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Microphone measurements together with other sensors
Ok, thanks to your reply I understood the lot of issues about audio recording, and that only API sensors can synchronize well.

I like much your idea of knocking them on a table and then put them together on the field, it can work if the long-time stability of internal clocks is ok for every device used. In fact, it takes several minutes to place the smartphones in the correct place. But, this long-time stability check can be an interesting experiment itself!
Another ideas: getting measurements in the evening and synchronize with a big big flash detected by the light sensor... or connecting the smartphones with a wire making a little electric coil near each magnetometer, and then closing the circuit to make a magnetometer detection (this appears more tricky logistically)

One problem of the clock could also be that maybe I should get only smartphones of the same model to make them behave similarly? Also, I heard from someone that each sensors is different from another and everyone has to be calibrated separately, so maybe having the same model of smartphone is not a warranty.

I found that my iphone 6 and my wiko y80 cannot go over 100 Hz (I'm writing 500 in the simple experiment sample rate tab). According to your experience is a matter of smartphone model or I'm missing some way to increase sample rate? For geoseismic surveys this increase in sampling rate is quite fundamental.

I hope you are always interested in this ideas, thank you for your time and helpful suggestions! Have a nice day


Messages In This Thread
RE: Microphone measurements together with other sensors - by andrea - 02-10-2020, 02:03 PM

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