The subfield of electrical engineering that focusses on analysing, modifying, and synthesizing signals such as sound, images, and scientific measurements.
Questions tagged [signal-processing]
371 questions
4
votes
3 answers
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 you had from the beginning.
So why is it you just…
Denver Dang
- 2,517
3
votes
2 answers
How to find gain bandwidth with knowledge of source bandwidth and output bandwidth? Deconvolution?
Say, I'm amplifying a signal using a device with gain bandwidth, ΔG Hz, which is unknown.
My source signal which is being amplified is known to have a bandwidth of X Hz, and the amplified output signal has a measured bandwidth of Y Hz.
Is it…
Wostwl
- 125
- 1
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3
votes
1 answer
Frequency of a periodic signal with distortions
I would like to evaluate frequency of some unstable periodic signal coming from a detector:
The signal is registered continuously and may or may not be present (i.e. be periodic). The frequency and amplitude of the periodic signal can change but…
Andy
- 131
2
votes
1 answer
How are sampled signals reconstructed to original?
Recently I've read an article and watched a video by Monty Montgomery, where he's dealing with the so-called "staircases" in sampled signals.
He clearly demonstrated that a signal within Nyquist bandwidth is perfectly reconstructed to its original…
PF4Public
- 121
2
votes
0 answers
How do you characterize choppiness of a signal?
I have two sets of signals. This is how they look
Signal 1
Signal 2
It seems just by observing them that Signal 1 is a little more choppy (fluctuating) that Signal 2. But I want to be sure. Can someone suggest a mathematical way by which I could…
Black Dagger
- 1,283
1
vote
1 answer
Why doesn't channel capacity approach the unity function as S/N rises?
Let's look at Wikipedia example of applying Shannon–Hartley theorem to an additive white Gaussian noise (AWGN) channel with B Hz bandwidth and signal-to-noise ratio S/N.
$$
C = B \log_2 \left( 1+\frac{S}{N} \right)\
$$
where C is the channel…
SF.
- 2,988
1
vote
0 answers
Why square wave-form output is higher than a sin or a triangle wave-form output?
I'm working on a digital audio synthesiser and I'm facing out an issue about the amplitude level.
I'have a sinusoid signal which have a max amplitude of $-1 / +1$ and a square signal which have a max amplitude of $-1 / +1$ too.
My problem is about…
François Legrand
- 111
1
vote
4 answers
Is there any concept of speed in analog transmission?
In digital data transmission, the speed is measured in bits per second. 1) Is there any concept of speed in analog data transmission? 2) Shannon Hartley theorem limits the speed achieved in digital data communications. Is there any equivalent of the…
akm
- 265
1
vote
0 answers
Linear transformation of real and analytic signal
Suppose you have one real-valued signal $s(t)$ and another the real-valued signal $r(t)$ related to $s(t)$ by a linear integral transformation with a real kernel $k$ such that $r(t) = \int dt'\, k(t-t') s(t')$. The kernel depends on particulars of…
ThomasS
- 84
0
votes
1 answer
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. These are then weighted according to ISO 2631…
0
votes
1 answer
Phase difference of two time series
Consider we have two time series and for each of them , we know the phase (Phase1 and Phase2). We want to compute phase difference between these two time series. We define the phase difference as (Phase1 - Phase2) and we wrap the results to the…
Aep
- 1
0
votes
1 answer
What exactly is the output impedance in this circuit, and why must it be low?
I'm currently considering this circuit:
Which is really just two RL filters added together. A single RL-filter looks like this:
I want to be able to multiply the transfer functions of the left and right circuit to be determine the net transfer…
Heatherfield
- 370
0
votes
1 answer
Can a gaussian pulse be a pure tone?
I was given a signal dataset, and I was told it is a gaussian pulse and a pure tone. I am unsure how this is related as when I read about this two terms, there are differences in them. so can a gaussian pulse be a pure tone too?
hphys
- 1
0
votes
1 answer
What corresponds physically 'data packet' typical of an internet network?
We always talk about packets, data packets, but physically, if they are transmitted through the fiber and wireless technology solutions, what kind of signals are, how they are made? Square waves?
Peter Long
- 21
0
votes
2 answers
Calculate energy of a signal
I have trouble with calculating the Energy of the following simple signal
$x(t) = e^\left(j\left(t+\pi/2\right)\right)$
Shouldn't it have $A=1=|x(t)|$, So
$$E_{x}=\lim_{T\to\infty}\int_{-T/2}^{T/2}|x(t)|^2dt =…
