instruction stringlengths 31 27k |
|---|
According to Deblurring Dynamic Scenes via Spatially Varying Recurrent Neural Networks, given a 2D sharp image $x(m, n)$ and a blur kernel $h(k, l)$, the blurred image is obtained as
$$
y(m, n) = (x*h)(m, n) + e(m, n) = \sum_{k=-\infty}^{\infty}\sum_{l=-\infty}^{\infty} h(k,l)x(m-k, n-l) + e(m,n),
$$
where $*$ is the c... |
From the book Fundamentals of Massive MIMO, the section 2.3.4 shows that the expression of the received signal in fading channel with additive non-Gaussian noise and no CSI at receiver is dervied as:
$$y = \sqrt{\rho}\operatorname{E}(g)x + \sqrt{\rho}(g-\operatorname{E}(g))x + w,$$
where $\rho$ is a constant, g stands ... |
I'm trying to figure out what kind of equations i can use in a situation like this:
I know the relation between $x(t)$ and $x[n]$ is :
but then $x[n]$ is multiplied by a pulse train, with a different period than $T_s$.
What kind of relations apply after that operation? What will be the CTFT of that signal?
|
I would like to design (e.g. in GNU-radio) a low-pass filter where up to the cut-off frequency the phase-response is constant (I do not mean a "linear-phase response"). The rationale is to allow the signal to "pass" without being modified in any (significant) way and removing every unwanted frequency (which only has no... |
I am new to the field of DSP and I am currently working on implementing a real-time audio spectrogram using STFT technique.
While making progress, I have encountered an issue when testing a constant sine wave at approximately 294Hz (this happens in other frequencies too, this example is specifically during this frequen... |
I've started working as a wireless engineer fresh from college. I wanted to learn LTE standard and I don't know where to begin. I was wondering if you could guide me through this process. I found some sources online, but I don't want to jump into it.
Do I need to remember all the details? What parts of the standards do... |
my goal is to sample a signal that I generate in Simulink and do some "real time" DSP. I want to try implement some signal classification techniques I have been learning.
I tried to make a very basic QPSK signal and send some randomly generated variables over the path, no noise added:
I am able to sample it at my desi... |
I'd like to output the frequency response of this filter.
Here's how the coefficients are calculated:
void StateVariableTPTFilter<SampleType>::update()
{
g = static_cast<SampleType> (std::tan (juce::MathConstants<double>::pi * cutoffFrequency / sampleRate));
R2 = static_cast<SampleType> (1.0 / resonance);
... |
I am doing a project about the fractionally spaced equalizers on matlab. The goal is to mitigate ISI on the signal using the LMS algorithm to update the tap weights of the FSE. Below i have uploaded the whole code.
I have done most of the project but have some problems on the final part. When i try to write the LMS alg... |
I know the discrete cosine transform (DCT) is used for compression, but can anyone give an example of how to use it for bandlimited interpolation?
One way might be zero-padding in the DCT domain and then taking the IDCT. What is the time domain result of zero-padding in the DCT domain, and does it have any advantages o... |
Note: this question was initially asked in a different community.
Encouraged by the comments, I decided to cross-post here too.
Given (z,p,k) my goal is to convert to a state-space representation (A, B, C, D) with high numerical accuracy and stability. I do not really care about complexity and implementation cost.
One ... |
I have some questions of direct sequence spread spectrum.
Does dsss need a pulse shaped filter before it is transmitted?
And is there any reference how to realize a dsss system in digital communication, especially PN code acquisition and tracking loop?
What’s differences between a Code acquisition and time locked loop... |
I would like to understand the relation between OFDM parameters and channel parameters. I know the following:
length of cyclic prefix > delay spread
ofdm symbol time > coherence time of the channel
subcarrier spacing >> delay spread of the channel
Is subcarrier spacing also related to coherence bandwidth? One reason is... |
I am studying ADPCM and while I understand the concept I cannot find an explanation for some of the calculations in available implementations such as the one outlined here:
step_index = step_index + ima_index_table[(unsigned)nibble]
diff = ((signed)nibble + 0.5) * step / 4
predictor = predictor + diff
step = ima_ste... |
I expose films in a jig with pin pricks as reference markers. I use these references to register the scanned images of the film to other data.
