Quote:
Originally Posted by TonyDuell
Except that's not a differentiator, is it? It may well detect the edges of a square wave, but I don't think it would turn a triangular wave into a square wave, or anything like that.
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The mathematical function is not exactly the same, but it serves the same purpose, for many applications, producing a signal that is dependent on the input signal's rate change, but without the noise issues. In most cases that is what you want a differentiator to do, to give an output which increases with the rate of change of the input signal, or detect a transient of some kind on the incoming waveform and ignore slowly changing signals.