Re: [Discuss-gnuradio] AWAL root raised cosine filter in the GRC trunk?

[Josh Blum]

See http://gnuradio.org/trac/wiki/GNURadioCompanion#FilterDesign

you have access to all the firdes function from inside grc. Just pick 
out an FIR filter block, and enter firdes.root_raised_cosine(...) for 
the taps parameter.

I made a few wrappers around the FIR filters for the pass band taps: low 
pass, high pass... are all in grc. I could easily make another for the 
root raised cosine FIR filter, so you dont have to type this firdes.... 
nonsense.

The issue is that there are a N blocks that take taps as a parameter, 
and there are M taps generators, and it would be hell to make MxN 
convenience wrappers for all of them.

However, I would like to make these convenience blocks for some of the 
combinations. Would RRC FIR be useful? Any other suggestions for some 
practical combinations?

-Josh

Glenn Richardson wrote:
> Where did the root_raised_cosine filter go?
> I recently began exploring GRC in the svn trunk, and quickly realized 
> that the root_raised_cosine filter has gone missing.
> Missing is perhaps too strong of word... the filter exists in the 
> gr_firdes general library, but isn't brought out to a GRC block of that 
> name that I can find.  Do I simply need to create a custom XML wrapper 
> for it, or is it hidden in another filter as an option?  I've begun to 
> edit my "custom" XML filter, but am second guessing myself now.  Is 
> there some other SDR black magic (math) that I don't know?  I'm new to 
> fairly gnuradio and still getting oriented to the source code.
> Thanks in advance,
> Glenn
>
>
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