I've been using mouse click coordinates to date, but I need to automate it and can't find a robust way to detect the pin pricks using binary image processing. I've tried various... |
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 frequency, in order to determine the instantaneous attributes (amplitude, phase and freq.) of non-modulated signals? For ex... |
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:
$$
x(t) = \sum_{n \in \mathbb{N}}^\infty c_n g(t-W_n)
$$
where $c_n$ are random amplitudes (the distribution of which I have not ... |
CORDIC is a well-known method for quickly computing exponentials and logs, including trig functions and their inverses by decomposing the angle into conveniently computable increments and then repeatedly applying the rotation increments in such a way to approximate the desired angle.
What is less well-known is that it ... |
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 / 2) / chirp_rate
where,
Nrg = 30000 samples along range,
Fs = 25 MHz
chirp_rate = 3 THz/s
c = 3e8 m/s
Before Applying St... |
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 a some degree rotation during its design.
Therefore to compensate this phase rotation, is there any document related to... |
I have resolved peak locations using Octave findpeaks command:
[pks, idx] = findpeaks(totalmag,"DoubleSided");
semilogx(nf,totalmag,nf(idx),totalmag(idx),'ok', 'linewidth', 2);
where totalmag holds logaritmically spaced magnitude response sum of 18 peak filters. Magnitude of each filter is got with bode command:
nf = ... |
I'm working on a phase vocoder pitch shifter running in C++ on an embedded microcontroller platform. I've successfully written the phase vocoder using the optimized FFT library, and it appears to be working well for analysis and resynthesis. With no processing on the phase vocoder bins audio throughput sounds clean.
I'... |
I have a simple question to ask:
Suppose $x[n]$ is finite and has a support for $|n|<L$
Let's denote its DTFT by $\operatorname{DTFT}\big\{x[n]\big\}(e^{j\omega})=X(\omega)$
Let's consider a unity window function $w[n] = 1$ for $ |n|< L$ which has the DTFT $W(\omega)=\operatorname{DirichletKernel}(\omega,2L)$ (which... |
As I understand Linear Constraint minimum variance (LCMV) beamforming weights can be expressed as a solution of a convex optimization problem.In this case we have cost a function to optimize and there are some constraint which must be satisfied by the solution. GSC is a framework to rewrite the LCMV problem into a opti... |
I was trying to decompose an EMG signal, which was sampled at 200 Hz, into 7 levels of decomposition using DWT.
And the result is shown in the figure( only up to level 3 is shown here)
However, I would like to know, how to see in MATLAB that with each level, the frequency is split into high and low. How to find the pow... |
I have clean ECG signals and I want to add noise to them. Specifically, I want the noisy signals to be closest to "real life" type of noise.
Reading this paper, I noticed that the researchers distinguished between different type of noise, each from a different artifact. The artifact are Electrode Motion Artifacts (EM),... |
I'm reading through the 3rd edition of John G. Proakis Digital Signal Processing and I came across a possible errata in Figure 2.35c on page 116. I couldn't find any errata sheet on the publisher's or author's website. It appears to me that the "-a1" and "-a2" labels on the diagram on Figure 2.35c are swapped when comp... |
I am reading a paper called "Design and Comparison of Three 20-Gb/s Backplane
Transceivers for Duobinary, PAM4, and NRZ Data" and got stuck on seemingly easy thing, how the Z-domain representation of the shown precoder is given like that? I am thinking that XOR is not even a linear operator to have a Z-transform for it... |
Let me preface that I am new to audio processing and audio analysis ;) (I asked the same question on reddit, I wanted to increase it's reach))
I am trying to classify specific events (like a gong or the clank of hitting a pipe) from audio data in an environment where people are. Recording people is a big no no here. (W... |
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 a hint as to where to search. In the output, we have 2 figures each with 4 subplots.
