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Please, give me intuitive understanding of this formula (http://en.wikipedia.org/wiki/Energy_%28signal_processing%29):

Signal x of t
So t is time, x(t) - signal function, integral is sum of this function on the whole x-axis, but:
why we need square ?
what does mean dt (why not dx) ?

olha
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    I answered a similar question here – Ben Grossmann May 04 '15 at 21:43
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    You might be used to having $ x $ be the input to the function we're integrating, like $\int f (x) dx $. But in this case $ x $ is the name of a function, and the input is $ t $. Hence $ dt $ rather than $ dx $. – littleO May 04 '15 at 21:50
  • @Omnomnomnom littleO: thanks, I've understood what dt is. And what is geometric interpretation of squaring signal function? – olha May 04 '15 at 21:55
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    what i wanted: http://math.stackexchange.com/a/7929/204563 – olha May 04 '15 at 21:59

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