Do CQT, FFT, and NNLS provide different perspectives on the original signal?

1. What is the difference between DIF FFT and DIT FFT?
2. What is the advantage of FFT over DFT?
3. What is the main advantage of FFT?
4. Why is FFT used in signal processing?

What is the difference between DIF FFT and DIT FFT?

In DITFFT, input is bit reversed while the output is in natural order, whereas in DIFFFT, input is in natural order while the output is in bit reversal order. DITFFT refers to reducing samples in time domain, whereas DIFFFT refers to reducing samples in frequency domain.

What is the advantage of FFT over DFT?

For a sample set of 1024 values, the FFT is 102.4 times faster than the discrete Fourier transform (DFT). The basis for this remarkable speed advantage is the `bit-reversal' scheme of the Cooley-Tukey algorithm. Eliminating the burden of `degeneracy' by this means is readily understood using vector graphics.

What is the main advantage of FFT?

The main advantage of an FFT is speed, which it gets by decreasing the number of calculations needed to analyze a waveform.

Why is FFT used in signal processing?

It converts a signal into individual spectral components and thereby provides frequency information about the signal. FFTs are used for fault analysis, quality control, and condition monitoring of machines or systems.