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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Why don't you always use a high sampling rate?
I was just curious, as I was reading about aliasing.
As far as I understand, aliasing comes from the fact, that you use a bad sampling rate, resulting in getting a wrong waveform compared to the one ...
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Continuous Fourier transform vs. Discrete Fourier transform
Continuous Fourier transform vs. Discrete Fourier transform. Can anyone tell me what the difference is physics-wise? I know the mathematical way to do both, but when do you use the other instead of ...
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Is there any way to find difference between two same sounds of different people? [closed]
I am trying to understand and find a way to distinguish two same sounds of different people by some physics formula, so could you guys help me?
OK I'll try to explain my question in this way that, ...
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What does a constant signal sound like?
Say I was sampling a sound incorrectly and it produced a constant signal as below:
What would this signal sound like? In Matlab, it plays nothing. Is this correct?
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Calculating decibel gain and loss
I'm doing a mobile/wireless networking subject and the physics aspect is giving me some trouble. I'm mainly confused about the conversion of dB, dBm and dBW and how to calculate the gain/loss from an ...
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Fourier transform with periodicity at the harmonic frequency
Let's suppose I have a signal $F(t)$ that is periodic, with two periodicities $P_1$ and $P_2$, with $P_1 > P_2$. Suppose that I know the values of the two periodicities.
Using the Fast Fourier ...
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Why can't you hear music well over a telephone line?
Why can't you hear music well well over a telephone line?
I was asked this question in an interview for a university study placement and I unfortunately had no idea.
I was given the hint that the ...
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Application of wavelets in computational electromagnetics
I am a first-year graduate student (electrical eng.); wavelets is one of the courses that I am taking presently. As part of the course, I plan to explore application of wavelets in computational ...
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Representation of a Signal and its evolution via Quantum System
I am a total beginner in the field of Quantum Mechanics. So, the question I am asking may be a silly one. So kindly give me possible answers or advice for modifications.
Recently I am learning the ...
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Can atmospheric pressure literally push electromagnetic waves?
I work for an IT company and some time ago we had an issue with our wireless internet. We are 5 miles away from the ISP's antenna. Our Sys Admin expressed the view that the electromagnetic waves are ...
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Compare Dynamics of Cosmic Ray Neutron Radiation
Examining cosmic ray neutron radiation near ground by neutron monitors for example (http://www.nmdb.eu), different stations show similar dynamics in the signal.
At one station, I like to "substract" ...
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Frequency shift without affecting signal length
Non-physicist here.
From what I've learned in university and what common sense says, a shift in frequency of a signal results in a change in its length in time. For example, if a sinusoid signal of ...
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What is a Nyquist edge?
I've come to this sentence and I don't understand the term Nyquist edge.
Because observing in the FM band is not feasible, a sampling frequency of 200 MHz has been chosen for most of the receiver ...
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3D Surface Related Multiple Elmination (SRME)
Let's assume we are looking at first order multiples of the same surface (i.e no peg leg, etc). I am looking at marine 3D SRME and I am a little confused as to how this works. I understand that in the ...
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Image K-Space and SNR
I am imaging a sample using CMOS camera. The pixel ratio is 6um x 6um and a total resolution {480, 752}. I understand that each pixel on the camera sensor is 6um x 6um in size (Have I understood this ...
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