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IF you mean digital signal thats easy if you use microcontroller. Most external interrupts of MCUs can be configured to detect either on Rising or falling edge of a signal or you can poll a signal line in a loop. And can be even be switch back and forth as the program is running. Although the drawback here is you need to code plus teh latency in edge detection may be in the magnitude of microsecs which may not be acceptable in your application
Hi, I dont know what do you need it for and what kind of output you would like to see when there is an edge in the input. But if you do this:
pass the input I1 through a dff to get a signal I1_delayed, then xor I1 and I1_delayed to get edge_pulse, then edge_pulse will be a one clock pulse, produced whenever I1 makes a transition from 0->1 or 1->0.