[Patch-gnuradio] FM Preemphasis Filter

[Robert Roberts]

Hello,

A couple years ago I was working with GNURadio and noticed that the 
filtering weights for the Preemphasis Filter used in FM transmission 
had not been implemented. I submitted some code at that time.  I was 
browsing the source and found that it's still listed as a "FIXME"

http://gnuradio.org/trac/browser/gnuradio/trunk/gnuradio-
core/src/python/gnuradio/blksimpl/fm_emph.py


The preemphasis filter should be the inverse of the deemphasis filter, 
so copying the deemphasis code and swapping the Ataps for the Btaps 
should implement it.  I did this previously and it worked well.

If there's anyone who's actively working on the code that could update 
this, I'd appreciate it.


Sincerely,
~Chris Roberts~

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