On Dec 2, 2009, at 12:01 PM, andrew kelley wrote:

>> The objective is to separate only those 3 frequencies and evaluate  
>> their magnitudes.

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?  Or  
are those pretty much digital output with no indication of magnitude?

BillW

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