Questions tagged [signal-processing]
The subfield of electrical engineering that focusses on analysing, modifying, and synthesizing signals such as sound, images, and scientific measurements.
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What's the formula of SNR (Signal to Noise Ratio) to dipole antenna array (eg, LOFAR) look like?
It was wellknown that the SNR of single dish telescope reads
$$s/n=\frac{P_s}{P_n}=\frac{P_{s}}{T_n}\sqrt{\frac{t}{B}},$$
where $P_s$ is the collected power, $T_n$ the noise temperature, $t$ the ...
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How to "classify" signals?
I have some signals and I want to classify them into different types. Signals are all sine shape signals, some might have glitches. I know I could classify them base on frequency or amplitude, but is ...
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Can you make a faraday cage intended to effect electrical wires?
Generally with a faraday cage your object is completely surrounded and encapsulated within the cage. Let's say I have a wire with electronic signals flowing through it, say an ethernet cable that is ...
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Sensor Array Position Calibration in Anisotropic Media
Problem.
I have a sensor array consisting of $n \gg 4$ receivers at unknown locations $\langle x_n, y_n, z_n\rangle$ embedded in an anisotropic medium whose index of refraction varies as a known ...
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An idea to retrive phase of different frequency from noisy experimental data
There is a lot of idea in this website to retrive phase of certain frequency from a noisy oscillation. For example this one: use band pass filter to filter out certain frequency and then use hilbert ...
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Pulse Area Uncertainty for a given Sample Rate and Bit Resolution
I'm recording pulses and want to approximately know how precise I can measure this with my Oscilloscope. I'm recording with 15 bit vertical resolution -> 1/(2^15) and a sample rate of 125 MS/s ->...
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Why the General Lomb-Scargle results are doubled?
I got a problem when computing the GLS on MATLAB for my master deegree thesis.
I need to do a comparison between the PSD and amplitude spectrum of a signal computed with three different metods, the ...
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Physical interpretation of FFT frequencies
I need to calculate the PSD of a discrete signal and want to compare it to other processes. By Nyquist theorem, I only can account half of the frequencies.
Assume I have a signal of length $N=100$, ...
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Converting PSD against spatial frequency to RMS against temporal frequency
I am putting together some simple ride comfort models that use road surface PSDs from ISO 8606 (road surface profiles) as inputs to a quarter car suspension model to produce body acceleration spectra. ...
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Is there any known result about the "average period" of a complicated oscillating function?
Say we have some frequency spectrum, $f(\omega)$, where
$$
f(t) = \frac{1}{2\pi} \int_{-\infty}^\infty d\omega \; f(\omega)e^{-i\omega t},
$$
and we know that $f(t)$ is some sort of ...
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During a wheelie, is there a braking effect on the back wheel of the scooter that is triggered physically when the bike is close to vertical?
When someone does a wheelie using a motorcycle (scooter), it looks to me like something is stopping the the motorcycle from tipping over backwards so far that it crashes. Is there some sort of (built ...
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Is it possible to use a distributed camera array to fake an interferometric sensor without phase data?
Astronomical interferometry is a technique which uses multiple small telescopes to mimic one giant telescope. It requires the phase of the light to be captured for it to work. It is widely used in ...
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How can the Fourier delta function produce different matrices in single-pixel imaging?
The pattern in the masks used for single-pixel imaging are created applying equation $(1)$,
$$P_\phi (x,y) = \frac{1}{2} \left[ 1 +| F^{-1} \{\delta_H (u,v) e^{i\phi}\}|\right], \tag{1}$$
in which the ...
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Fringe movement analysis to extract displacement
I am using a Michelson interferometer with the interferogram recorded on a CMOS sensor. I have taken a video of the fringes moving when a displacement of 50 $\mu m$ is imposed to one of the mirrors.
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Implement EPR Imaging deconvolution
I have bruker's EPRI data and I want to deconvolute it.
I read some article, that says
$$
f(r) = x(r) \circledast g(r) \\
F(ω) = X(ω) \times G(ω) \\
X(ω) = \frac{F(ω)}{G(ω)}
$$
$f(r)$: imaging spectre,...
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