Re: [Discuss-gnuradio] Building a spectrum analyzer

[Josh Blum]

Use something called message sink and message queue to get data out of a 
gnuradio data stream. The gr-wxgui fftsink does exactly this, so use it 
as an example.

-Josh

Yc Park wrote:
> Hi all,
>
> Recently I started to build a spectrum analyzer with some extra
> functions such as channel power measurements and spectrum mask
> check.(so, fft_sink is not a good solution for this.)
>
> To do so, my plan is this:
> 1. get fft data vector of given size(2048) from usrp2 (data refresh rate
> ~= 5 bins/sec)
> 2. process the data vector with scipy functions
> 3. display it with matplotlib module
>
> But at this time I'm stuck at step2: how can get fft vector so that I
> can proccess it with scipy module?
> Connect() seems to connect blocks, not give out the data vector.
>
> Or the vector_sink.data is not a good choice since I do not have control
> over the data size.
>
> Any good suggestions would be veery much appreciated!!