Marcus, Sorry for the late reply on this, I've been upgrading my hardware and I'm just catching up. Here is my issue, in Spectrum lab if I provide a FFT Input length of 65536 on a 192Ksps stream, I get the following characteristics:
Effect of FFT settings with fs= 192.000 kHz: Width of one FFT-bin: 2.92969 Hz Equiv. noise bandwidth: 4.39453 Hz Max freq range: 0.00000 Hz .. 96.0000 kHz FFT window time: 0.341 s Overlap from scroll interval: 98.4 % It runs quite fast. If I provide the same FFT size to WX GUI FFT sink, it basically hangs. Do you know why? Regards, Mark McCarron Date: Sat, 11 May 2013 15:59:18 -0400 From: mle...@ripnet.com To: mark.mccar...@live.co.uk; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] WX GUI FFT Sink Performance I figured that one out, but why is the performance so poor? In other applications, I can push over half a million samples without causing issues. Regards, Mark McCarron Your OpenGL implementation may suck. What sample rate are you using? If it's quite a low rate, then with a large number of bins, there may be no way to achieve the given frame rate, given the sample rate, and FFT size. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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