Questions tagged [signal-analysis]

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Separation of a delayed mixtures of signals

I have three emitters in three different positions that emite three signals $S_1(t), S_2(t), S_3(t)$ with $$S_1(t)=S_2(t)=S_3(t)$$ Two receivers recive $R_1(t), R_2(t)$ with \begin{align} R_1(t)&=...
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20 views

Having Problem about DownConversion

I hope, you are doing well. I want to ask question about baseband conversion. Background: I generated two AM signals in MATLAB, which one of them is shifted in time. I multiply the signals with $\cos(...
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19 views

Threshold Estimation from a Linear FM Pulse Position Modulated signal

I have a signal chain to detect multi channel LFM (Linear Fm - Hann window being applied as shaping filter for the pulses) pulses as shown in picture below. (Numbers in the picture is in Hz., for ...
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18 views

calculate decibel SNR in percent

i have the following metric for calculating the SNR for my predictions: i basically dont calculate signal to noise but signal to error. x is my prediction and y is the true signal. When i have an ...
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28 views

How to make noise power estimation on a single tone transmission?

Suppose we have a single tone transmission over a Single Input, Single Output (SISO) channel impaired by Inter-symbol Interference and Additive White Gaussian Noise (AWGN). How to compute the noise ...
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27 views

simulation of lin-log amplification

I struggle with two simple questions. First. What is the distribution of the signal on the output of the lin-log amplifier if Rayleigh noise is driven to the input of it. Using an approach with ...
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12 views

Perceptual Based Adversarial Audio Attacks

I am reading this paper Perceptual Based Adversarial Audio Attacks I have a doubt what is meant by weighting in the frequency domain and what does Section 3.4-equation-4 wants to convey .Please refer ...
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6 views

For single tone transmission impaired by IES, how Doppler Spread is translated in Channel impulse response computation?

If we are to transmit in single tone transmission in a Single Input Single Output configuration. And the channel is impaired by awgn and inter symbol interference with the following characteristics: ...
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50 views

What is the name of signal / (signal + noise)

Signal-To-Noise ratio is defined as $$SNR = \frac{P_{signal}}{P_{noise}}$$ For my application, I find the following metric to be more useful $$\frac{P_{signal}}{P_{signal} + P_{noise}}$$ Does it ...
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15 views

Error in measuring wavelength/frequency using autocorrelation

I am currently using these two fonctions to compute to autocorrelation of a signal in order to measure the wavelength: ...
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26 views

log spectral distance interpretation

I am using the log spectral distance (LSD) as a metric to evaluate signals. I have 2 completely different signals pairs I compared. Pair (A,B) : signal A as pretty similar to B. There are only very ...
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1answer
38 views

Phase difference calculation between two wave files

I am doing comparison between two wave files, How to calculate phase difference between those files? Second wave is generated by making some changes in the first one .I have tried calculating phase ...
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23 views

Stability of a signal

I would like to know when I can determine that a system is stable. I've seen Stability of a system but this is very theoretically. My background is that I've set up a measurement system to detect the ...
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39 views

Phase difference between two wave files

I am doing comparison between two wave files, How to calculate phase difference between those files? Second wave is generated by making some changes in the first one .I have tried calculating phase ...
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20 views

How to identify the frequencies of periodic peak signals in a noisy time series?

Suppose to have two time series with peak signals at different frequencies, like these two: ...
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58 views

unitary matrix complexity multiplication

Having a unitary matrix $X$ whose size is $n \times n$ and a vector $z$ whose length is $n$, and let's have: $$y = X^H {\rm diag}(z)X$$ where $X^H$ is the conjugate transpose of $X$. My question,...
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27 views

Relationship of input-outputs in Hartley transformation based on few elements in a vector

This question is related also to that question HERE, but with further details and another issue I need to solve. Assuming we have a vector $X = [x_0,x_1,\ldots,x_N]$, its Hartley transformation is ...
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1answer
36 views

How to convert between function forms of single frequency signals

I have an equation x(t) = (3+4j)*e^(j*8*pi*t)+(3-4j)*e^(-j*8*pi*t) and am trying to convert between this and shifted sines and cosines. I'm attempting mash this through euler's formula and got a 10 ...
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5 views

Adding EOG noise to EEG signal

i have a data set from 2005 bci competition. it is removed from EOG components. to classification i want to apply deep learning methods on it. the problem is i want to survey deep learning performance ...
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26 views

The application of sparse Fourier transform

I try to understand the concept of sparse Fourier transformation, I can summarize it according to what I understood as following: Assume we have a sparse signal $x$ of size $N$x$1$ with only $k$-non-...
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24 views

How do I measure the amount of noise in a picture? (signal to noise ratio)

Hi ive got a uni assessment which requires me to find the Peak signal to noise range of my photos, I was wondering if there was an app or a simple way of measuring the noise of a singular picture, any ...
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30 views

Resources to understand DSP visually in 2020

I know you have been asked several times but the questions are old, and I would like to know if there are new intuitive web pages of applets or interactive DSP animations (Filters, FFT, Wavelets)
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1answer
16 views

Is the power or root-power scale correct for FFT analysis of an audio file?

I wrote Python scripts to create a spectrum analysis of audio files. The goal is to compare multiple spectrums to get the dB difference at certain frequencies. When I started using the Sonic ...
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1answer
25 views

Partial column approximation error

Can someone help me understanf how to plot the next partial column in MATLAB: while N=2001 |M|<700 ak =
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37 views

Understanding white Gaussian noise variance

Referring to the bellow figure, assume the WGN has a constant PSD equal to N0. When filtered at $B_1 = 100 Hz$, the variance of the time domain noise is $σ_1^2$, and when filtered at $B_2 = 5 Hz$, the ...
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1answer
42 views

PCMA signal separation

I want to work on co-frequency and co-time blind signals separation or carrier-in-carrier signal separation project. In articles published under the heading of blind separation of these signals, it is ...
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25 views

Signal is not audible after frequency re-sampling

I'm trying to change the frequency of an audio signal from 22050hz to 500hz. I'm using librosa to read the wav audio and pass the custom sampling rate as 500. Once read, I'm saving it back to audio ...
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31 views

How Can I Add noise to a Frequency Domain Input Signal?

