Signal Procesing

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Hi,
I am looking for advice. I have a mouse with sensors. One of them is retreaving signal which anables to calculate pulse. In general what I recive from that sensor are numbers like
2423
2404
2382
2357
2332
2308
2285
2265
2244
2228
2215
2206
2205
2205

and so on. Problem is when I take my finger of sensor, numbers start to jump from 0 to 5000 :

2260
2405
2738
3395
4095
4095
4095
4095
4095
4095
4095
4095
4095
4095
4095
4095
4095
4095
4095
4095
4095
4095
3528
1955
1
0
0
0
0
0
1
1
0
53
335
818
1443
2145

What method you would suggest to handle such jumps and to correct them aproximetly to normal incoming values?

Posted 21-Oct-10 2:51am

nestor0424

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Khaniya 21-Oct-10 9:22am

I think it is depend on your sensor, so i suggest you to prefer catalog of sensor

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OriginalGriff · Accepted Answer · 2010-10-21T08:29:00

What you do depends on what your sensor is actually reporting: by the look of the numbers it seems to be a time period of some sort between successive Systolic or Diastolic pulses, with a twelve bit counter.
If so, then you may have to disregard maximum (4095, hex FFF) and minimum values, or use a more complex "similarity" check to eliminate the spurious readings.
It is going to depend on what you are using the equipment for - it can't be safety critical because no-one holds on to the mouse all the time!