0
votes
0answers
4 views

How to compute Stockwell transform?

I am trying to implement Stockwell transform in MATLAB following the procedure given in link"http://www.sciencedirect.com/science/article/pii/S0378779605002646".I suppose multiplying the signal with ...
2
votes
1answer
9 views

How to establish transfer function of a speaker?

I'm working on a signal processing project about vocal system, and I'm trying to use controlling theories to solve the problem. I need to get the transfer function, $H(s)$, of a speaker, from ...
0
votes
1answer
13 views

Advantages of 2-VSB vs BPSK?

Both BPSK and 2-VSB transmit one bit of information per smybol and both modulate the real part of the signal. The difference is, as far as I understand, that BPSK does not modulate the imaginary part ...
0
votes
0answers
7 views

Alignment of signals for ensemble averaging? Something else?

I have been applying ensemble averaging (adding signals of different trials to obtain one signal) to improve Signal to noise ratio in my data. I have achieved good results in terms of classification ...
-1
votes
1answer
18 views

Deriving impulse response from frequency response?

In Oppenheim's Discrete Time Signal Processing the frequency response is given by $$H_d(e^{j\omega}) = \sum_{n=-\infty}^{\infty} h_d[n]e^{-j\omega n}$$ then the impulse response $h_d[n]$ can ...
1
vote
0answers
5 views

Measuring sharpness/contrast

For the implementation of an auto-focus for the raspberry cam I need some measure of image sharpness. I used the following sample picture: The first approach was to compute the shannon entropy of ...
0
votes
0answers
11 views

LFSR in communication [on hold]

I need to use Linear Feedback Shift Register (LFSR) to generate random frequencies at which I will be shifting my signal. How can I do that? I don't understand when to choose which taps for a specific ...
0
votes
0answers
11 views

Looking for a way to monitor raw microphone digital output?

This is sort of a cross between a data processing and Physics question, but I would be grateful if anyone here could help me. My objective is to calculate the sound pressure level (in dB) of a sound ...
0
votes
0answers
13 views

Anti tremor motion detection

I'm programming in c# using opencv (emguCV). I use motion detection approach to detect some changes in a paper wall. For example it's may be colored by a laser pointer. My problem is that when I use ...
0
votes
1answer
40 views

Converting poles/zeros to differential/difference equation solutions

Does anyone have a reference handy on how to convert poles and zeros of a system to differential/difference equations. Here is a quick draft of math, but I am not sure if it's at all correct. First, ...
0
votes
0answers
14 views

What after image segmentation? [on hold]

I've read about different techniques to segment images. I tried the segmentation technique which involves clustering features extracted from a depth image (which includes position, color, depth). I ...
0
votes
1answer
13 views

Question about MRI signal construction

As I understand it, in MRI, a line in k-space is usually acquired while the readout gradient is applied. So during the application of this gradient the protons spin at different frequencies along the ...
0
votes
0answers
23 views

Frequency domain beamforming for 8 antennas and 4096 samples

I'm currently trying to write a Python program that beamforms a set of radar data I have. The data is from a system of 8 antennas where each antenna has a time series consisting of 4096 values. I ...
1
vote
2answers
48 views

Mathematical justification for zero padding?

This question asks what's the point of zero padding. The accepted answer is certainly very insightful, but I don't understand a big chunk of it: Zero padding allows one to use a longer FFT, which ...
2
votes
0answers
12 views

How do optical anti-aliasing filters work from a frequency domain perspective

To prevent aliasing, caused by the finite number of pixels on a sensor, a blurring filter is commonly used. How does that work from a frequency domain perspective? What is the transfer function of ...
0
votes
2answers
25 views

Digital RF signal vector resize algorithm

I'm searching for an algorithm for resizing a RF sampled signal in order to draw it without losing any important maximum or minimum values. The values of the vector are negative/positive around zero.
1
vote
0answers
24 views

Calculating Phase Response for 2 microphones given the input

I want to measure and compare the phase response of two identical microphones. To do this, I have a pressure chamber, which allows to apply the same pressure to both microphones. I apply a sweeped ...
1
vote
0answers
29 views

Designing bandpass FIR filter MATLAB

I am trying to design a FIR bandpass filter for a STM32F407 microcontroller with a passband of 1kHz between 59500 Hz and 60500 Hz or something similar (since I don't really know how tight I can ...
0
votes
0answers
15 views

