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The following butterfly diagram is used in the computation of __________

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The following butterfly diagram is used in the computation of __________

(a) Decimation-in-time FFT

(b) Decimation-in-frequency FFT

(c) All of the mentioned

(d) None of the mentioned

This question was posed to me by my college professor while I was bunking the class.

Enquiry is from Efficient Computation of DFT FFT Algorithms in division DFT Efficient Computation – Fast Fourier Transform Algorithms of Digital Signal Processing

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Best answer
Right option is (b) Decimation-in-frequency FFT

Best explanation: The above given diagram is the basic butterfly computation in the decimation-in-frequency FFT algorithm.

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