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fourier transform derivation

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beri

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hi everybody ,
i'd like to ask a question about derivation of fourier transform . when we derive fourier transform from fourier series why we use envelope function (T ak) what is the exact reason of this and what is envelope exactly
thanks
 

beri said:
what is envelope exactly
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The envelope function is a model of the signal that you are properly working, let´s say, the subject of interest. In time domain would represent the shape bounds of the amplitude of that signal, but in frequency domain I´m not sure if there exists the same graphical meaning.
 

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