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> An IR LED+photoresistor is much cheaper. You mean... A tiny camera? A photoresistor is a device which measures light hitting it. It's a 1-pixel camera. In e
by jwalton 8y ago
> An IR LED+photoresistor is much cheaper.
You mean... A tiny camera? A photoresistor is a device which measures light hitting it. It's a 1-pixel camera. In exactly the same way a decibelmeter is a little microphone.
My point is, OP is looking for some complicated algorithm to detect and eliminate speech, but you don't need that - you can just eliminate pretty much everything in the first place.
> Why not? It's a trivial[1] amount of data after you apply a simple noise gate and a low bandwidth codec.
5.6kbit/s to record noise levels is like using a CCD camera and a microprocessor for image detection. You could sample the noise level once every 10 minutes, store it in a uint32, and you'd get 5.6kbit/hundred days. You could ship the data over an SMS link. The units could be battery powered and last months.