I want to make the output appear s... |
In order to image a scene with a certain resolution I would have to fly a certain distance. The longer the flight, the better the azimuth resolution. This is determined by the following formula
$$\rho_a=\frac{\lambda_c R}{2L}$$
Where $\rho_a$ is the azimuth resolution, $\lambda_c$ is the wavelength, $R$ is the distance... |
I have three versions of a 16-QAM modulated signal, each showing the time curve of the real and imaginary parts, the spectrum and the symbol constellation. These three versions differ by the respective pulse shaping method (sinc, rect, raised-cosine or root-raised-cosine).
Is there any possibility to assign the corresp... |
Technical Background
I'm making an audio processing board with an onboard microcontroller that takes in data via I2S from an ADC, applies digital filters, and outputs a stream of the same samplerate via I2S to a DAC. I plan to use DMA with double buffering/ping-pong buffering, wherein I receive one interrupt once a buf... |
In Learning Recursive Filters for Low-Level Vision via a Hybrid Neural Network, the hidden state of the recurrent neural network (RNN), after some simplification, presented as
$$
h[k] = (1-p)\cdot x[k] + p \cdot h[k-1].
$$
Then it is stated that the derivations with respect to $h[k]$, denoted as $\theta[k]$, is as the ... |
I am doing a project in MATLAB about the fractionally spaced equalizer. The method that i have chosen to update the tap weight coefficients is the LMS algorithm. Here is the block scheme that i have tried to follow:
x(k) are the elements of the received training sequence.
p(k) are the tap weight coefficients.
The ve... |
I am currently working on a project that involves analyzing the frequency response $H(e^{j\omega})$ of the filter $H(z)= \frac{1}{2} (1+z^{-1})$. However, I am unsure about the specific steps and formulas required to compute the frequency response. I have a basic understanding of trigonometry and suspect that trigonome... |
I have the original samples $\{x_1(nT)\}_{n=1}^N$ of a signal $x_1(t)$, where $T=\frac1{f_\mathrm{s}}$ is the sampling period. I want to find the samples $\{x_2(nT)\}_{n=1}^N$ of the signal $x_2(t)=x_1(t-\tau)$ from these samples. I used the sinc interpolation like this
$$x_1(t-\tau)=\sum_{m=1}^Nx_1(mT)\text{ sinc}\lef... |
I want to mention upfront that I'm not very experienced in this field.
I have a signal $u(k)$ that I get from a black box simulation (sampled irregularly). The signal looks like this:
The blue signal has small frequency oscillations that i want to remove. The orange curve was obtained by fitting a polynomial on the wh... |
I have been given the following spectrum, and I want to find a and b such the pulse satisfies the Nyquist criterion, given that the bandwidth of the pulse is 2 kHz and the sampling frequency is 3 kHz. How do i proceed?
|
I am trying to simulate a plant on a microcontroller. The transfer function of the plant is
$$ G_{p} \left( s \right) = \frac{2}{\left( s + 3 \right) \left( s - 1 \right)} \tag{1} \label{1}$$
The step response for this function from Octave is
The value goes to $200$ in $6$ seconds and this is what I am trying to repro... |
I'm implementing a project which interacts with a Text To Speech library. It generates speech segments and then returns the waveform, which can be manipulated/saved according to my needs. Those segments must add up to a specific duration, but the speech generation does not have this type of accuracy. So that's why I'm ... |
How to derive the sepctrum of $$x(t)=\sum_{n=-\infty}^{\infty}\delta\left(t-nT-\tau_n\right)$$
where $\tau_n\sim N\left(0, \sigma^2\right)$
I assume that the randomness effect should behave as a low pass. Yet, I am struggling to derive it analytically.
|
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 curve to generalize the behavior of the system, in magnitude it is as simple as averaging the magnitude of the signals, how... |
I am new to signal processing and I am trying to demodulate the IQ data, and I am stuck on the carrier frequency offset compensation.