Doppler frequency to radial velocity in a given bandwidth

given the Bandwidth of the signal (say 20MHz) and Doppler frequency ranging from -100KHz to 100KHz for the Auto Correlation 2D plot. Can somebody kindly explain me what is the radial velocity with a ...
0
votes
1answer
38 views

PSD of a sum of two stationary real signals

I have 4 signals ($w_1(t),w_2(t),u_1(t),u_2(t)$ of which I know the power spectral densities (PSDs) $S_{w_1,w_1}(\omega),S_{w_2,w_2}(\omega),S_{u_1,u_1}(\omega),S_{u_2,u_2}(\omega)$ and the cross PSD $...
0
votes
0answers
13 views

Does the S-transform have phase linearity?

S-transform is said to be a time-frequency distribution and also it is linear with frequency. Is it linear with phase also? If not, how can I find the phase relation between two signals?
0
votes
1answer
20 views

What is the link between equation of a continuous signal versus equation of its sampled form?

I have just started DSP self-learning. I am a little confused by this 'end of the chapter' exercise question from Chapter 2 of "Understanding Digital signal processing" 3rd edition by Richard G. Lyons....
1
vote
1answer
27 views

Fourier transform of moving image sensor

Consider an image sensor that is moving with some velocity $\mathbf{v}(t) \in \mathbb{R^3}$, and an orientation $\mathbf{R}(t) \in SO(3)$. Treat those vectors as fixed. At a specific time $t$ the ...
-2
votes
0answers
9 views

Bandwidth of ofdm symbol in a visible light communication system

What is the difference of the bandwidth of the LED and the optical channel? If ofdm symbols are transmitted over this system, is the bandwidth of ofdm symbol equal to BW of the LED or of the channel.
0
votes
1answer
40 views

Elegant way of calculating minimal sampling frequency without aliasing for annoying signals

Given a symmetric Fourier transform with finite support as below, there's an algorithmic procedure to determine the minimal frequency for sampling without aliasing: Find an integer $L>1$ ...
0
votes
0answers
8 views

Gabor Filter implemetation in frequency domain with three different filter central frequencies and 4 orintations

I am trying to construct a Gabor filter with 3 different central frequencies and 4 different orientation. But for a particular frequency, for all the orientation I am getting the same response, I don'...
1
vote
0answers
14 views

Physical Interpretation of A Beamforming Matrix

The directivity of an array is defined as: $$ D = \frac{1}{2} \int_{-1}^{1} |B_{u}(u)|^{2} du$$ Where $B_{u}(\cdot) = \mathbf{w}^{H} \mathbf{v}(\cdot) $ is the beampattern of the array in u-space, $\...
1
vote
1answer
38 views

Derivation of Bessel filters

I was reading Winder's Analog and Digital Filter Design and the section on Bessel filter. I was hoping to see a complete derivation of the Bessel filter theory, but Winder's book gives only \begin{...
0
votes
1answer
23 views

Comparing the control performance of a given closed loop system

I am having a question about comparing the control performance of a given closed loop. In this link there are some characteristic values that need to be calculated, but there is no description of what ...
0
votes
1answer
23 views

Insertion loss equality - proof

From this paper (slide 11), the insertion loss (or attenuation) is defined as $$ L(\omega^2)=\frac{\lvert V_i(j\omega)\rvert^2}{\lvert V_o(j\omega)\rvert^2}=\frac{1}{\lvert H(j\omega)\rvert^2}=10 \...
-3
votes
0answers
16 views

Which Frequency output is correct? [on hold]

I have taken and modified the following code from this CodeProject article: https://dotnetfiddle.net/mVfT77 The following GUI test produces good results: https://dotnetfiddle.net/gV9akg Now, I ...
0
votes
0answers
13 views

Help !! Searching for a good university public or private to study image processing in europe any suggest? [on hold]

Searching for a good university public or private to study image processing in europe any suggest ??
1
vote
1answer
31 views

Gradient of TV norm in total variation denoising

In this link, it says that the gradient is as follow The Gradient of the TV norm is $$ \mathrm{Grad}J(f)=\mathrm{div}\left(\frac{\nabla f}{\lVert\nabla f\rVert}\right). $$ From this other ...
1
vote
0answers
39 views

