Questions tagged [signal-analysis]
The processing of signals for the purpose of extracting a parameter or property embedded in a signal. Signal goes in and far fewer numbers come out.
2,190
questions
0
votes
0
answers
32
views
Why does my range shift after applying Stolt interpolation?
I am working with an FMCW Radar Simulation, where I have generated 3 targets with slant ranges: 156m,137m 118m
The distances can be computed based on the formula,
Distance = (Bin_idx/Nrg * Fs) * (c / ...
- 93
0
votes
0
answers
19
views
Is this signal an FRI (finite rate of innovation) signal?
I am trying to model the subsurface as a randomly layered medium, with stochastic acoustic attentuation that gives rise to a reflected waveform from an active source as the following signal:
$$
x(t) = ...
- 133
0
votes
1
answer
62
views
Hilbert transform with non-modulated signals
Is it correct to compute the Hilbert Transform and then the complex envelope, expressed as $v = z~ e^{-j 2\pi f_c t}$, where $z$ represents the analytic signal and $f_c$ represents the carrier ...
- 13
0
votes
0
answers
48
views
Understanding the modulation concept
In my research work, I came across the concept in the paper
Y. Hu, P. Wang, Z. Lin, M. Ding and Y. -C. Liang, "Machine Learning Based Signal Detection for Ambient Backscatter Communications,"...
- 71
1
vote
1
answer
223
views
Check whether signal is periodic
I have a signal with multiple frequencies. The frequency changes depending on the amount of air flowing through the fuel snap. The signal resembles a square wave ranging from $0.4$ to $4.5$ Volts and ...
- 13
1
vote
1
answer
270
views
Plotting a Manually made Spectrogram with python
I'm following a guide about signal processing, but since I'm a fresher to the domain, the guide just stops at a point where only a function that could return the spectrogram values is written. So, my ...
- 11
0
votes
2
answers
95
views
Calculating DC from signal avg or rms value required?
If we want to calculate a dc value of any given signal, should the dc value be RMS or average value?
1
vote
2
answers
218
views
How to use MUltiple SIgnal Classification (MUSIC) algorithm to detect the wavenumber of a received signal at array of sensors?
I am working on analyzing data obtained from Fiber Optic - Distributed Acoustic Sensor (DAS) to estimate the properties of acoustic waves that impinge FO cable, such as velocity of acoustic waves. FO-...
- 153
0
votes
2
answers
71
views
What is DC gain of sine wave multiple?
I am testing about injection sine wave current to r,c impedance and measurement R + jX see fig.1 .
When scope is Va .
When sine wave multiple (Va*Vb).
I put average to find DC of this signal.Is ...
0
votes
0
answers
49
views
What should be a sensible range for the various librosa parameters to extract features from a very high sample rate (2MHz) audio signal?
I am trying to implement a deep learning classification solution for (1 second long) audio signals recorded at a very high sample rate, i.e. 2 MHz. All the material and tutorials that I could find ...
- 1
0
votes
0
answers
37
views
Observing Artefacts along azimuth direction after applying RMA to FMCW radar data
I have simulated 3 scatterers for FMCW radar signal processing using Range Migration Algorithm.
Background:
The Range Migration algorithm steps are as follows:
Applying Azimuth FFT on the raw data
...
- 93
0
votes
1
answer
194
views
MUltiple SIgnal Classification (MUSIC) for Frequency Estimation
I am trying to use MUSIC algorithm to detect individual frequencies of an incident signal. I read the original paper and some interesting books that explain the algorithm. I used the following ...
- 153
0
votes
1
answer
55
views
Any alternative implementations for (overlapping) Allan deviation calculation than "allantools"?
We have the need to calculate the overlapping Allan deviation on possibly some billion data points (for long-running measurements). While alantools.oadev() is ...
0
votes
2
answers
67
views
Synthetic Aperture Radar model: Ground reflected energy
My question is related to a theoretical part of the book: Digital Processing of Synthetic Aperture Radar Data, Algorithms and Implementation by I.G. Cumming et al. [Chapter 4. Equation 4.25 (for those ...
- 65
0
votes
0
answers
30
views
What are common pre-processing steps of EEG signals
I am new to EEG analysis, and I wonder what are the common pre-processing steps of EEG signals, for example, for motor imagery classification?
Currently, my pre-processing steps include
Epoch the ...
- 120
0
votes
1
answer
41
views
Comparing methods of blind source separation
I am currently working on blind source separation using sparse hypotheses and convolutive mixtures. For my project, I have compared three different methods and calculated the Signal-to-Distortion ...
