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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