I has 1000 samples and it is 1MHz data.
For the general idea, I think what makes the constellation of IQ data spinning is because of the non-zero value of delta omega, exp($\Delta wt +... |
I am analyzing functional MRI data with a sampling rate of 1 second (1 Hz). The frequency band that I am interested in is 0.01-0.2 Hz.
Regarding measurements, I am interested in computing (1) the signal’s temporal autocorrelation in the time-domain, and (2) the slope of a linear least-square fit in the log-log transfor... |
I performed variable-length LZW encoding in Matlab on a large set of text where my dictionary looks like this (size = 28):
dictionary = {'#', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', ' '};
and I calculated the average co... |
I am trying to convert my project from using FFTW to pffft. I only need to call the following two functions:
int N = 1024;
fftwf_plan planf = fftwf_plan_dft_r2c_1d(N, (float*)in, (fftwf_complex*)out, flags);
fftwf_plan planb = fftwf_plan_dft_c2r_1d(N, (fftwf_complex*)in, (float*)out, flags);
After reading the document... |
I am seeking an equation I can apply to provide a score based on a measurable ability rating.
It would be great to understand how the equation works so I can alter the curvature of this flexibly based on different scoring matrix.
|
I've discovered that such convolution can be further sped because of symmetric coefficients but I'm not able to get it right.
The filter is a low pass filter at 11025Hz for 44100Hz, with 461 taps.
The convolution that skips half the taps, that works:
public float ProcessHalf(float input)
{
var length = H.Length;
... |
I'm trying to implement a fractionally spaced equalizer to mitigate the effect of ISI on the signal. The block scheme that I'm following is:
I'm using the LMS algorithm to update the tap weights. In the scheme, the algorithm has $2$ phases: the training phase, in which a known training sequence is used and the iterati... |
This may be irrelevant for many people but I'm asking this question because I don't need to do these things in real time, I don't care if modifying a 1-minute sound recording takes 5 minutes to process. My question has two parts.
#1. Conventional implementations of sine or cosine functions expect the argument to be in ... |
A germanium APD (with $x= 1.0$) operates at a wavelength of $1.35μm$ where its responsivity is $0.45AW^{-1} $. The dark current is $200nA$ at the operating temperature of $250K$ and the device capacitance is $3 pF$. Determine the maximum possible SNR when the incident optical power is $8 × 10^{-7} W$ and the post-detec... |
If I have a linear optimization problem to be solved, is it correct to use the FMINCON SOLVER? If not, why?
|
I am trying to implement doppler logging of the carrier frequency of a phase modulated satellite downlink signal. I tried implementing this using the "PLL Frequency Detector" block in GNUradio.
I re-created the example from PLL Frequency Detector as a starting point and noticed that it does not work as expected. The ou... |
In this post:
Compensating Loudspeaker frequency response in an audio signal
I derive the Wiener-Hopf equations for least squares equalization (and channel estimation if we swap Tx and Rx) from the convolution matrix. This is used to equalize a waveform from distortions receiver over a multipath channel or where simila... |
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 complex signal and if that is the reason it doesn't have any negative frequency components then why is it saying:
Fourier ... |
Recently I have been interested in the following:
6G for Connected Sky: A Vision for Integrating Terrestrial and Non-Terrestrial Networks
Space-Air-Ground Integrated 6G Wireless Communication Networks: A Review of Antenna Technologies and Application Scenarios
Towards 6G Non-Terrestrial Networks
This research is on i... |
My problem is the following, I have 3 curves/signals (1D) , the measure, the signal and the resolution of my detector: $\mathcal{M},\mathcal{S},\mathcal{R}$, knowing that : \begin{equation}\label{eq:four1}
\mathcal{M} = \mathcal{S} * \mathcal{R}
\end{equation}
with $*$ being the convolution product, and my goal is to f... |
I am currently working on a FMCW radar using a SDR I have done the simulations in python and am moving towards simulations on GNU radio. In python it was easy to generate a chirp, just use the scipy.signal.chirp function and give the necessary parameters as input. But in GNU radio while creating my own block I was told... |
I have knowledge in DSP and some basic knowledge of RF.
