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> Programmable Audio Switch
mitro
Posted: September 07, 2011 02:43 pm
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It's ages since I've made any electronic gadgets, so I would really appreciate any help that anyone can offer. What I would like to make is a sound activated switch to operate a mains circuit which will only respond to the sounds that I programme into it. There seem to be any number of simple switches advertised to respond to 'claps' but nothing more sophisticated. I would also like to incorporate a multi directional, sensitive sensor. If ayone knows of something which already exists, perhaps you'd let me know. Otherwise, any help gladly received.
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GPG
Posted: September 08, 2011 01:32 am
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What sort of sounds? Google fast fourier transform. Then google fast fourier transform microcontroller.
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mitro
Posted: September 08, 2011 08:09 am
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Thanks for the suggestions. That will certainly give me something to get my head around.
Specifically, I would like to design a switch which will respond to the sound of an incoming helicopter. As I said, it would be fun to be able to programme it to any sound, but at the moment helicopters are what I'm interested in.
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CWB
Posted: September 08, 2011 08:21 am
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template comparison/analysis is going to be needed .


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GPG
Posted: September 08, 2011 06:12 pm
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QUOTE
the sound of an incoming helicopter
IME helicopters have a charateristic sound that varies with make/model, so _theoretically_ a FFT should be able to tell you this. As long as you have a chacteristic model to compare it to. ^CWB. Starting to sound like a software problem.
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MacFromOK
Posted: September 09, 2011 01:54 am
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QUOTE (mitro @ September 08, 2011 02:09 am)
Specifically, I would like to design a switch which will respond to the sound of an incoming helicopter.

Are the chopper(s) loud enough (above ambient noise at the LZ) to use a simple audio volume-level trigger?

Or... would rotor frequency range be narrow enough for something like a simple tone decoder?

Or perhaps combine the two for greater accuracy.

Just a thought. beer.gif


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CWB
Posted: September 09, 2011 11:24 pm
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a minigun (ie : puff) has a very distinctive sound template .
this is the one i would want to know about . wink.gif


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johndev
Posted: January 16, 2012 10:46 pm
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QUOTE (CWB @ September 08, 2011 08:21 am)
template comparison/analysis is going to be needed .

I think so
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