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FFT algorithm is designed to perform complex operations.

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FFT algorithm is designed to perform complex operations.

(a) True

(b) False

The question was asked during an internship interview.

This intriguing question originated from Applications of FFT Algorithms topic in division DFT Efficient Computation – Fast Fourier Transform Algorithms of Digital Signal Processing

1 Answer

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Right choice is (a) True

Explanation: The FFT algorithm is designed to perform complex multiplications and additions, even though the input data may be real valued. The basic reason for this is that the phase factors are complex and hence, after the first stage of the algorithm, all variables are basically complex valued.

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