How to extract the signal out from the waveform by my designated power level?

Dear all,
How can I extract the signal from the waveform accroding to the power level? I read the Trigger&Gate.vi, but this vi extract signal according to the duration time. I want to extract signal according to power level.
As shown in the following figures, the signal I want to process is between 130000 to 140000, if I zoom in, I can see the the useful signal is between 135400 to 138200. The question is how to extract the signal in the zone?
I tried the sub_NoiseEst_And_Chop_Shell.vi in the Packet_based_link example too, but this subvi seemed to be a little slow. Can anybody give me better advice? Thanks in advance!
Solved!
Go to Solution.

I was working on something similar but haven't had time to fully develop it.
My idea was to use an envelope detector (low pass filter) and then use an energy detection VI on the envelope.
Here's where I left off
Anthony F.
Product Marketing Engineer
National Instruments
Attachments:
test.vi ‏331 KB

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