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Re:Fourier Transforms – The Math Trick Behind MP3s, JPEGs, a... by acjohnson55 on Wednesday November 06, 2013 @03:23PM (#6685237)
1) ...which when applied to a sampled signal, is the discrete-time Fourier transform (DTFT)

2.) It will only be periodic if there exist some frequency for which the frequencies of the sinusoids are integer multiple.

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