How to detect a specific period of a square wave?

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Joha Alkq
Joha Alkq 2015-10-10
编辑： Joha Alkq 2015-10-10
Dear all,
I have a square wave signal that's obtained from Simulink. By referring to square wave's graph attached, I need to detect if amplitude of the square wave is being "1" for along time. In other word, I want to detect the period a-b, as shown in graph.
Any idea?
Thanks in advance.

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