I wish to do a self-learning project that will incorporate the following:
signal processing implemented on an FPGA.
Interfacing the FPGA to an A2D, D2A, or both.
Some board design (for the FPGA, analog frontends, and interfaces)
Might add some MCU if needed.
Oth... |
I seek to calculate, mathematically, the unwindowed Short-Time Fourier Transform of
$$
\cos(2\pi f t + \phi)
$$
i.e. any arbitrary real-valued sine: any frequency, duration, phase shift, and number of samples. The expression should reflect practical use, in that it's how we'd sample a sine in code. In effect, something... |
Decoding algorithms for convolutional code, turbo code, ldpc code and so on, are usually evaluated in AWGN channel. They are finally used with other receiver modules in fading channels. The performance difference in AWGN channel between decoding algorithms may be small like 0.1, 0.2 or 0.5dB. The question is should I c... |
DRR (Direct-to-Reverberant Ratio) and Reverberation time (T60) are said to be two of the most important characteristics of sound in Reverberation. DRR is said to be ratio of the energies of the direct signal and its reverberations.
The question that I'm trying to figure out is if it is possible to calculate DRR from ei... |
I have dataset composed of a large number of images with a large size (i.e., 32x32px), and I'm trying to adapt a feature extraction framework which assumes that the input dataset is Multivariate Normal distributed.
My question is: is applying a 2D-FFT to the whole dataset a good way to transform the data-distribution t... |
I am trying to create a method in my real-time algorithm to measure the variation in time based on a simple technique to avoid a huge overhead in the processing on the hardware.
The first method I am defining is measuring the angle shift between features in the time series as you see in the following image. Is there a ... |
I'm really a begginer at Wavelet transform and I'm starting to use the pywt module.
I have some difficulties understanding the link between the following integral and the coefficients of the DWT:
$$ W(a) = \int_{- \infty}^{+ \infty}|T(a,b)|^2db $$
(where a is the scale, b the translation and T(a,b) is the wavelet trans... |
I am new to FMCW radar and trying to plot the transmit signal over time.
As you know, the transmitted signal is modelled as:
$$s(t) = cos(2\pi f_c t + \pi S^2),$$
where $S = BW/T_{chirp}$ is the slope, $BW$ is the bandwidth and $T_{chirp}$ is the time duration of a chirp. The model can be found here: https://springerpl... |
Given a frequency response plot where gain is 0dB up to Fc and after Fc gain increases linearly by factor K (example chart below):
I am seeking how to arrive at its IIR/FIR equations so it can be implemented in a DSP processor, where Fc and K are variables in the equations that can be changed in real time while proces... |
I am trying to implement an SDR transmitter and receiver based on the description here.
def sdr_transmitter(signal: np.ndarray, frequency: float, sample_period: float):
"""
Encode input signal in the form of IQ values to output signal.
"""
Is = signal[:, 0]
Qs = signal[:, 1]
t = np.arange(0, s... |
I am new to signal processing and I am unable to understand the concept of sampling frequency. This YouTube video presents 20Hz to 20kHz (Human Audio Spectrum) frequencies. When I reach the poisition of 8000Hz its a very sharp sound. On the other hand when I listen to these 16-bit PCM wav file which has a sampling freq... |
I have an FIR filter that is a low pass at 11025Hz for 44100Hz, 461 taps. The reference implementation, i.e. naive convolution, works as expected. Now I've written a vectorized implementation to take advantage of SIMD/AVX acceleration but there is something wrong with it.
From a hearing standpoint, both versions are al... |
I have an audio signal $g(t)$ composed by the sum of my original signal $f(t)$ and a delayed copy of itself:
$$g(t)=f(t)+f(t+\varepsilon)$$
My goal is to recover the original signal $f(t)$ knowing:
$g(t)$ from a .wav file
$\varepsilon$ from a spectral view in Audacity
So now we know it is roughly equal to $55\ ms$.
