On Thu, Dec 3, 2009 at 10:33 AM, William "Chops" Westfield
<westfw@mac.com> wrote:
>
> On Dec 2, 2009, at 12:01 PM, andrew kelley wrote:
>
>>> The objective is to separate only those 3 frequencies and evaluate
>>> their magnitudes.

Wrong header clipping, I didnt write that..
>
> Isn't this the sort of thing that would traditionally use a set of
> LM576 "tone detector" ICs, each tuned to one of the frequencies? =A0Or
> are those pretty much digital output with no indication of magnitude?

LM567, and they are PLL's and its pretty much a digital output with no
indication of magnitude.  Also prone to temperature variations in the
lockup oscillator in my experience, of course which was limited to a
detector for decoding morse code..

> BillW

Andrew

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