Local max detection in data stream

Hey peoplz!
iam looking for a way to better find the peaks in my datastream, see in the image below.
Screen Shot 2018-10-28 at 10.31.08.png
I tried a lot of different things, a friend sad i have to do a “three point running window” but i have no idea. maybe you got some ideas? Its all about the big changes in the data, then i will generate a bang to drive an animation.

Look at the kind of things that are done in MotionDetector here:

viewtopic.php?f=22&t=1092&p=29533&hilit=motion+detector#p29533

dear @greg, thank you for the link! i will check it out,
i got really close with a combination of envelope, filter and slope nodes.
Screen Shot 2018-10-28 at 22.38.39.png