6 votes

Resampling in frequency domain

Mirroring the spectrum would be trivial by multiplying with alternating +/-1, but since the OP mentioned in the comments under the question that it is to be done with resampling and filtering alone. A ...
  • 41.1k
3 votes
Accepted

How to be sure that we chose the correct sampling rate in pratice?

If the signal bandwidth is not known (and spectral characteristics in general) and test equipment such as a spectrum analyzer is not available, then my recommendation is to sample at the highest rate ...
  • 41.1k
3 votes

How to be sure that we chose the correct sampling rate in pratice?

Multiple options Theoretical analysis use fluid dynamics or mechanical analysis to roughly determine the frequency content of your signal. What are the main resonance mechanisms and what frequencies ...
  • 36.9k
3 votes
Accepted

Frequency constraints on a down-sampled signal

Yes, if "original frequency" refers to half of the original sampling rate, with caveats so let's review the main concepts. Assuming the resampling is done by upsampling (zero insert), ...
  • 41.1k
2 votes

Does power spectral density change with sampling rate?

If this is with regards to a measurement of sampled white noise with an FFT (let’s assume without further windowing where the resolution bandwidth is simply $f_s/N$), where there was proper ...
  • 41.1k
2 votes

Is square of signal more recoverable than signal itself?

Is square of signal more recoverable than signal itself? Generally no. The spectrum of $x^2(t)$ is the convolution of $X(\omega)$ with itself. This also means that if $x(t)$ has a bandwidth of B, $x^...
  • 36.9k
2 votes

Can we control the minimum of a continuous signal $x$ when some Fourier coefficients are constant?

Let's say $n=1$ and let's choose $\{a_k\} = \{ -1, 2, 1 \}$ with $\gamma = \pi$. Then using the exponential form of the Fourier series: $$ x(t) = \sum_{k=-N}^{+N} a_k e^{\jmath n t} $$ we get for our ...
  • 23.7k
2 votes

Oversampling and Aliasing

lets say I am sampling my signal (frequency is 70 Hz) by sampling frequency equals to 280 Hz (Nyquist*2) so, is there aliasing in frequency domain? It depends. If you have harmonics higher than ...
  • 129
2 votes

Representation of Sampling Frequency in the Fast Fourier transform

For a N sample FFT, the samples are distributed from DC (f=0) up to one sample less than the sampling rate. I have the plots below demonstrating this (the FFT is an algorithm that gives us the DFT or ...
  • 41.1k
2 votes
Accepted

Calculating sampling rate, sampling frequency

This is the way I look at it; the duration of a discrete-time signal is $N/f_s$. In your first example, with four samples, the duration is one second. Perhaps one intuitive way to see this is to ...
  • 14.1k
1 vote
Accepted

IQ Constelation Diagram of FSK signal

The OP is correct with the intuition that the IQ diagram for the FSK signal should remain on the unit circle. All forms of FSK are constant envelope signals, as we see clearly in the time domain plot ...
  • 41.1k

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