instruction stringlengths 31 27k |
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While going through FFT I came to know that, shifting of phase in frequency domain results on shifting of time in time domain.
According to this, in wireless communications, from the transmitter side having 2 antennas,signal s1 transmitted from Ant 1 and phase shifted version of sig2 in frequency domain transmitted fro... |
Is there an analytic expression by which it is possible to calculate overshoot of step-response of second order IIR digital filter? I have tried to search through Mitra's signal processing book and through some other materials, but wasn't able to find it.
|
Suppose there is a DFT vector $\mathbf{X}$ with length N, which presents complex conjugate symmetry around its middle point, i.e., $X(1) = X(N-1)^*$, $X(2) = X(N - 2)^*$ and so forth. $X(0)$ and $X(N/2)$ are the DC and Nyquist frequency respectively, therefore are real numbers. The remaining elements are complex.
Now,... |
I'm processing audio signal sampled at 44.1 kHz. After some other processing, I need to filter the signal between ~5-50 Hz. Achieving this for a signal with such a high sampling frequency appears to be difficult. I would like the magnitude response to be nicely flat within the bass-band. No phase distortion is allowed.... |
Adobe Acrobat has this as a feature called ClearScan. While doing OCR it allows image enhancement, by smoothing irregularities on font outlines.
For example, this source:
turns to this:
Are there other tools with such feature, or public algorithms (Matlab/Python) that can smooth contours of arbitrary font-like object... |
I want to select a random sub-block of 8x8 out of an image 256x256. Is there an instruction that do this thing or i need to calculate it with a different approach. I found how to choose a galois field array out of a matrix but i think this is not in my case what i need.
|
I am trying to track small object in videos using LK
but the problem is, some time the object does not appear in the frames !
How can I track an object that does not appear in few frames ??
how can I approximate it is place automatically ,,,
I am trying to find the object using Optical flow LK ... but this techniqu... |
What does the spectrum of a sampled signal look like if one uses a zero-order-hold?
There is some information in:
Sampling theorem and Dirac comb, but I am wondering, how to apply this in practice.
Starting with an analytic spectrum I generated a time signal and recalculated the spectrum and it fits quite well. In a n... |
I have DSP in my curriculum. I kindly request suggestions on alternatives to MATLAB. Ideally, alternatives that are not as "heavy", megabyte-wise.
|
I'm a student studying communications engineering. I'm trying to understand why this particular laser diode is made for 155 Mbps and 622 Mbps. I'm thinking that the bitrate is entirely dependent upon the bandwidth of the photodiode. I can see from the datasheet that $f_c = 2 \text{ GHz}$ and so what I'm thinking is ... |
How I can approximate the signal $x(t)=0.001\,t^3 \exp(-0.1t)$ in the interval $[0,100]$ using a linear combination of the following functions:
$f_1(t)=A_1$
$f_2(t)=A_2\cos(0.05t)$
$f_3(t)=A_3\cos(0.1t)$
$f_4(t)=A_4\cos(0.2t+1)\exp(-0.2t)$
$f_5(t)=A_5\,t^3$
I try to write a matlab code. Is this correct?
t=[0:100];
x_t=... |
When we perform DCT transform using matlab:
number_of_sample_data = 100;
f=0.1; %frequency
fs=1; %sampling rate
phi_0=0
t=0:1/fs:((number_of_sample_data-1)*1/fs); %generate 100 samples
x=sin(2*pi*f*t+phi_0);
dct_transform=dct(x); %perform discrete cosine transform
figure(1), stem(dct_transform);
this piece of c... |
Suppose there is a DFT vector $\mathbf{X}$ with length N, which presents complex conjugate symmetry around its middle point, i.e., $X(1) = X(N-1)^*$, $X(2) = X(N - 2)^*$ and so forth. $X(0)$ and $X(N/2)$ are the DC and Nyquist frequency respectively, therefore are real numbers. The remaining elements are complex.
Now,... |
I want to found how many elements in an array is not equal to zero. I use this code:
y=sum(img_dct~=0);
z=sum(y);
Can i make this with a different way? Is there a matlab instruction like 'numel' that can do the job?
|
I would like to start learning audio signal processing. There are numerous books online and academic papers all of which seem to skip the fundamentals of the topic.
