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Math Help - inverse discrete fourier transform

  1. #1
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    inverse discrete fourier transform

    I need help with the following problem:

    Let Fk = [ 1, 1, -j, 0, 0, 0, j, -j, 1, 0] which is the DFT of f[n]

    Determine f[n]

    I'm using the equation f[n] = (1/2pi) * int(0 to 2pi) {FK * exp(j*omega*n d(omega)}
    I keep getting zero for each value. I'm pretty sure that's wrong. Is this equation correct? If not, what equation should I use? Any help would be appreciated.

    Is the inverse of 1 2pi * dirac[n]?
    What is the inverse of j? -j?

    Thanks
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by afried01 View Post
    I need help with the following problem:

    Let Fk = [ 1, 1, -j, 0, 0, 0, j, -j, 1, 0] which is the DFT of f[n]

    Determine f[n]

    I'm using the equation f[n] = (1/2pi) * int(0 to 2pi) {FK * exp(j*omega*n d(omega)}
    I keep getting zero for each value. I'm pretty sure that's wrong. Is this equation correct? If not, what equation should I use? Any help would be appreciated.

    Is the inverse of 1 2pi * dirac[n]?
    What is the inverse of j? -j?

    Thanks
    You are confusing the DFT with fourier series, see the link in the other thread for the forward and backward DFT.

    CB
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