All Questions
Tagged with signal-processing error-analysis
9
questions
2
votes
2
answers
52
views
How can I determine an error on total noise?
I am analyzing the data for an experiment, where we measured the total noise in a system. The total noise is defined as the variance of the signal (and is equal tot the integral over the noise ...
- 21
0
votes
0
answers
75
views
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 ...
- 1
0
votes
0
answers
43
views
FFT on a signal with a length that is not a multiple of the period of its harmonics
I was very surprised to find an apparent limitation to a FFT on a simple signal.
Let's consider a timeseries made of L=100 points, and simply composed of the sum of two sinus waves: one with a ...
- 127
1
vote
0
answers
27
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Is there a graphical summary of which modulation technique to use in communication systems using Visible Light Communication techniques?
I am currently looking at various papers written (some listed at the bottom) that discuss how laser pulses can be modulated to send encoded messages to a receiver for communication systems. The more I ...
- 221
1
vote
2
answers
515
views
Why does a photomultiplier tube (PMT) traditionally present better signal-to-noise ratio (SNR) than an avalanche photodiode (APD)?
Empirically, a photomultiplier tube (PMT) is said to present better signal-to-noise ratio (SNR) than an avalanche photodiode (APD). Some materials say that it is attributed to the higher gain and ...
- 11
0
votes
1
answer
103
views
How to solve this problem involving the "longest interval"?
The problem is shown as follows:
If one wants to make a digital record of sound such that no audible information is lost, what is the longest interval, $\Delta t$, between samples that could be ...
0
votes
0
answers
48
views
Measuring signal shorter than instrument response function
If one has a well-defined instrument response function (IRF) of some known full-width half maximum (FWHM), and they are measuring a signal that is shorter (but the shape is known), is it possible to ...
- 121
1
vote
1
answer
418
views
Determine Sample Size for Sensor Data
I'm trying to determine the bias on a gyro that is under constant motion. The way I've been doing this is sampling it over a long period (~1 minute at 100Hz) and taking the average. However, if there ...
- 111
1
vote
0
answers
62
views
Why can't we use the Neyman-Pearson likelihood ratio directly?
If you have a bunch of events and would like to choose a cut to distinguish background and signal, you can take the likelihood ratio
$$
\lambda(\vec x) = \frac{f(\vec x| s)}{f(\vec x| b)}
$$
and the ...
- 4,217