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Intuitive example of how the Fourier Transform relates time domain signals to their frequency domain representation.
* I should have mentioned that the definition of the Fourier transform of periodic signals includes a factor of 2pi. So the amplitude of the bottom graph is 2pi times the coefficient of the respective cos wave. For example, the "zero frequency" (DC offset) component of 1/2, is indicated on the bottom graph by the amplitude 2pi x 1/2 = pi = 3.14159...
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