I would like to know a rough roadmap, so to speak, to follow in order to successfully learn audio signal processing.
I have read that calculus is the first... |
I am doing 1D wavelet decomposition and I am particularly interested in parts at the border of the signal. These parts are affected by boundary effects.
I know that some of the methods to extend the signal are periodic and reflexion, but none of these solutions are acceptable in my case.
I would like to extend the sig... |
I have this assignment that I can't figure how to solve.
I have a sound.wav human-voice file, and use matlab add-random-noise (monotonic)
Goal: to remove the noise from the sound (and the sound from the noise)
What I've done so far is to read the file and then add the noise.
I then do an fft.
Now I need to analyze the ... |
I am working on a board that has no antialisaing filter at the input of the ADC. I have option to I implement my own filter using RC + Opamp circuit. But is it also possible to implement Anti Aliasing filter after sampling by ADC and processing in Digital domain: a digital Anti aliasing filter?
|
I have DSP in my academics and while going through the video lectures i am stuck regarding power of periodic signal.
Its mentioned as
$$P_{\text{avg}}= \frac{1}{N}\sum_{n=0}^{N-1}|x(n)|^2$$
my doubt is why we have to mention $|x(n)|$ as square ?
Note: I am having format issues please edit my Question and put it in for... |
So if I have an image of the size: 1920×1080 and I want to apply a convolution filter of 3x3. Take the formula for DFT $N^2$ and FFT $N \log N$. What should I fill in for N in this case?
|
I am approaching to the Oxford Buildings dataset which contains already computed SIFT descriptors from affine detected keypoint locations.
Usually SIFT detector provides to its detected keypoints with scale and orientation information.
In the case of affine keypoints is clear that they don't have a single scale paramet... |
Suppose that I have a sensor that can acquire samples $X[k]$ of the Fourier transform of an unknown signal $Y[t]$. An example is MRI, where the acquired data is in $k-$space. Now suppose that the unknown signal $Y[t]$ is known to be real and non-negative. My question is: is there a principled way to incorporate this kn... |
I would like to ask about this function in OpenCV:
cvTermCriteria( CV_TERMCRIT_ITER | CV_TERMCRIT_EPS, 20, .3 )
How do I get more accurate results - do I need to increase the value of epsilon or decrease it?
|
I have been looking at trying to use wavelets for multichannel audio dynamic range processor. I am in the very early stages of trying to get decomposition and reconstruction working. In this thesis, it is suggested that a multiresolution dwt can be calculated using a tree of complementary filters. Being a hands-on pers... |
I am aware of the common types of windows, (Hamming, Hanning, Kaiser, Tukey, etc etc). However while many books describe them - almost none tell me just how exactly they were derived.
What is so holy about the hamming window? What about the hanning? I understand that they all play on the ratio of mainlobe width VS sid... |
In DTFT of a signal, the spectrum of a sequence is periodic with period $2\pi$ and all the information needed for derivation of the original signal from its spectrum is contained in $\pi <\omega <\pi$.
But , why do they integrate over $2\pi$ and not from $-\infty$ to $+\infty$ , as in continuous Fourier transform in in... |
I recently realized that FFT's aren't perfect. Meaning if I take a signal and then take it's FFT, and then do an inverse FFT, the resulting output isn't exactly the same as the input. Here's an image to show you what I mean :
I think the image is fairly self explanatory. The IFFT signal is just an inverse transform of ... |
What useful information i can take from the coefficient intensity maping after performing DCT transform?
|
Is it true that convolving a 3x3 matrix and a Full HD (1920×1080) image is slower with FFT, than with normal for-loops? Because you have to do zeropadding to get to a power of 2? (with the traditional Cooley-Tukey FFT for example)
Because when using the FFT, you have to zeropad the 3x3 kernel as well...
log(1920*1080)/... |
This question is a continuation of the discussion at How can a linear operator on DFT vector produce the same vector using only half of the DFT vector?, where the higher level motivation is better explained, in case there is interest.
