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What is the program that is used to speed the spectrum analysis process?

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What is the program that is used to speed the spectrum analysis process?

(a) DDFT

(b) FDFT

(c) FGPA

(d) Fast Fourier transforms

I have been asked this question in final exam.

This intriguing question originated from Digital Signal Processing topic in portion Digital Communication Techniques of Avionics

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The correct answer is (d) Fast Fourier transforms

Explanation: The DFT is a complex program that is long and time-consuming to run. In general, computers are not fast enough to perform DFT in real time as the signal occurs. Therefore, a special version of the algorithm has been developed to speed up the calculation. Known as the fast Fourier transform (FFT), it permits real-time signal spectrum analysis.

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