Questions tagged [signal-analysis]

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Why is the frequency measured in radians in filter design?

This is my first time posting a question, so sorry if my articulation is not proper. I'v just started out with FIR filter design and I see the domain being -$\pi$ to $\pi$. Now I understand that ...
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28 views

unitary matrix complexity multiplication

Having a unitary matrix $X$ whose size is $n$x$n$ and a vector $z$ whose length is $n$, and let's have: $y = X^Hdiag(z)X$ , Where $H$ is conjugate transpose My question, is the complexity of this ...
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26 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
41 views

GSP as an extenstion of DSP

I am a PhD. in pure mathematics. Could you please illustrate the following statement: the eigenvectors of a graph Laplacian behave similarly to a Fourier basis, motivating the development of graph-...
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2answers
43 views

Relationship between input and output sequence in Hartley transformation

As you know that Discrete Hartley transformation is related to the discrete Fourier transformation, $i.e$, assuming we have a vector $X = [x_0,x_1,\ldots,x_N]$, its Hartley transformation is equal to $...
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1answer
30 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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0answers
29 views

How to determine number of observations based on measurement frequency?

So I'm working on a problem where I'm measuring a signal with two different instruments -- one is a low frequency measurement system (1 Hz), and the other is a high frequency measurement system (200 ...
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0answers
45 views

Signal processing

I am quite new to signal processing and I have got the signal in picture. I'm working with Python. The central part has some sort of periodicity and it is the one I want to retain, whereas I want to ...
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0answers
28 views

Basic parameters in digital communications wireless RF [closed]

I'm a beginner in signal processing in RF. I have a transmitter and receiver. The transmitter is sending packets to the receiver. The receiver actually is an RF dongle that captures data from the ...
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2answers
82 views

Question about linear combination of non-stationary signals

Suppose $f_1,\ f_2,\ ...\ f_{n-1},\ f_n$ are $n$ non-stationary discrete signals of same length and linearly independent. Each $f_i$ is an intrinsic mode function (IMF) of a seismic signal evaluated ...
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1answer
40 views

Upsampling implementation

I have problem with upsampling implementation in the following way: My code: ...
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1answer
32 views

what happens if you take the absolute value of a complex modulated signal? [closed]

I was going through some methods of eliminating carrier frequency offset (CFO). and one way is to take the absolute value of a received signal (somewhat like looking at the power of the signal) and ...
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2answers
38 views

Best way to detect steps and slopes in a signal

what is the best way of detecting larger steps and slopes in a signal? (as shown in the pictures, 1. to be detected signal, 2. good signal) I thought about some kind of sliding window analysis. Thanks ...
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1answer
29 views

What is the effect of sampling time, sampling frequency and SNR on latency? [closed]

I believe that if we have two or more external sound cards, hence clock would vary for each device. How will this affect the latency? Will it increase or decrease? How will the factors like sampling ...
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1answer
43 views

Why do we need to make simulation not only on baseband but also on passband?

What is the purpose of doing passband simulation, what are the signal processing imperfections we can reproduce in passband? In other words what are we missing if xe simulate only in base band? It ...
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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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1answer
68 views

DSP based FMCW radar

I have an SDR receiver I'm interested in making into a FMCW radar. The bandwidth is somewhat narrow as it only samples at 64 MSPS. There is a problem in that without a bunch of embedded programming ...
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0answers
60 views

How to compute (in non adaptative way based on MMSE FIR) the feedback and feedword filter for DFE equalization?

System Model Consider the single-input single-output (SISO) communication system in the figure below: where the information bit stream is encoded and mapped such that the output of the encoder is a ...
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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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1answer
8 views

Receiver figure of merit

So I am solving receiver figure of merit. I have gain in dB and noise temperature in K. I know [G/T] = [G] - [T] dB/K Here should I need to take T in dB or just as K?
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23 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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1answer
17 views

How to plot BER Vs SNR of a received signal

I am using USRP to transmit and received MIMO frames similar to Wi-Fi standard that I created on my own. After receiving the signal, it is processed as described in the standard. While I plot the ...
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0answers
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
21 views

How to calculate pitch fundamental frequency f( 0) ) in time domain?