Question:
How to take the positive frequencies from an hermitian symmetric DFT vector... |
I know this question has been asked to hell and back from many people, and that it will probably get downvoted until it's deleted, but please bear with me.
I am designing a sound engine for one of my projects, which needs to support low-pass filtering (no other filtering required, so no need for extremely robust equali... |
I would like to convert a signal to frequency domain. The desired frequency range is 0.1 Hz to 1 Hz and the frequency resolution is 0.01 Hz.
With the sampling rate of 30 Hz, FFT gives the frequency components up to 15 Hz.
Raising the sampling rate gives better frequency resolution. However, FFT gives wider frequency ... |
There is a statement regarding the Nyquist frequency in one of my textbooks which I don't quite follow. I would appreciate it if someone could clarify it for me.
Now, the way I understand it - if we sample a signal with frequency $f_{s}$, then the highest possible signal frequency which we can reconstruct without any ... |
Right now I simply do this (pseudocode)
for freq in freqs:
for i in len(samples):
samples[i] += sin(...)
Is there a better way? This is for outputting to a 16-bit WAV file, using C on an ARM7 device. The frequencies are actually the centers of FFT bins for a particular bin size.
|
Calculate the amount of operations you need for the Fast Fourier Transform.
Take $N=2048 \times 2048$
$N\dfrac{\log(N)}{\log(2)}$
$\dfrac{\log(2048 \times 2048)}{\log(2)}$ is 22.
$(2048 \times 2048) \dfrac{\log(2048 \times 2048)}{\log(2)}$ is 92274688.
But does $92274688$ stand for total operations or $92274688$ adds A... |
I would like to estimate the impulse response of a simple environment (room, two speakers, one microphone). I am aware of the issues/limitations of working with "near" LTI systems. That said, I have a rather basic question regarding the mechanics of performing cross-correlation using audio which has been recorded in my... |
I'm looking for some suggestions and wondered if anyone had any ideas.
I have just completed a project in Speech Recognition using MFCC, Dynamic Time Warping and Hidden Markov Models etc.. (Some of you will probably remember me, and, how annoying I was!!) But I managed to complete it.
It's the summer now and I'm lookin... |
I would like to ask a theoretical question concerning the Dirac function. The Fourier Transform of the Dirac function is the value 1 (DC) for every frequency. If we consider the Sampling Theorem, we have to find a maximum frequency in the signal $ \ f_{max} $, so that we can sample with $ \ f_s \ge \ 2f_{max}$. But as ... |
What are the salient differences between Lumped and Distributed systems? In what contexts are distributed systems the appropriate model and in what are lumped systems the appropriate model?
Also, Lumped systems are said to be described by ordinary differential equations while the latter is said to be described by parti... |
I have a really simple question regarding this tutorial I found on Gabor filters.
Check the very beginning section, equations (1), (2), (3) and (4). Is there any chance that equation (4) is missing an = and should be written as follows?
e^jθ * s(t) = e^j(2πfot+θ) = [sin(2πfot + θ), j cos(2πfot + θ)]
^
... |
I'm having a trouble here. I'm supposed to learn Frobenius canonical representation form for finding statespace matrices, but I found many different forms.
Let's suppose we have a system with this transfer function: $$H(s) = \frac {b_ns^n + b_{n-1}s^{n-1}+ \cdots + b_1s+b_0}{a_ns^n+a_{n-1}s^{s-1}+ \dots + a_1 s +a_0}$$... |
Define moving average process $y_t := 0.5 x_t + 0.5 x_{t-1}$ where $x_t := e^{i2 \pi t}$. Its frequency response is then:
$$H(f) = 0.5 + 0.5 e^{-i2\pi f}$$
Recall that the frequency response in polar notation is:
$$H(f) = G(f)e^{i \theta}$$
where $G(f)$ is the gain function. We then have that:
$$ H(f) = 0.5 \big( e^{-i... |
I am looking for Lossless compression algorithm for hyperspectral imaging. The only one that I found was LPVQ.
Do you know other algorithms? I am looking for pseudocode or matlab code.
