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3 votes

How signal generation affect its spectrum

The primary issue is not having enough interpolated samples in the DFT to properly estimate the desired Discrete Time Fourier Transform (DTFT) as a continuous function in the frequency domain. The ...
Dan Boschen's user avatar
  • 51.4k
2 votes

Why the Discrete time fourier series coefficients of a real discrete time periodic signal are not symmetric about y axis?

I believe the OP is confused about the middle graphic showing the DFT after using a command similar to fftshift in MATLAB, Octave and Python scipy.signal, which ...
Dan Boschen's user avatar
  • 51.4k
2 votes
Accepted

Is the magnitude spectrum of the Discrete Time Fourier Series of a Discrete Time periodic Signal , an even Function?

Just to get this out of the way: The DFT of a time sequence $x[n]$ is defined as $$X[k] = \sum_{n=0}^{N-1}x[n]e^{-j2\pi\frac{kn}{N}} \tag{1}$$ For the negative frequencies we get $$X[-k] = \sum_{n=0}^{...
Hilmar's user avatar
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2 votes
Accepted

Effects of Hanning window on power

When analyzing pure tones, you’d want to calculate the power spectrum, not the PSD. I’ll answer your question first, and give you the correct power spectrum computation second. Denote by $|X|^2$ the ...
Jdip's user avatar
  • 6,105
1 vote
Accepted

Trying to replicate results from tfestimate function in Matlab

I can confirm the following algorithm successfully replicates the tfestimate function for my signals $x(n)$ and $y(n)$, Algorithm Divide $x(k)$ and $y(k)$, where $k=0,1,\ldots,N-1$, into data ...
wolfiesax's user avatar
1 vote

Looking for an online course

I'm may be biased since I am the instructor, but I highly recommend the online course "DSP for Wireless Communications" which is offered routinely through dsprelated.com and the Boston ...
Dan Boschen's user avatar
  • 51.4k
1 vote
Accepted

What function can be used to describe periodicity of the signal

You are sampling, then resampling, then (essentially) filtering. Everything that you see can be explained because of the combination of these effects. You're starting with a signal at 100Hz: $x(t) = \...
TimWescott's user avatar
  • 12.7k

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