Discrete fourier transform

Discussion in 'Homework Help' started by Cinek, Jan 24, 2009.

  1. Cinek

    Thread Starter Member

    Jan 11, 2009
    13
    1
    I am preparing for exam... and i stuck on one task...

    How we can calculate DFT of time function.... (e.g.
    x(t)= { =3 (for t=(-1,0) ; =1 (for t=(0,1) }.....


    up to now i thought DFt is only applicable in case of sequences only...
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Use the general formula for the Fourier transform:

    X(f)=integral of {x(t)*exp(-j2*pi*f*t) dt}

    For the first case evaluate the integral from -1 to 0 and set x(t)=3
    For the second case evaluate the integral from 0 to 1 and set x(t)=1
     
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