Large number of the applications such as filtering, correlation analysis, spectrum analysis require calculation of DFT.

**FAST FOURIER ALGORITHM (FFT)**

1. Large number of the applications
such as filtering, correlation analysis, spectrum analysis require calculation
of DFT. But direct computation of DFT require large number of computations and
hence processor remain busy. Hence special algorithms are developed to compute
DFT quickly called as Fast Fourier algorithms (FFT).

2. The radix-2 FFT algorithms are based on
divide and conquer approach. In this method, the N-point DFT is successively
decomposed into smaller DFT s. Because of this decomposition, the number of
computations are reduced.

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Digital Signal Processing : Frequency Transformations : Fast Fourier Algorithm (FFT) |

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