Thanks
|
I found out today about Google +'s image search feature. It allows users to perform a text-based search for objects within their picture library. I was instantly curious to know how this feature works. Does anyone know? Are Google using anonymous usage patterns from Google Images to build a computer vision library of C... |
The Nyquist formula for digitally sampling and recovering a continuous waveform is well known. Are there any mathematical formulas that show that it is computationally infeasible (or impossible) to reconstruct a waveform if you go below a certain sampling frequency?
|
I have a signal sampled from a hardware, s. I would like to compute the coherence of the sampled signal given a single frequency, f. Below are the approaches I can think of.
Base on f generate a synthetic signal and compute the coherence of s and the synthetic signal.
Use SNR similar approach with frequency range [f ... |
I'm writing program (Qt widgets/c++) for removing noise from images. As denoising method, i selected non local means method. This method has incredible quality of restored images (that's why it's the only denoising method in OpenCV), but has huge computation cost, so i made a lot of modified variants of this method (so... |
I do understand the mathematics behind digital beamforming but I am not sure how such systems are practically implemented. For example, in a typical wideband FMCW radar operating in S-band, the (baseband) pulse bandwidth can be as large as 500MHz. To digitize this signal, you need high-speed ADCs, typically 1GHz sampli... |
Sorry for the long question, but I'm struggling to implement something related to this question. Your help would be appreciated.
Background
Notation: In the sequel, the uppercase letters represent frequency domain vectors, while lowercase represent time-domain.
Suppose I have two $N$-length hermitian symmetric DFT vect... |
I would like to compare the positions of the same object in 2 different pictures and get the difference between the positions in in terms of x and y coordinates.Suppose I have a picture with a square figure on it at the centre and then I reposition the square to the top right corner.I would like to find by what distanc... |
I am reading
The Wavelet Tutorial
Part III
MULTIRESOLUTION ANALYSIS
&
THE CONTINUOUS WAVELET TRANSFORM
by
Robi Polikar
The author explains about the following fig and says;
Note that boxes have a certain non-zero area, which implies that the
value of a particular point in the time-frequency plane cannot be
known... |
Our current project requires us to do some analysis using Wavelet Transform. Can anybody suggest me a practical book, preferably with MATLAB or C examples.
I am currently reading some tutorials, but it is not giving me a feeling as I have for Fourier transform. I need a book having many practical examples with source ... |
The problem I have can be seen in the context of DoA estimation or blind source signal separation and similar fields, where several source signals are observed by several antennas (or by an antenna array, respectively).
The basic model is something like
$$\mathbf{y}(t) = \sum_{i=1}^{n_s} s_i \mathbf{a}\left(\theta _i\r... |
I have an image as attached
The blue to yellow to red points are the points of interest the algorithm found, while the pink points are the radius per point. This maps pretty fine, but the issue I am having is that I need to find the area covered by this, but there are usually small holes, or when the direction changes... |
Assume there are 11 signals. These signals are very similar to each other in both time and frequency domains. (And the similarity between them is not random; they are similar because they have somehow a common source. Actually they are well-correlated.) All these signals have the same number of samples. And I have acce... |
From the IIR filter flow graph below i don't understand how the transfer function is calculated in every node:
|
I doubt because you have 9 multiplications and you are adding 9 numbers together, when using a 3x3 convolution matrix.
Adding 9 numbers: 1+2+3+4+5+6+7+8+9
We are performing 8 additions as we repeat the operation of 'adding' 8 times (8 times a '+' sign).
We can say there are 9 additions as well, if you would accept a d... |
The uncertainty principle is usually stated as a relationship between a continuous signal and that signal's Fourier transform, and says that
$$
\int_{-\infty}^{\infty} \! x^2 f(x) \ \mathrm{dx} \int_{-\infty}^{\infty} \! \xi^2 \hat{f}(\xi) \ \mathrm{d\xi} \ge \frac{1}{16\pi^2}.
$$
Apparently it is somewhat difficult to... |
I want to achieve something like this https://soundcloud.com/user7421656/sonicworx-isolate-preview .
