02-16-2013 10:19 AM
02-16-2013 03:58 PM
Himmet,
The best option may depend on how much you know about your signal and the noise. The rising edges in the datset you posted vary about 10% from being equally spaced in time. If you know that the spacing can never vary more than that, you can only look for rising edges in those small windows.
Another approach is to look at the width of the low pulses. It appears that the desired signal has a wider pulse width (low) than the noise.
The VI attached shows looking for rising edges at two different threshold voltages. The lowest threshold for which all of the low threshold edges have an equal high threshold edge will find all the desired edges. This VI has a difference of 1 V between the thresholds, but that may not be optimum.
This is not intended to be a final solution but just some ideas to get you started.
Lynn