On Thu, 11 Mar 2010 15:31:33 -0300, Mark Jordan wrote:

>      A tutorial about Goertzel:
>
>      http://www.embedded.com/story/OEG20020819S0057
>
>      I have used it for DTMF decoding on an ATmega48 uP.
>
>      Mark Jordan
>

Thanks for that, Mark.

I've seen that one before but had forgotten all about it; would probably have
come in handy when I was writing my application.  C'est la vie.  Not a bad
article.

The Goertzel algorithm is also covered in Richard Lyon's book Understanding
Digital Signal Processing (a very good book), although it doesn't have an
implementation:

http://www.amazon.co.uk/Understanding-Digital-Signal-Processing-Richard/dp/
0131089897/ref=sr_1_1?ie=UTF8&s=books&qid=1268416751&sr=8-1

(or as a tiny URL <http://tinyurl.com/yff8vdx>).  Well worth a read IMHO.

Regards,

Pete Restall
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