Questions tagged [signal-theory]
Anything related to signal theory, i.e. the branch of applied mathematics and engineering studying the properties of signals and the mathematical tools used to manipulate them.
157 questions
1 vote
3 answers
123 views
Active and reactive power in loudspeakers
I'm studying active and reactive power, and got to this question: A loudspeaker, let's say the one from a guitar amplifier, receives an AC signal in order to sound, but usually it is said that DC is ...
4 votes
0 answers
88 views
Uncertainty principles and signal recovery (Donoho and Stark)
I am trying to reconstruct a signal that has missing samples using the methods proved in the title paper. The paper is readily available (https://web.stanford.edu/dept/statistics/cgi-bin/donoho/wp-...
- 141
0 votes
1 answer
118 views
Finding the Impulse Response of an LTI System
Source: Signals and Systems, Oppenheim, et al., page 152, 2nd edition.$$\\$$ Here is what I've figured: $$x'(t) = 2(-3e^{-3t}u(t-1)+e^{-3t}u'(t-1))\\ =-3x(t)+e^{-3t}\delta(t-1) $$ Now, since this is a ...
1 vote
1 answer
70 views
What is the difference in significance of using complex representation in signal processing and communication(transmission)?
I got to know that in signal processing we use \$j\$ to represent a phase of \$\pi/2\$ in between two real signals which are being transmitted. This also conforms to the fact that to find signal ...
- 39
1 vote
1 answer
64 views
expected dwell time
I am trying to calculate the dwell time of a mobile user in a UAV coverage. So if \$x_\text{start}\$ and \$y_\text{start}\$ are the initial positions and \$x_\text{end}\$ and \$y_\text{end}\$ are the ...
- 11
2 votes
1 answer
160 views
Unusual answer for signals & systems problem [closed]
I'm stuck at part d) of the problem. While my solution for the output signal after simplified is: \$y[n] = u[n] + u[n-2]\$, the provided answer: \$y[n] = 2u[n] - \delta[n] - \delta[n - 1]\$ with \$\...
2 votes
2 answers
89 views
Processing data from optical chopper to correct for drift
I have a time series measurement of light intensity where the signal is periodically blocked by hardware to provide a moving baseline to correct for drift. This looks like a square wave, where the ...
- 21
0 votes
2 answers
62 views
How can I infer a circuit topology only from measuring/controlling its input and output?
Let's have a circuit only composed of resistors connected in a given topology. This topology (network) has a well defined boundary (input/output connectors) but otherwise we don't know how it is ...
2 votes
3 answers
230 views
Signal diode to protect high speed data lines
I don't understand this. Could someone explain this to me? I have a hard time imagining how it works. Why would the signal line be protected by connecting the diodes this way? If you get an ESD event ...
- 51
4 votes
1 answer
296 views
What is the term for a code that has duplicate or redundant/equivalent symbols?
I'm having a hard time performing a literature search because I can't find the right search terms. I'm looking for what you name a code over some alphabet that treats multiple symbols equivalently. E....
- 247
0 votes
1 answer
114 views
How To calculate RSSI parameters in 3G and LTE
I'm working on how to determine the distance using RSSI through LTE and 3G network, but I'm having a problem how to calculate the RSSI at a certain distance
0 votes
0 answers
145 views
How to properly take the discrete Fourier transform of a signal as well as calculate the power spectral density of the DFT?
I'm getting conflicting answers on how to properly represent a DFT and normalize the results as well as calculate the normalized PSD of the time series. For background, I typically work with voltage ...
- 1
0 votes
1 answer
198 views
Need help on signals and systems, Fourier representation of a signal
I've got a homework question for my signals and systems class. In the question, we're given the graph of the magnitude and the phase of a continuous signal. Here are the graphs: I have to find the ...
- 1
1 vote
1 answer
103 views
Attenuation and capacity
Does attenuation affect capacity for multiple narrowband signals? For example, assume there exists a 20 MHz channel with two 10 MHz subchannels. The first subchannel has frequency response 2 and the ...
- 11
0 votes
0 answers
145 views
Signal path between nodes in a MoCA network
I'm trying to understand how signals propagate between nodes in a MoCA (Multimedia over Coax Alliance) network. For example, in a typical but simple network, one has a coax input from a service ...
- 121