Fourier Transforms Revisited

• a signal as a function of time, s(t), can be transformed into a function of frequency, S(f)

• either s(t) or S(f) completely specify a signal:

  amplitude of signal at any time (time domain)
  
  constituent frequencies (frequency domain)

S(f) = s(t) e-j2öft dt

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s(t) = S(f) e+j2öft dt

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where j2 = -1

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