Hello all, i want to detect heart rate using iphone sdk does someone knows any method for calculating heartbeat rate?
+1
A:
Well I've seen various implementations. Some of them use the accelerometer to detect minute movements in your arm/hand when you hold the phone, some of them can use the microphone, you could also do a manual 'tap' interface where you tap the screen while checking your own pulse.
Mike Weller
2009-12-07 11:02:10
can you post a sample source using microphone
Rahul Vyas
2009-12-07 11:07:13
Hey mike please guide me
Rahul Vyas
2009-12-17 10:48:04
+1
A:
Fast Fourier Transform is a class of algorithms that can quickly turn samples into an analysis that tells you how prominently ceratin frequencies occur in that sample. For more check out:
- Wikipedia: FFT
- Literate program example: Cooley-Tukey FFT
This is relevant to your problem because: (1) heart rate is itself a frequency, and (2) most of the sound that comes through the body that you can measure will be within a certain frequency range. Dropping frequencies outside this range means dropping all or mostly noise.
Good luck!
Charles Stewart
2009-12-18 22:28:41
i have seen in apple's auriotouch example can you tell me that what is the frequency of heartrate and how do i drop all frequencies other than heart rate.Have you seen auriotouch sample.If not please have a look and tell me where to change the code and help me to achieve the result.Thanks
Rahul Vyas
2009-12-19 10:16:08