Guitar tuner that uses phone accelerometer

3 comments

• jmusall 1 hour ago
  Fun idea and also I didn't know that websites could get access to my accelerometer data. However for me the sample frequency is 50 Hz which is way too low to measure even the lowest string pitch (E2, about 82 Hz).
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  • hgomersall 31 minutes ago
    If you know you have a single frequency close to an actual frequency of interest, you can use the fact you know you're in an aliased band to get a precise frequency estimate.
• adm4 3 days ago
  guitar detuner that uses accelerometer instead of microphone, it doesn't really work, but amazing to see how sensitive they are.
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  • tgv 1 hour ago
    It also shows that it can leak all kinds of other information.
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    • codethief 51 minutes ago
      …which is why both Android & iOS put high-frequency access to the accelerometer behind an additional permission AFAIR.
• aa-jv 57 minutes ago
  Anyone got a handle on the algorithm required to do this? I've got a pocketable accelerometer-enabled device I'd like to try to implement this on..
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  • simonklitj 54 minutes ago
    Don't have a handle on it, unfortunately. But the algorithm is in here: https://github.com/tautme/phone-sensors/blob/main/guitar-tun.... Esp. lines 221–257 and 373–417.
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    • aa-jv 43 minutes ago
      Ah, that does look like something I can work with - thanks for the legwork, I will check it out and see if its worthwhile converting to C/C++ for my device ..