# 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.

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14 views

### Decoding Packet preamble success percent

I have a radio that stays on a channel for 500 milliseconds to listen to the packets and increment the detection_counter if packet is found( by correlating the preamble which is about 48us) For some ...
22 views

### How to avoid the edge effects that may occur when applying the Hilbert transform (by mirroring)?

How to avoid the edge effects that may occur when applying the Hilbert transform (by mirroring) for image or image series signal? Code is appreciated (in python) please.
1 vote
18 views

### implement gradient descent with sparsification algorithm

I am trying to implement the algorithm in this paper for finding a sparse vector x that minimizes the square error $\lVert y − \Phi x\rVert_2^2$ where $\Phi$ need to satisfy the restricted isometry ...
1 vote
49 views

### Power Spectral Density and Total Power Calculation for Signal

I am currently working on analyzing a signal with the autocorrelation function given by: $$R(\tau) = 100 \cos( 10000\pi\tau) (Λ(2000\tau))^2$$ I need assistance in plotting the power spectral density ...
34 views

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### How to express random signal in MATLAB which is transmitted from transmitter to receiver

I am trying to model a random transmitted signal between transmitter (source) to receiver. Specifically, the transmitter has $N_s = 1$ antenna and receiver has $N_r = 2$ antennas. My query is that I ...
46 views

### Why a windowed signal is considered to evaluate the Power Spectral Density?

Let's consider a real function of time $x(t)$ being a Fourier-transformable signal. The synthesis equation states that: $$x(t)=∫_{-∞}^{+∞}X(f)⋅e^{2πjft} df$$ Meaning: $x(t)$ can be seen as the sum of ...
1 vote
89 views

### Why are convolutions between those functions equivalent (signal processing for theoretical neuroscience)?

I'm reading a book on theoretical neuroscience , in which the following definitions are given: $\rho(t)=\sum_{i=1}^n \delta(t-t_i)$ where $\delta$ is Dirac's delta and the $t_i$ are timestamps at ...
44 views

### What am i doing wrong?

How do I remove the noise (long vertical lines) from signal? I am applying AC voltage via function generator which is amplified by the power amplifier to a 6mm thick steel specimen. The signals are ...
100 views

### How to extract the oscillation frequency from the following signals?

Signals contain both transient and stabilizing processes. In the transient process, the signal exhibits oscillatory behavior with damping. Is there some efficient algorithms to extract the frequency? ...
97 views

### How to determine the nature (real or complex valued) of a signal?

A signal X(t) is a real valued time domain signal and Y(t) is a signal that only contains the non-negative spectral components of X(t). How do I determine whether Y(t) is real-valued or complex? I ...
1 vote
54 views

### Sinus Pattern analysis

i have 1000 data which range between 50 and 180 ( heart BPM data in a day) how can i measure its similarity to a Sinus pattern? for example, for 20th recorded data (for example it is 60BPM), evaluate ...
1 vote
67 views

### Why is bandwidth inversely proportional to mulitpath interference?

I have a project related to Signals of Opportunity and during my research on the communication signals that can be used for navigation purpose I saw that as references are given below signals that ...
65 views

### What effect causes this Pattern?

I've conducted a measurement of underwater noise in a laboratory experiment. Therefore i am using a sweep signal. Sometimes -I guess when the signal is much more louder- I get this fascinating ...
148 views

### Demodulation + LPF gives derivative of modulated signal

I'm new in this community and I hope it is the right place to post my question. Unfortunately, signal processing and electronics in general are not my fields, so I'm sorry if the question is trivial. ...
398 views

### Integer multiples of fundamental period in sine wave

I have a simple question. Suppose I have a signal : $f(t)=\sin(2\pi \, 25t)$ We know that it's CTFT(continuous time fourier transform) will result in 2 delta's at +- $2\pi\,25$ [rad/sec]. Or ...
1 vote
76 views

### Why do complex signals and their real world equivalents have different measurements of power?

My understanding is that the relationship between complex signals and real signals is such that for some complex signal $f(t) = s(t) \cdot e^{j2\pi f_c}$, the actual broadcast signal sent through the ...
30 views

### How to compute the direction/bearing of a vector time series in the frequency domain (i.e. as a function of frequency)?

I have a time-domain magnetic field, $\mathbf{b}(t)$, with components $b_x(t)$ and $b_y(t)$ where $x$ and $y$ denote orthogonal coordinate directions (i.e north and east, respectively). At each time, ...
25 views

### How to Show Signals That Can Be Isolated

What would be the best way to plot or graph a mixed signal that contains other signals that can be isolated?
1 vote
231 views

### Overall spectrum computation from Short-Time-Fourier-Transform

I am trying to computing the overall spectrum of a given signal from its Short-Time-Fourier-Transform. I am using python to do this and I wrote my function to compute the STFT: ...
71 views

### Cfar Algorithm Implementation

I am trying to implementation Cfar algorithm to our radar signal processing algorithm. I obtained some output but I want to be sure that is right. Cfar algorithm's output below like, I'm interpreting ...
227 views

### Transfer Function Estimate

This is related to this post: https://engineering.stackexchange.com/questions/56050/obtaining-the-open-loop-gain-estiamte-the-gain-and-phase-frequency-response Using python, I would like to write a ...
1 vote
130 views

### How to normalize FIR filter gain from the amplitude response in frequency domain?

I've got a set of measured data (amplitude and phase responses) of a filter. And I want to normalize its gain to be unit (equal to 1) for further processing. I know that we can convert to time-domain ...
1 vote
85 views

### Is there a quadratic version of exponential smoothing?

I have a time series - let's say I'm given one new sample (a real value) every second. I could take a moving average of the last 50 samples or I could use exponential smoothing of the samples with a ...
65 views

### producing sine signal with few samples

I need to produce a signal of $\sin(2\pi\cdot 60\cdot10^6 t)$, where $t$ in sec, with sample rate of $2^{28}$ Hz. Since the signal has period of $\frac{1}{60\cdot 10^6}$ sec can I somehow sample only ...
70 views

### Abnormal Y-axis value after performing FFT

I have an UFF file which consists of Vibration data. The objective is to convert the timewaveform signal to frequency domain. I have written a python script to convert the timewave form signal to ...
109 views

### Onset time determination of fast pulse

I am looking for the most precise way to determine the onset time of a very fast pulse sampled at 5 GHz coming from a physics detector. Here is an example of my signals: I already tried different ...
1 vote
46 views

### Processing of Channel State Information from WiFi for Generalizability

For my master's thesis I collected CSI with 4 WiFi network cards (Intel AX210) for three different persons for 102 positions (spaced roughly 30cm apart). The covered area was around 10m x 7m and in ...
1 vote
115 views

### Why are analytical wavelets said to have no negative frequency?

I have been reading about analytical wavelets and came across this definition: An analytic wavelet is a complex wavelet such that its Fourier transform is null for negative frequency. If it is a ...
193 views

### Average of a set of transfer functions: how should I treat the phase?

I have a set of transfer functions obtained by impacting an instrumentation hammer against a mass, measuring the acceleration on a set of accelerometers; the result is shown below. I want to get a ...
45 views

### Show a grid with specifications and hide the horizontal and vertical ticks label [closed]

This is a code I made for cleaning and visualizing raw ECG data from physioNet. I want to make some enhancements to the output and can't figure out how so I am asking if someone could help or give me ...
We are using $4 \times 4$ corehw antenna array with nrf52833 mcu as the receiver and nrf52833 as transmitter. When working on AOA Direction Finding, we found that each element in the antenna array has ...