Re: [Discuss-gnuradio] analysis_filterbank question

[Eric Blossom]

On Mon, Jan 05, 2009 at 06:52:56PM +0200, Sebastiaan Heunis wrote:
> Hi
> 
> I'm trying to use blks2.analysis_filterbank.  I assume that I need to
> instantiate it like this:
> 
> self.channeliser = blks2.analysis_filterbank(num_fft,taps)
> 
> where num_fft refers to the number of channels and taps can be left empty.
> 
> I tried self.channeliser = blks2,analysis_filterbank(16) (and 8 and
> 20).  None of these work.  I get the following error:
> 
> terminate called after throwing an instance of 'std::out_of_range'
>   what():  gri_fftw: invalid fft_size
> Aborted
> 
> Does anyone know what's wrong?  If I get it to work, do I just connect
> each output path that I'm interested in to a block, similar to when
> using a mixer in the fm examples?
> 
> Thanks a lot.
> 
> Sebastiaan

Unlike what the code would lead you to believe, you have to provide
the filter taps.  See gr-pager/src/usrp_flex_band.py for a working example.

Eric