Plot the spectrum and n-point DFT

1. What is n-point in DFT?
2. How do you calculate N-point DFT?
3. How do you find the phase spectrum of DFT?
4. How do you find the N-point DFT in Matlab?

What is n-point in DFT?

Definition. An N-point DFT is expressed as the multiplication , where is the original input signal, is the N-by-N square DFT matrix, and. is the DFT of the signal.

How do you calculate 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.

How do you find the phase spectrum of DFT?

The graph of arg X(f) against frequency is known as the phase spectrum. From a real signal at a sampling rate F_s, the DFT provides N harmonic amplitudes at frequencies from 0 to . However the frequencies from 0 to F_s/2 are aliased to the region F_s/2 to F_s, so only the lower N/2 amplitudes are important.

How do you find the N-point DFT in Matlab?

A second argument to fft specifies a number of points n for the transform, representing DFT length: n = 512; y = fft(x,n); m = abs(y); p = unwrap(angle(y)); f = (0:length(y)-1)*100/length(y); subplot(2,1,1) plot(f,m) title('Magnitude') ax = gca; ax.