Autocorrelation of a $L$-point moving average system

The $L$-point moving system is: $$y[n]=\frac 1L\sum_{k=0}^{L-1}x[n-k]$$ $x[n]$ is a Bernoulli random signal with $\beta=0.5$ (equal probability) The autocorrelation of $x[n]$: $\psi_{xx}[m]=\delta[...
0
votes
1answer
25 views

Independent component analysis for one observation of a Signal

So I am a complete novice to ICA, so excuse my question if it is bad one, but I have the signal: $$\sin(2\pi x) + \sin(4\pi x) + \textrm{Additive White Gaussian Noise}$$ I want to try to separate ...
0
votes
1answer
28 views

Why can FFT only operate on images with specific properties?

Can FFT only operate on Grayscale images? If Yes, why? Can FFT only operate on images with dimensions of power of two? If Yes, why?
0
votes
0answers
11 views

Why two audio file exported the same way have different checksums? [on hold]

I tried to export a recording from Audacity twice, each time with the same parameters and tags. The resulting files had different checksums. So I opened up an diffed the two files (as binary). My ...
0
votes
1answer
43 views

MATLAB center frequency shift

I am wondering how to shift the center frequency of the below complex data from 0, to say 20 MHz (10 MHz to 30 MHz- 20 MHz bandwidth). I tried to change the indexing of the bins but I could not get ...
0
votes
0answers
17 views

Implementing bayesian detection

Our teacher gave us a problem in which there is a system that sends binary information. If it sends a $0$, then it sends the value $1$ for $n$ instants of time; if it sends a $1$, it sends the value $-...
-1
votes
1answer
22 views

involutory transformations - why are they not so much used in signal processing? [on hold]

We generally prefer orthogonal transformations/matrices in signal processing as the transpose of the matrix is the inverse and you do not need to find inverse transform separately. But involutory ...
1
vote
0answers
18 views

Why is the term deconvolution used more for signals and not so much (or at all) for systems?

Wikipedia defines mathematical deconvolution here, and with the examples given and my experience, what I've read over the years is that deconvolution is used to determine an input signal provided a ...
0
votes
1answer
16 views

frequency characterritic of activ high pass filter [on hold]

How can i see the characteristic(frequency response) of an active high pass filter?I attached the circuit and the value of resitence .Can i see it on the computer without an osciloscope ?How can i ...
0
votes
0answers
4 views

Am to measure fatigue in different individuals using EEG based BCI [on hold]

How do I measure the brain activity using BCI i.e where the recorded signals will be viewed How do I interpret signals that constitute fatigue What method is the best for extraction of these signals ...
1
vote
0answers
33 views

Minimum Output Samples needed to crack a “Gold Code” Generator (Dual LFSR)

Please preface your answer with spoiler notation by typing the following two characters first ">!" Below is an implementation of a "Gold Code" Generator formed by adding (in $GF(2)$) the outputs from ...
1
vote
1answer
24 views

Finding the deterministic autocorrelation function (ACF) from its power spectrum

The power spectrum of a stationary discrete-time random signal is $$\Phi_{xx}(e^{j\omega})=\begin{cases} 1 & |\omega|<\pi/2 \\ 0 & \pi/2 <|\omega| \le\pi \end{cases} $$ (a) ...
0
votes
1answer
30 views

Bode plot of discrete-time transfer function $H(z)$

$H(z)$ is the transfer function of a biquad filter as described here. I would like to plot the Bode plot of the magnitude response of $H(z)$. Scipy has a bode method (...
1
vote
4answers
103 views

Why is a linear phase important?

If symmetry conditions are met, FIR filters have a linear phase. This is not true for IIR filters. However, for what applications is it bad to apply filters that do not have this property and what ...
0
votes
1answer
46 views

Trouble Implementing Huggins Binaural Pitch

I'm trying to make an implementation of the Huggins Binaural Pitch illusion, which is where if you play whitenoise into each ear, but offset one ear by a period $T$ that it will create the illusion of ...
1
vote
1answer
32 views

DTFT and Inverse DTFT Homework Problem

I'm trying to solve this signals homework problem: So for part a, since multiplication in the time domain is convolution in the frequency domain, I just used a DTFT table, found the DTFT for $\left(...

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