On Wed, Dec 12, 2007 at 08:47:44AM -0500, Robert Roberts wrote: > 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~ >
Hi Chris, can you please send it again. IIRC, the pre-emph filter that's specified in the specs I looked at were not exactly the inverse of the de-emph. Eric _______________________________________________ Patch-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/patch-gnuradio
