Re: NBFM from DDS chip

From: Steve Nosko (suteuve.nosukowicuz_at_moutouroula.com)
Date: 08/30/04 

Date: Mon, 30 Aug 2004 12:54:43 -0500

"Tim Wescott" <tim@wescottnospamdesign.com> wrote in message
news:10j6dkgrmvcti69@corp.supernews.com...
> MikeN wrote:
> > Hi
> >
> > Has anyone given thought to producing NBFM using the AD 9854 or
> > similar DDS chips, for multiplying or heterodyning up to 2m or 70cm.
> >
> > This could be an interesting project. I see Analog Devices has an
> > application note AN-543 which describes a stereo WBFM generator with
> > output on 90.3 MHz.
> >
> > 73 de MikeN ZL1BNB
>
> I've been considering it for years; it should work OK as long as your
> sample rates are high enough. In fact there are nice, small DSP chips
> now that should implement a good FM receiver to go along with it for a
> complete transceiver.
>
> It's never been a paying project for me, and it's never made it to the
> top of the "home brew" pile, so it stays in "would be cool" land.
> Tim Wescott
> Wescott Design Services
> http://www.wescottdesign.com

I wouldn't be surprised if this wasn't the algorithm used in DSP generation
of FM.

It was used to generate four part music, in software, back in the early 80's
with a 0.9 MHz 6809 CPU. 

-- 
Steve N,  K,9;d, c. i  My email has no u's.

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