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Re: [Patch-gnuradio] FM Preemphasis Filter

From: Eric Blossom
Subject: Re: [Patch-gnuradio] FM Preemphasis Filter
Date: Wed, 12 Dec 2007 10:27:00 -0800
User-agent: Mutt/1.5.17 (2007-11-01)

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"
> core/src/python/gnuradio/blksimpl/
> 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.


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