... |
I have an input signal of frequency 1000Hz. Sampling frequency=16kHz. I compute the FFT on 128 input samples and plot the magnitude spectrum. I am not doing the normalization by 128.
My two sided spectrum has magnitude value of 64 on bin frequency 1000Hz. The power spectrum and two sided power spectrum have magnitude v... |
I am working on an algorithm for dominant speaker selection in a closed proximity cluster of smartphones (iOS and Android) with arbitrary positions. The smartphones act as clients, and one of them serves as the server. The server performs dominant speaker selection on the RMS of each packet and applies a moving average... |
AutoEq (by Jaakko Pasanen) is an utility for headphone equalization. I'm trying to make a EQ converter for SuperEQ (source code for implementation found in DeadBeef), which can be found on few software as like Foobar2k Desktop/Mobile and DeaDBeeF (originally SuperEQ was made for Winamp by N. Shibata).
My "problem" is h... |
What is the audible level for digital audio dB units?
I was looking at a soundwave from an mp3 file. I am using the "Sonic Visualizer" app available on Linux. The amplitude is between ~ -0.1,0.1 in my file. I have already learned the amplitude is on [-1,1].
The soundwave is between ~ -40,-10 when I convert the soundwav... |
Let us assume a system with external disturbance to reject. The system that is used for controlling has vibrations, that we would like to avoid.
We assume moreover that the dynamics are known (10% error in frequencies and damping factor), either in a state-space model or transfer functions.
H2 control seems a classical... |
Pretty new on all this GNSS stuff, I'm just studying from scratch an acquisition unit based in time domain using a parallel FFT structure. Just like the image got from "Acquisition Strategies of GNSS Receiver" from Rafiullah Khan et al.
My main concern here is, why should we apply the complex conjugate of the FFT repl... |
Before switching to use sawtooth I was using sine wave but in sine wave high frequency content was not clearly visible, But I don't have any experience with using sawtooth waveforms. I am going to make a custom block from this code in GNU Radio so I won't be able to use scipy.signal.sawtooth or signal.chirp. as some li... |
I'm walking through the published solutions of my homework and I'm struggling interpreting them. In them I was given a random Gaussian process $\{X_t\}$ and a random variable
$$\{Y_t\} = X_t\cos(2\pi f_0t+\Theta), \quad \Theta \sim \mathcal{U}_{[0,2\pi]}, $$ i.e., $\Theta$ is a random phase.
It is also given that $S_x... |
Recently I've been learning about and implementing some adaptive beamforming schemes (particularly the SMI/Capon beamformer, and the Robust Capon Beamformer). I understand the mathematical derivations for them, but I'm struggling with the intuition behind how they work.
The SMI beamformer is the most basic, with array ... |
Are there any approaches to gauge how well a sound may sit together with other sounds in a mix?
I’m thinking about something similar to picking instruments that might go well together in a band. Probably that has been done subjectively throughout the history of music, but I’m wondering if there are any objective measur... |
I have the following code to calculate and plot fft. The data consists of voltage, current etc. sampled at 30 samples/sec.
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
def calculate_fft(data, sampling_rate):
N = len(data)
fft_output = np.fft.rfft(data) # Perform real fft
fft_... |
Consider I have a signal x which has N samples, N being a very large number.
Could I create y, the analytical signal of x, by taking y[i:i+8] = H(x[i:i+8]) while looping over i in increments of 8?
Like, moving a window over the signal and taking the hilbert transform of it by moving the window in steps of 8 each time.
... |
I am trying to decode an analogue signal, that is intended to be converted to a digital one and decoded as USART communication.
In the image shown the blue trace is the analogue signal, and the filtered (using a moving-average filter) signal is shown in red. The signal shown is sampled at 1 MHz (thus 1 us), but has a ... |
I'd like to cancel echoes from a Talk recorded in a large extremely reverberant auditorium. It's unintelligible as recorded, and I'm hoping to make it intelligible by echo cancellation.
