question about Foureir transform in realty

Discussion in 'Physics' started by perchick, Jan 11, 2013.

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  1. perchick

    Thread Starter New Member

    Oct 24, 2012
    im not sure if its ok to ask this question here, especially since i've asked the same question in this homework forum but didn't get an answer, but ill give it a try and if its not OK i won't do it again :)
    the question is about the meaning of Foureir transform in realty. the Foureir transform for A*sin(2∏f1t) is 1/2j(δ(f-f1)-δ(f+f1)). this is 2 pulses in f1 and f2 with an amplitude of A/2. in realty we get 1 "pulse" in f1 frequency.
    i got this result in a lab (1 pulse, A amplitude) and im trying to explain it by Foureir transform (not Foureir series).

    1. how do i get from the original Foureir transform with 2 pulses to represent the actual result of 1 pulse? (something like Aδ(f-f1) will be fine)
    i need the amplitude in that frequency, not the energy or power.
    2. when using the Foureir transform for actual signals, how am i suppose to look at the result?
  2. Wendy


    Mar 24, 2008
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