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Discrete Fourier Transform

: Signal ProcessingDiscrete Fourier Transform Discrete Fourier Transform (DFT) Relations to Discrete -Time Fourier Transform (DTFT) Relations to Discrete -Time Fourier Series (DTFS)October 19, 2021 Yet Another Fourier RepresentationWhy do we need another Fourier Representation? Fourier seriesrepresent signals as sums of sinusoids. They provide insightsthat are not obvious from time representations, but Fourier series onlydefined for periodic [k] = n= N x[n]e j2 kn/N(summed over a period) Fourier transformshave no periodicity constaint:X( ) = n= x[n]e j n(summed over all samplesn)but are functions of continuous domain ( ).

the step discontinuity at n= 64. Two Ways to Think About the DFT Compare to DTFS: 1. The DFT of a signal x[n]is equal to the DTFS of a version of that is periodically extended so that it …

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sigproc.mit.edu

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