Point

Confusion in N of N-point-FFT

Confusion in N of N-point-FFT
  1. What is N in N point FFT?
  2. What is N in N point DFT?
  3. How do you find N in N point DFT?
  4. What is the complexity of for an N point fast Fourier transform?

What is N in N point FFT?

N is the number of points used to calculate the fft, it does not increase physical resolution but adds more point to the spectrum for more visual resolution, N is arbitrary.

What is N in N point DFT?

The length N of the DFT is the number of frequency points that will result in the DFT output. Zero padding will result in more frequency samples, however this does not increase frequency resolution, it just interpolates samples in the DTFT.

How do you find N in N point DFT?

DFT[x1(n) N x2(n)] = X1(k)X2(k) Where N indicates N-point circular convolution. Where N Indicates N-point circular convolution.

What is the complexity of for an N point fast Fourier transform?

If the sample size n is highly composite, meaning that it can be decomposed into many factors, then the complexity of the FFT is O(nlogn) O ( n log ⁡ . If n is in fact a power of 2 , then the complexity is O(nlog2n) O ( n log 2 ⁡ , where log2n ⁡ is the number of times n can be factored into two integers.

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