New answers tagged non-linear
1
This technique is similar to a classical signal processing in seismic being an intendance of "first break picking".
It was proposed in First arrival picking on common-offset trace collections for automatic estimation of static corrections, Françoise Coppens, 1985 (a former colleagues of mine). You may find the name STA/LTA (short-term average/long-...
2
This depends a bit on what you want to get our of the analysis
Step 1: Instantaneous power
You square the signal. That changes the spectrum considerably. In particularly you need to watch out for aliasing. Let's say your signal is a 15kHz sine wave sampled at 48 kHz. If you square this you get one component at DC (0 Hz) and another at 30 kHz. However, the ...
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