kawadave Posted February 18, 2007 Report Share Posted February 18, 2007 I'm needing a inexpensive Voice Activated Switch / Mic to turn a mini 12VDC motor on for 2 to 3 seconds at a time. Problem is it must operate in noisy conditions such as dirt bike motorcycle noise conditions. The mic only is mounted inside a full faced helmet. This will be used in a product going to market so price is a concern.Thanks for your advise,David Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 18, 2007 Report Share Posted February 18, 2007 It is difficult to separate noise from a motorcycle and from voice sounds. They are both in the same frequency band and the motorcycle noise might be louder. Good luck. Quote Link to comment Share on other sites More sharing options...
ante Posted February 21, 2007 Report Share Posted February 21, 2007 Perhaps there could be another solution if you let us know your intentions. Quote Link to comment Share on other sites More sharing options...
BasilBadger Posted February 21, 2007 Report Share Posted February 21, 2007 Hi,I had a somewhat similar problem where a click from a plastic coupling were to stop a test. The test machine was located in a production hall. The solution was to rectify the signal from the microphone to get an "average noise level" the rectified signal was "stored" in a capacitor with a resistor in parallel. As i recal the time constant was around 250msec.That signal was then fed to a differentiator, with a trigger circuit on it's tail.The idea being that a sudden increase in noise level would set off the trigger, not the general noise level itself.After quite a bit of fiddling with amplification and timing, the circuit worked really well. Hope that helps,Basil Quote Link to comment Share on other sites More sharing options...
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