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  1. I have an on going input signal, most of the time with no activity.
  2. Once in a while there is an activity (oscillations in different freq).
  3. I need to take good 205 samples out of the signal. what i mean by good? really oscillating signal for 205 samples (not just crossing threshold).

here is an image to clarify: oscillating signal bubble 1 - not good selection. bubble 2 - good selection.

I need an efficient way with low computation complexity (for example STFT is heavy), to measure signal's sections oscillation level and chose the best one for further processing, someone knows?

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  • $\begingroup$ can you set a amplitude threshold and a minimum "reaching counts" at the threshold within a given time? $\endgroup$ – lennon310 Mar 4 '14 at 16:28
  • $\begingroup$ Actually i thought about something like this, first crossing a certain threshold, then count crossing above positive threshold and below negative threshold, but i wonder if there is other way more common. $\endgroup$ – Yehuda Mar 4 '14 at 16:40

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