[OpenTRV-dev] V0.2-Arduino

[Mike Stirling]

----------------original message-----------------
From: "Damon Hart-Davis" EMAIL ADDRESS HIDDEN 
To: "Closed list for developer discussions" EMAIL ADDRESS HIDDEN 
Date: Mon, 22 Apr 2013 07:58:47 +0100
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> 
>> Occupation detection by sound is an interesting idea. Do you even need to go as 
>> far as an FFT?
> 
> Don't know, but it might be better than filling the board with passives. (Many 
> many moons ago I made some primitive sound interaction stuff for toys before the 
> possibility of DSP.)

If you are just considering peak detection in the voice band then this might be best implemented on an AVR using one or more IIR filters. This would be a software equivalent to a board full of passives (which you can't avoid by the way; you will always need at least an anti-aliasing filter).

Mike

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