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how to detect 2nd crossing of a signal
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How can i detect the 2nd crossing of signal if it reaches 20.
![Screen Shot 2019-02-23 at 21.09.33.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/205492/Screen%20Shot%202019-02-23%20at%2021.09.33.png)
signal characteristics
![Screen Shot 2019-02-23 at 21.01.40.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/205493/Screen%20Shot%202019-02-23%20at%2021.01.40.png)
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