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The fast Fourier transform is an efficient algorithm to compute the discrete Fourier transform (DFT) and its inverse.

I just got a thought when generating matrices , plotting it and taking its FFT, Lets say, I have randomly input a matrix of length 256, [1 7 9 5 7 1 -2 0..................8] According to the FFT, the … resulting 256 FFT coefficients correspond to the following frequencies: 0, $f_s/256$, $2 f_s/256$, $3 f_s/256$, $\ldots$, $255 f_s/256$ but since the samples i taken has no sampling frequency defined …
asked Oct 21 '12 by Sufiyan Ghori
After getting suggestion to first study FFT on square wave to understand FFT of discrete signal, I'm trying to understand the FFT of square wave. … x=square(2*pi*f*n); subplot(2,1 ,1) stem(n,x) Output wave, Now plotting its FFT subplot(2,1 ,2) F=fft(x) plot(2*abs(F). …
asked Oct 21 '12 by Sufiyan Ghori
I plotted a simple Cosine wave and After taking its FFT the frequency can be seen easily but after modifying the original signal to add more lower and higher frequencies, the higher ones are visible but … the original signal and supposed to be plotted at point 5 of the FFt. …
asked Oct 21 '12 by Sufiyan Ghori
When we plot FFT in a matlab it doesn't ask for Frequency , all we need to input the sequence and it simply shows the output using stem command. … Here is simple code for the FFT calculation , x=[1 2 1 0] n=0:3 y=fft(x) subplot(2,2,1) stem(n,y) …
asked Aug 29 '12 by Sufiyan Ghori
Even i had confusion differentiating between these two terms at the beginning , have a look at this explanation from one of the Award winning DSP books. Amplitudes, Magnitudes,
answered Mar 21 '13 by Sufiyan Ghori
In case of 1-D FFT it is far more easier to find number of harmonics and their Respective frequencies and amplitudes. …
asked Sep 30 '12 by Sufiyan Ghori
8.0000 -4.0000 + 4.0000i 0 -4.0000 - 4.0000i If i calculate the fft instead of fft2 it will give the following output %FFT -> DFT of Vector %FFT2 -> DFT of Matrix 0 …
asked Sep 25 '12 by Sufiyan Ghori