediately
without delay.
The block “music_cf” feeding the vector sink is a sync_decimator,
generating one vector of 181 elements for every 1000 input samples. I've
provided a shortened version of my c++ code in the attachment, without
the actual mathematics.
What could be the reason for this huge delay when using the “QT GUI
Vector Sink”? Is it a buffering problem?
Best regards,
Simon
Block Diagram:
http://fs1.directupload.net/images/150903/7cnqbzup.png
music_cf_impl.cc
Description: Text Data
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