Audio was taken from an immobile video recorder, the video showing exact positions of 2 PA speakers (the main sound source) and the m... |
It is a rather well-known fact, that measurement precision is limited by the 1/f noise of a signal [1]. One way to show this in a concise fashion, is to plot the Allan deviation of the signal. For sampling times roughly in excess of the 1/f noise corner frequency, the Allan deviation turns into a constant value, like i... |
I was wondering if anyone may know of any method for the construction of a 3D wavelet transform in matrix form? I've been able to build matrices to perform 1D & 2D transforms. Yet, am finding very little resources regarding the 3D case in the literature.
|
There is a matter that comes to my mind from time to time, now I describe it in detail.
Anyway I am a first year PhD student, doing research in the field of cognitive neuroscience, but yet I only have tangential knowledge regarding EEG and also signal processing. I have read a few papers and even few chapters of Steven... |
I have a system where I cross correlate recorded audio signals with several smaller generated signals to extract feature vectors that later I use in a kNN matching. The system works the way I want it but I feel like I am doing things inefficiently and repetitively. I was hoping to get a simplification of what I am doin... |
I have an ambisonic multitrack with several spatialized sound effects (I'm using 1st order ambisonics). However, I'd like to add some mono sources (e.g. narration) to my project. My initial thought was just to add the mono source to each channel with the same amplitude, but that doesn't seem reasonable when I see how t... |
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 each corner {(0,0), (10,0), (0,7), (10,7)} I placed a desktop computer with an AX210, collecting CSI from a router that wa... |
I'm wondering what's an algorithm I can use to segment shapes on a binary image. Below is an example of the wanted result:
Thanks
|
My question is about an example in Adaptive Filter Theory, Haykin 4th ed (refer figures 1.8 and 1.10 of Haykin). We want to determine the region for asymptotic stationarity of an AR process in the 2D space of $\rho_1$ and $\rho_2$. Process model (characteristic equation): $$1+a_1z^{-1}+a_2z^{-2}=0$$
For asymptotic stat... |
So I have a fundamental question (for which I can't find a good answer anywhere). Say we have two images (A and B) and their mixed image (C) as follows:
Now say that I've been given Image (A) and Image (C) or Image (B) and Image (C). What are some algorithmic methods that will allow me to separate Image A from Image C... |
When running the MATLAB QPSK transmitter and receiver example (found here: QPSK Tx and Rx Example) you can see on the plot of the spectrum that the bandwidth is ~80kHz.
If we double click on Bits Generation we can see how each frame is constructed.
For a symbol rate of 50kHz we get $\ T_s = 1/50000 $
From the setting... |
have a distorted (blurred image) and I perform several deconvolution algorithms on it to sharpen it (Richardson lucy, regularized inverse filter, tikhonov miller). And i want to measure each performance by calculating the MSE (mean square error). However I don’t have a reference or an ideal image where I can compare my... |
I have an experimental PSF (point spread function) of an optical system for remote sensing images.
However, it is asymmetrical and has some sidelobes as below.
And I want to perform deconvolution to sharpen the images.
Is it possible to use this PSF as it is to sharpen the images?
Or should there be some modifications... |
I am studying the DSSS method and I have a question. For example, the emitter and the receiver use a $c_1$ sequence for spreading of length $L$. An eavesdropper uses a $c_2 $sequence of length $L$. We have $c_1 \neq c_2$. The transmission parameters are known to the eavesdropper: modulation, bandwidth, carrier frequenc... |
I want to transform the continuous signal $$u(t)=u_0+\hat{u}\cdot \cos(2\pi \frac{t}{T_0})$$ to a discrete signal. The discrete signal should contain $N$ values and exactly $m$ periods (starting with $T_0$). Furthermore is given a (yet) undefined sampling period as $T_s$. How long must I sample this function? How can I... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.