- 43
0
votes
1
answer
74
views
Pitch tracking and phase
I wish to control a simple pitch tracker using my voice. So far I have experimented with fft and yin. I am extracting the frequency and amplitude in real time. I then feed these into:
...
- 275
2
votes
0
answers
179
views
MUSIC Algorithm for 2D Power Spectrum
I am trying to use Frequency-wavenumber analysis for estimating speed of sound using two-dimensional data obtained via channel of arrays. The traditional technique is to use FFT to transform the data ...
- 153
1
vote
3
answers
99
views
How to separate Transient and Steady-State Expression from Periodic Summation Response?
Background
My question comes from here, it's a response of 1st order LPF RC circuit from an arbitrary periodic input.
How to determine the transient response of a circuit to causal periodic inputs?
...
- 177
0
votes
1
answer
175
views
How to calculate phase rotation of I/Q reference samples for Bluetooth Angle of Arrival
I am trying to compensate phase rotation due to carrier frequency offset (CFO) for Bluetooth Low energy (BLE) Angle of Arrival (AoA). In BLE AoA the adv. packets carry a Constante tone extension @...
- 5
0
votes
1
answer
40
views
Trimming of Azimuth Frequency Extent After Stolt Interpolation
The space-variant impulse response can be circumvented by collecting SAR data over a larger angular aperture than is strictly needed to achieve the desired azimuth resolution. From Carrara's text, it ...
- 93
1
vote
0
answers
32
views
Filter choice for the signal with the possible time jitter in sampling and frequency aliasing
I'm trying to filter data from the force sensor mounted on the end effector of the industrial robot arm. Mechanical vibration caused by the robot's motion (possibly by actuators, reductors, etc.) ...
3
votes
2
answers
140
views
FMCW Radar timing of transmission and reception
I have a question regarding the implementation of FMCW radars that seems rather basic to me, but for some reason I am a bit unclear about this.
So I understand that in FMCW radar, transmitter and ...
- 65
2
votes
2
answers
112
views
How would you compute Fourier transform of a real world signal where the signal keeps getting updated (not a static one)?
Crossposted at Electrical Engineering SE
A very naive question: How do we use Fourier transform for real world signals - for which you have the information only up to the present instant (and the ...
- 153
3
votes
1
answer
143
views
How to detect decrease of a digital signal?
I have below given digital signal (sampled with period $T = 1\,\mathrm{ms}$)
for which I need to evaluate its decrese. Namely I am interested in regions where the signal decreases faster than $-1000\,\...
- 375
0
votes
0
answers
85
views
How to draw a phase diagram in MATLAB (picture attached) for 3 variables (x, y and mean squared error)?
I am trying to make a phase diagram for three variables .
a=[0.01 0.5 1 1.5 2]; b=[0.1 1 2 5 10];
and their mean squared error value in variable 3 (having 5 rows and 5 columns)
mse =
...
- 87
1
vote
1
answer
60
views
Time of arrival
The definition for the time of arrival is:
$TOA=\frac{d}{c}+t_e$ where $c$ the wave speed, $d$ the range between the transmitter and the receiver and $t_e$ the transmission time of the signal to the ...
- 11
0
votes
0
answers
22
views
Model validation- comparing signals
Let's say I am trying to validate a model. I have a signal from measurement and a signal from the simulation of the model. Simulation was done with the same initial and boundary conditions as ...
0
votes
1
answer
44
views
Displaying and analyzing an audio file in MATLAB
I was given the following problem at my university:
We are given an audio file which we have to download. Following that we have to create a MATLAB code that can create a discrete-time graph of the ...
-3
votes
1
answer
160
views
0
votes
0
answers
15
views
Need help to calculate phase velocity in subsequent echoes
I have the response signal of a piezoeletric transducer. I'm trying to acquire the phase velocity of the echoes I'm receiving. The resonancy frequency of the transducer is 5 MHz. I'm using an ...
1
vote
3
answers
198
views
How to estimate the local trend in a signal?
I need to remove trend from my time-series which looks like the following images.
However, I want to estimate the trend before removing it. Hence directly removing it won't do it.
The simple ...
- 357
0
votes
1
answer
73
views
How to calculate the bandwidth of a continuous signal in an interval?
I am struggling with a task I thought would be a good exercise. I am tasked with calculating the bandwidth of the equation below and I'm struggling. I managed to find and understand why $\text{sinc}(t)...
1
vote
1
answer
110
views
Impulse response of linear time-varying system
I am confused about linear time-varying system. For a time varying system, the output is given by
\begin{align}
y(t)=\int x(\tau) h_{\tau}(t) d\tau,
\end{align}
where $ h_{\tau}(t)$ is the output of ...
