# Tag Info

### Phase extraction from Fourier transform

You need to evaluate the DFT at the frequency of the input signal. I recommend doing this experiment with the DTFT instead of the DFT. You can implement it in just a few lines of code, and unless the ...
• 13.5k

### FFT of a gaussian signal in Python

There are two issues: The time axis is not long enough to capture a sufficient length of the Gaussian. The FFT is not properly scaled. For the first item mentioned regarding the time axis, the ...
• 36k

### Can anyone explain how dft works as a filter bank?

To add to Richard's good answer, I specifically want to show the difference between: Down-conversion and low-pass filtering (heterodyne the signal). Bandpass filtering the signal directly (...
• 36k
Accepted

### Can anyone explain how dft works as a filter bank?

@Ahmet. The DFT equation you posted does not compute an array of complex numbers. For any single given integer value of frequency-domain index $k$ the equation tells us how to compute the single ...
• 4,555
1 vote

### Bandwidth visualization in frequency domain

As a complement to Dan's answer: don't think in terms of the bandwidth per sample; this concept makes no sense. I recommend studying the discrete-time Fourier transform (DTFT) before the DFT. If you ...
• 13.5k
1 vote
Accepted

• 21.7k