I am new with Matlab and doing some work on Amplifier and Bipolar Shappers Amplifiers. Adding Noise to a Time Domain Signal is quite easy and I have done it multiple time as: ...
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9 views

Any DVB-S2 sample streams publicly available on-line?

I'm working on a DVB-S2 receiver and I'd like to be able to test a part of the DSP chain with real-world signals, but getting good sample streams from a digitizer is not terribly easy. Can anyone ...
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1answer
35 views

Smooth signal with Hanning

I have an acceleration record and i want to smooth it's spectrum by using a hanning window with Bandwidth=0.5 Hz. How could i do that? Example in python/matlab will be appreciated!
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1answer
16 views

Ambient noise levels in desert and recording studio

Are there mathematical models which suggest which of the two - desert or recording studio - is likely to be quieter? I would think a recording studio would be quieter than a desert. Is there a ...
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23 views

How can we generate an orthogonal sinusodial signal to any other signal?

I have three signals which are \begin{align} A&=\cos\left(2\pi ft + \frac \pi2\right)\\ B&=\cos\left(2\pi ft\right)\\ C&=\cos\left(2\pi ft + \frac {5\pi}4\right) \end{align} What i need ...
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24 views

EEG signal windowing and framing in python

I would like to do EEG signal(using 1 channel) Windowing and Framing. Actually I am doing my thesis and following a research paper.In this paper they explained "Windowing consists of dividing ...
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42 views

Estimation of Power Spectral Density

I'm learning some basic signal processing to use in my research. So I'm trying to solve this combined signal: $x(t)= \text{sin}⁡(60\pi t+\theta)+ 0.5 \text{sin}⁡(120\pi t+\theta)+ 0.3 \text{sin}⁡(...
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52 views

Determine the haar wavelet function is linear or nonlinear

I'm looking for analytical justification of linearity or non linearity of the wavelet transform with the real Haar mother wavelet function. I have googling already. But I can't find and understand ...
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38 views

How to separate EEG frequency band in python?

Sorry for stupid question! I am very new in EEG signal processing and python environment.I have started my a project work related to EEG signal analysis using MNE. I would like to separate EEG Bands ...
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37 views

How to Enhance the height difference of the experimental signal data?

I'm very new to signal processing. Is there any kind of method to enhance the signal of experimental data that I get from the experiment? Especially on the difference of y-axis. Thank you This signal ...
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33 views

Wind turbine vibration analysis approach

This is going to be a bit of a long post. My questions are: Do the 5 signal processing steps look "correct"? Next steps could be to perform order analysis, and extract features from time, frequency, ...
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37 views

Is there a way to break down a signal into its respective phases (4 in this case) to be later analysed individually

Is there a way to extract amplitude information but over 4 phases of the same frequency. That is, if the frequency is known could I extract amplitude peaks (between given values)in the time domain in ...
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29 views

How to approach Feature Extraction and Feature Selection part in machone learning in python?

I am a bit new to machine learning and I have the following questions: Question 1: When dealing with feature extraction with signals from sensors, what is the typical approach to extract features ...
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53 views

Feature extraction for exponentially damped signals

I am looking into exponentially damped signals where it is a stationary signal (after implementing the Adfuller statistical test) and I would like to look into how can I extract meaningful features ...
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13 views

Spectral kurtosis on non-stationary signal

I posted a question some weeks ago I still have not found an answer to. I updated the old question and am hoping someone could help. Link: Varying speed of shaft Spectral Kurtosis
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1answer
37 views

Determine reflections from received signal

I have a reference signal $r(t)$ and the correlation between that reference signal and the received signal : $C_{XR}(\tau)$. The signal I receive contains reflections on walls. I have to build a ...
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39 views

Time domain to angular domain approach

I have a rotating shaft where I need to move from the time domain to the angular domain to look for vibration faults. I have the data from a tachometer. From another post I found these steps: The ...
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1answer
27 views

Frequency change detection in step-wise frequency chirp

I am driving a system with a step-wise frequency chirp from 50-400 hz with a frequency step of 0.01 hz. I am having difficulty identifying the points of frequency change as the data collected has an ...
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22 views

Sonar parameters required for underwater objects shadow formation

I am doing some research on classification of underwater objects using high-frequency sonar. Can anyone kindly guide me what the essential parameters of sonar are resulting in prominent shadow ...
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14 views

Transforming acceleration to a world reference

I have a acceleration data relative to the sensor's coordinate and the sensor's rotation relative to the world coordinate.How can I transform the acceleration from the sensor's coordinate to the world'...
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29 views

Varying speed of shaft Spectral Kurtosis

I want to perform Spectral Kurtosis (Kurtogram) on 10-second vibration signal of 25.6 kHz sample rate, where the shaft is varying in speed. Will a preprocessing step of resampling the signal be ...
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1answer
70 views

Analyze PCM data

I am getting some 16 bit PCM data (raw bits) from a serial port . I need to collect this stream of bits using some python application running in PC and store it somewhere(Assume it in an array). I ...
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35 views

Is this PSK or FSK

I am analysing a captured 433.92MHz signal sampled at 2MHz: If we zoom in: I am thinking this is PSK? Am I wrong? Thanks

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