Problem

The butterfly in Figure P9.18 was taken from a decimation-in-time FFT with N = 16. Assum...

The butterfly in Figure P9.18 was taken from a decimation-in-time FFT with N = 16. Assume that the four stages of the signal flow graph are indexed by m = 1, . . . , 4. Which of the four stages have butterflies of this form?

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