# Difference Between FFT And DFT

In the field of signal processing, the Fast Fourier Transform (FFT) and Discrete Fourier Transform (DFT) are two of the most important algorithms. Though both algorithms are used to calculate the discrete Fourier transform of a signal, there is a major difference between them. The FFT is much faster than the DFT, but it requires more memory. The DFT is slower, but it doesn’t require as much memory.

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## What is FFT ?

Fast Fourier Transform (FFT) is an efficient way to compute the Discrete Fourier Transform (DFT). The FFT is a computation of the DFT that reduces the number of operations from O(N2) to O(N log N). FFT can be used to improve the performance of many applications, including signal processing, image processing, and data compression.

## What is DFT?

DFT is an acronym for “Discrete Fourier Transform”. It is a mathematical transformation that converts a signal from the time domain into the frequency domain. The DFT has many applications in signal processing and data analysis.

The DFT can be used to determine the frequencies that make up a signal. This information can be used to improve the quality of the signal or to remove unwanted frequencies. The DFT can also be used to compress signals, by reducing the number of samples needed to represent the signal accurately.

The DFT is a powerful tool that can be used to analyze and process signals. It is important to understand how it works in order to take full advantage of its capabilities.

## Main differences between FFT and DFT

In mathematics, the discrete Fourier transform (DFT) is a certain kind of finite Fourier transform. It is used in signal processing and related fields as a tool to calculate the discrete-time Fourier transform (DTFT), which is a periodic function of frequency. The DFT has many applications in science and engineering, from solving partial differential equations and systems of linear equations, to algorithms for fast multiplication of large integers.

The Fast Fourier Transform (FFT) is an optimized version of the Discrete Fourier Transform (DFT). The FFT is much faster than the DFT, because it exploits symmetries in the DTFT to reduce the number of computations. The FFT is used in many applications, such as digital signal processing, image processing, acoustics analysis, radar and astronomy.

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In conclusion,the main difference between FFT and DFT is that FFT is faster than DFT. This is because FFT can be implemented in hardware while DFT cannot. FFT is also more accurate than DFT because it uses less data.