Questions tagged [signal-processing]
The subfield of electrical engineering that focusses on analysing, modifying, and synthesizing signals such as sound, images, and scientific measurements.
383
questions
0
votes
1
answer
398
views
Removing $1/f$ noise with lock-in-amplifiers
On the Wikipedia page for 1/f noise (at the bottom of the page) it suggests the noise can be reduced if the signal of interest is at DC. DC signals suffer from significant 1/f noise, so one method of ...
- 1,816
3
votes
1
answer
230
views
How fast, based on the laws of physics can the Internet be? [closed]
Assuming the actual physics, optics, signal processing and similar, how fast can we increase the 'speed' of the Internet?
I know the limit would be $$v \le c,$$ but are there some other limits:
...
- 4,747
2
votes
1
answer
171
views
Fourier transform of an exponentially decaying waveform
Consider an atom oscillating at a certain frequency. The amplitude of the oscillation decreases over time such that the waveform can be modeled by an exponential function, but the frequency remains ...
- 23
0
votes
2
answers
278
views
Drawing digital signal from analog signal
I was doing a question related to analogue to digital conversion. Here's the question,
Draw the digital signal corresponding to the analogue signal given below. Assume that the system has a bit rate ...
0
votes
1
answer
48
views
Physical validity of taking limits inside an integrand
Consider an integral expression for the spectrum, $$I(\omega)=\int_{-\infty}^{\infty}G(\omega,t)dt\tag{1}$$
with
$$G(\omega,t)=g(\omega,t)e^{t/\tau}.$$
Here $t$ is time, $\omega$ is frequency and $\...
- 155
1
vote
1
answer
47
views
Signal Generated from Transmitter [closed]
Suppose that we have a transmitter of $150.100\ \mathrm{ MHz}$.
We also have a receiver at a fixed point.
The transmitter constantly generates signals toward the direction of the receiver.
Based only ...
- 115
2
votes
1
answer
83
views
Which one is more precise: Phase locked loop or log the waveform then do sliding FFT?
I have an experimental confusion. I am using an interferometer to monitor the movement of a translation stage by monitoring the intensity of the coaxis interference pattern of the He-Ne laser.
...
- 357
0
votes
1
answer
49
views
Infer 3D location (Height, Latitude, Longitude) based on Signal Strength
Sorry if my question is irrelevant.
Let's consider two cases:
$1)$ Suppose that we have an Antenna and a tagged individual that can be pinged from the Antenna. Suppose that the individual is pinged ...
- 115
0
votes
1
answer
127
views
Capacitor microphones for recording studios
This question is formulated exclusively for high school students precisely to interest them in a more concrete way.
Condenser microphones are characterized by a capsule that functions exactly like an ...
- 2,547
0
votes
0
answers
37
views
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 ...
8
votes
1
answer
98
views
Once LIGO confirms a gravitational wave signal, can data from less sensitive detectors give more insight?
Only detectors above a certain sensitivity can measure with a high enough signal to noise ratio (SNR) to successfully pick out gravitational waves using matched filtering.
However, once we have ...
1
vote
1
answer
43
views
What is the relation between the frequency vector and the Nyquist frequency?
When trying to comprehend the concept of Nyquist frequency in FFT, I came across the following definition for half of the frequency range:
$$f = -f_{n}/2:df:f_{n}/2-1;$$
where $f$ represents the ...
- 753
2
votes
1
answer
381
views
Why can't you filter out the sound of running water using noise-cancelling software?
The book "Clint Emerson - 100 deadly skills", a fun illustrated book of spy techniques claims the following:
Deadly skill No 054, Civilian BLUF:
While noise-canceling software can override ...
- 143
1
vote
1
answer
77
views
Would increase the size of an antenna theoretically improve the ability to capture signals, if we allow changing the shape?
I have an argument with my friend about drone radio systems.
My assumption is this: the bigger the receiver the better reception is possible to achieve. The logic behind this is geometry: transmitter ...
- 111
5
votes
2
answers
808
views
Rope as Communication Media [closed]
I'm a computer student that used to play microcontroller and sensor. I'm not sure whether this topic fits on this site.
I'm thinking about using rope as media communication instead of fiber optic. I ...