- 113
0
votes
0
answers
43
views
Sharp spikes in unknown signal [duplicate]
I am trying to decode an unknown signal, which has those really weird spikes/jumps.
My assumption is that it is somehow (B)PSK modulated but the signal looks really odd as shown in the screenshot. The ...
1
vote
0
answers
94
views
The correct way to perform signal processing on S-parameter data
I have a question to ask you which has been bugging me as of late.
I have s-parameter data with 5001 samples acquired from a vector network analyzer. I am trying to 'gate' this s parameter data, i.e. ...
- 41
0
votes
0
answers
69
views
The distribution of peak and rms of response in time domain
I am trying to model the pdf of the peak and rms of the time domain response $y(t)$ in a reverberation chamber. The system is stimulated by pulsed linear chirp $x(t)$ for 200 ns that goes linearly ...
- 91
3
votes
1
answer
195
views
Fourier transform of a time discrete signal
I would like some help to better understand the Fourier transform of a discrete time signal. My doubts are:
The sampling of a signal can be seen as $x_s(t)=x(t) \cdot
\sum_{k=-\infty}^{+\infty} \...
- 75
1
vote
1
answer
86
views
Impulse response of a discrete time cascading system
My lecturer has decided that in order to pass our signal analysis class, we have to give a presentation on the blackboard in front of the entire class, so its kinda critical that i get this right. (...
- 11
2
votes
1
answer
314
views
Autocorrelation function of a filtered periodic signal
I'm having trouble with this exercise.
The signal $x(t)= \cos(2\pi f_0 t)$ is sent in input to a non-linear system with input-output relationship equal to: $g(x)= 0$ if $x<0$ and $g(x)=3x$ if $ x &...
- 75
1
vote
1
answer
129
views
Measuring amplitude of a pure sine wave of known frequency close to the noise floor
What I want to ask you comes from a place where I can play with all the parameters as much as I want (I can measure as long as I want and as fast as I want, as well as change sensor/ADC).
The signal ...
- 13
0
votes
0
answers
47
views
Jointly determining the weighting matrix and target vector in weighted least square
I have the same weighted least square form weighted least square composed of diagonal weighting matrix $ W $, IDFT matrix $F({\omega})$, desired response vector $D({\omega})$ and FIR Filter ...
1
vote
1
answer
71
views
How to find the orthonormal basis for these three signals
I've been given these signals:
$$S1(t) = 1$$
$$S2(t) = t$$
$$S3(t) = t^2$$
I have to find 3 basis functions using Gram - Schmidt algorithm on the interval $|t| \le 1$. Now, I know the procedure and ...
- 13
0
votes
0
answers
35
views
Problem regarding Inverse Z-transformation
I am doing research on time series analysis. I did a z-transform of the function $F(n)$. I get results as
$F(z) = \frac{1}{1-\frac{z^{2}}{(z-a)(z-b)}}$.
I tried to find inverse z-transform to find the ...
0
votes
0
answers
39
views
How do I find if my amplifier compressed the waveform?
I have a waveform that's modulated by a trapezoidal function. I fitted the envelope to the expected function to show if the amplitude is modulated correctly.
I also plotted the difference of the fit ...
- 111
2
votes
1
answer
70
views
Can a time signal be modeled as a multivariate Gaussian distribution?
Suppose I have several groups of signal measurements, each containing multiple replicates, and I know that within each group the signal "shape" is approximately the same but with variance/...
- 21
0
votes
1
answer
37
views
Unable to analyze current signals of 3 phase inducion motor
We are receiving 3 phase current readings from Induction motor using CT sensors. I am not aware of what processing is being done on the spot. My job is to do Motor Current Signature Analysis on it ...
0
votes
0
answers
56
views
In continous wavelet transform, all wavelets must have the same energy regardless of their scales,why?
In Continuous Wavelet Transform (CWT) To achieve energy normalization and to ensure that all wavelets have the same energy regardless of their scales, each wavelet is divided by the square root of the ...
0
votes
1
answer
78
views
Transfer function $h(t)$ of a positive feedback system
I want to find the transfer function h(t) of the below positive feedback system. I came out till this.
How can i get the inverse laplace of this function? say β = 1 and γ = 1
0
votes
1
answer
59
views
The benefit of Eigendecomposition of DCT and DST
I am Ph.D in pure mathematics and interested in signal processing.
Theoretically, any illustration of the eigendecomposition of the discrete trigonometric transforms (DTTs) is worthwhile.
Q. What real ...
- 345