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
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    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

    Moderator

    Mar 24, 2008
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