I am new in DSP, trying to calculate fundamental frequency ( f(0) ) for each segmented frame of the audio file. The methods of F0 estimation can be divided into ...
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1answer
29 views

Taking the area under a square pulse

Hey Stack Overflow community, I've been given a series of datasets that resembles a square pulse, and ideally looks like the following: This particular plot is composed of many sets of data. I'm ...
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1answer
26 views

Sampling Signals [duplicate]

A Continuous Time signal is given by $π‘₯(𝑑) = \text{cos}(200πœ‹π‘‘) + 2\text{cos}(320πœ‹π‘‘)$. A sampled signal, $π‘₯_𝑝(𝑑)$, is produced by sampling $π‘₯(𝑑)$ at sampling frequency $f = 300 \text{ Hz}$. ...
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2answers
150 views

Sampled and aliasing signal

π‘₯(𝑑) = cos(200πœ‹π‘‘) + 2cos(320πœ‹π‘‘). π‘₯𝑝(𝑑), is produced by sampling π‘₯(𝑑) at sampling frequency $f = 300 Hz$. Is the signal sampled or aliased and why?
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1answer
13 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
18 views

How to decide filter order in Linear Prediction Coefficients ( LPC ) while calculating formant frequency features?

I am new in signal processing and trying to calculate formant frequency features for different .wav files. For calcuating formant frequency, I need three parameters values : Linear Prediction ...
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2answers
142 views

Cross correlation and cross power spectrum for signal + noise

Quick question about my understanding of cross correlations and cross spectral densities. Let $C_{ab}$ be the cross correlation between the signals $a$ and $b$, i.e., $C_{ab}(\tau) = \langle a(t)b(t+\...
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2answers
45 views

Are there any difference between the FFT magnitude of a signal and average FFT magnitudes of the signal broken into multiple frames?

Suppose I calculate the FFT of a 5 seconds sound wave. If I'm only interested in the FFT magnitudes across frequencies, I should obtain the same result if I segmented the sound wave into five 1-second ...
1
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1answer
25 views

IFFT and sample count issue in OFDM

I wrote a python program to generate OFDM packets (i.e. the IQ samples) with a custom payload to, for example, be transmitted via an SDR. After mapping the chunk of bits corresponding to one ofdm ...
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1answer
39 views

How can I create a jamming signal for desired frequency?

I am working on GPS interferences and countermeasures. I came across jamming in GPS receivers. So I have a input signal with frequency of 1200 MHz How can I create a jamming signal that can mask ...
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4answers
52 views

Signal analysis: selection of oscillatory parts

I'm trying to analyze the following signal: My aim is to select the high-amlitude oscillation parts limited by the red stars. At the beginning, i have tried to set a threshold and keep only the ...
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1answer
22 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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0answers
8 views

Model of modulator and demodulator in Simulink. Why is MER so lowest?

I created a simple model in Simulink of a quadrature modulator, amplifier and quadrature demodulator. On the oscilloscope(scope in Simulink) and spectrum analyzer the displayed results look normal (at ...
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0answers
30 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 $Οƒ_1^2$, and when filtered at $B_2 = 5 Hz$, the ...
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1answer
38 views

harmonic waves as integer multiple in spectrum

i have a motor that is rotating with a certain frequency. If i check the frequency spectrum it contains a peak on 150 hz. Also i have peaks at 300,450,600 ... i guess that those peaks are harmonics. ...
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1answer
38 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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4answers
93 views

Extracting fundamental amplitude/phase from only half a period of a pseudo-sinusoïd

Before you read my problem, I've summed up my experiments in a notebook available here. So, I have a few noisy samples (~50) of a pseudo sinusoidal signal for which I use a traditional discret ...
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1answer
59 views
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23 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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1answer
39 views

Initial rest condition for the linear constant-coefficient differential equations

Suppose that system has the input/output relation as follows $$\sum_{k=0}^{N}a_k \frac{d^ky(t)}{dt^k} = \sum_{k=0}^{M}b_k \frac{d^kx(t)}{dt^k}$$ Where $a_k, b_k \in \mathbb{R}$. Obviously we ...
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2answers
152 views

Negative group delay and envelope advance

I am having a doubt reading about delays in signal processing. Let there be an input to a LTI system with frequency response $H(f)$, given signal $x(t) = a(t)\cos(2\pi f_ot)$, where $a(t)$ is a ...
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0answers
29 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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0answers
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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0answers
21 views

Phase Noise for OFDM systems (discrete-time Wiener process) [duplicate]

I am trying to make a Matlab code for a phase noise model for OFDM systems, the literature suggests that the phase noise is modelled as a discrete-time Wiener process. Could you please help me to ...
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3answers
46 views

Detect abrupt changes in signal

I'm using MATLAB and I'm trying to find the index of the first signal drop as shown in the figure bellow : I tried the function findchangepts but it didn't give me the exact index, any solutions ?
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1answer
48 views

Convolution vs multiplication vs polynomial multiplication?

Apparently these 3 terms are some how similar but what is exact difference between them?please kindly explain with example, because the number of terms in result/output are different in all 3 cases ...
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1answer
29 views

Need a similarity metric that describes these two curve as highly similar

I have a large number of time series data and I need to be able to compare the similarity of the curves to a reference curve. The reference curve in question is shown in red in the figure, and I'd ...

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