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How does it work? PDF Print
Written by Anatoly Butko   
Jan 02, 2009 at 11:36 PM
 

Try to keep your hand motionlessly. You got it? Actually it is impossible, your hand always moves.

These fluctuations contain some internal sources like breath, heartbeats, muscles movements and external sources like wind, shivering car or whatever else.

 If your heartbeats are strong enough it is quite easy to define your heartbeats rate, just collect hand fluctuations using built-in iPhone accelerometer, spread out it into flat spectrum and find the highest spectrum line.

 Spectrum with strong heartbeats:

spectrum_strong_raw

 But if your heartbeats is not so strong, or you keep iPhone in heavy or soft case, or you got strong noise or shivering, the task becomes more difficult. 

Spectrum with weak heartbeats and strong noise:

spectrum_weak_raw

 You need to use filter to cut off noise out of usual range of human heartbeats rate.

 Noise filtering function:

spectrum_filter

 

Actually this function is already implemented, you just need to set values for low and high thresholds in settings section of iHeart to customize your personal heartbeats range.

Filtered spectrum with strong heartbeats:

spectrum_strong_filtered

  Filtered spectrum with weak heartbeats and strong noise:

spectrum_weak_filtered

 But even your heartbeats are weak or you are at shivering place or your iPhone is inside of heavy or soft case, you always can help your iPhone to calculate heartbeats rate confidently enough by moving it in time of your heartbeats.

 

 

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