I've researched it and a few papers mention the use of "descriptors" on the audio and use thresholds on the descriptors to determine singing sources. But before I dive in and go hard out on how these people achieved it,... |
For the preliminary part of a lab I had to do, I was asked the following question:
I get how to do 1.1, but with 1.2, I really don't get what's going on; I really would've thought that the resolution bandwidth would be equal to the bandwidth of the low-pass filter. Furthermore, I'm pretty sure a spectrum analyser has... |
I have some (well lots) of data signals which are measurements of current pulses. The current pulses are the result of spark breakdowns (20 kV + 700 pF capacitor so quite energetic) and my problem is that noise, and displacement current signals are clouding the underlying current pulse.
The noise and the displacement c... |
I have designed 9 IIR bandpass filters (chebyshev type 1, order 4) using fdatool in Matlab. Then I use a and b filter coefficients to apply it on differential equation. So, my question is how to apply (real-time) gain of each bandpass filter using sliders? ( how to add gain or loss to certain filter?)
Here is my code i... |
I want some data (images that have only shift) to test on xuvtools or Microsoft ICE and my own software.
Is there any available?
|
I'm new to wave problems, so excuse my simplified words.
I have a signal consists of high range of frequencies . I applied a Band-pass filter to this signal and I have been able to separate it to bands of specific frequencies.
The problem that I want to solve is as follows:
Each band have a lot of individual waves of V... |
I have a Virtex 6 FPGA running at 200MHz with ADC/DACs on it. I have been converting a WiFi signal (2462MHz) down to a more reasonable IF of 25MHz, sampling, running the signal through taps, tweaking them, and mixing back up. This all works fine.
My issue is that since I am mixing down and sampling at a lower rate, I... |
I wish to use trainCascadeObjectDetector to train on new objects (other than faces); I have the Computer Vision Toolkit installed; but this function trainCascadeObjectDetector seems to be missing from my system. Did I miss something during installation? Or has this been removed from R2012b?
|
I have to design an 8th-order IIR filter with the following transfer function magnitude response as a specification:
I use "ellip" function from matlab to calculate the unquantised coefficient set:
Then i implement the filter using a cascade of second-order sections using "tf2sos" matlab function:
And then i quantiz... |
My signal graph is as follows
I have < 10 reputation, thus cannot post the photo...
The graph are simply roughly the series of -5, 0, +5, 0, -5, 0, +5, 0.... but with sawtooth-like small peaks around the prominent peaks.
I am going to do the peak detection. But what I need to count is the "prominent peaks".
i.e. The "... |
"Using a state-of-the-art atomic force microscope, the scientists have taken the first atom-by-atom pictures, including images of the chemical bonds between atoms, clearly depicting how a molecule's structure changed during a reaction. Until now, scientists have only been able to infer this type of information from spe... |
I've read many questions on SO, and frankly, each one of them is not describing any particular way to go about it. Some say "do FFT" and some say "zero crossing" etc. But I've only gone as far as understanding that the digital audio input consists of an array of amplitudes for a particular frequency and well.. Don't re... |
The primary source lists Butterworth polynomials in s-domain and provides a link to bilinear transform for digital implementation. But, who needs analog specification in our digital world? Why should everybody get involved into the quite laborious bilinear transform, which, additionally requires frequency pre-warping? ... |
I need a tool or code for extract not blurry images from video (it can be used for panorama or SFM building from video)
something like
http://research.microsoft.com/en-us/um/redmond/groups/ivm/sharppanoramas/
(It is worth noting that software for building panorama from video is already exist, but I don't know why they ... |
I'm using a set of features extracted from a signal for classifying the data window with KNN algorithm. Since the features have different value ranges, their influence on distance calculation is different when you use euclidean distance in KNN.
To equalize the influence of these features on classification:
I can norma... |
related to Filtering voice signal from randomly added frequencies
I'm trying to create a simple low pass filter but i'm not sure what is wrong.
my code:
[y,Fs]=wavread('sound.wav');
m = length(y); %30586
Fc = 500; %% frequency cut
n = [0:m-1]; %% kernel length / samples
Fs = Fs; %22000 ... |
Can you tell me whether the following signal is a energy or power signal?
$$
x(n) = e^{j (n \pi/2 + \pi/8) }
$$
I've solved it and found it as it was neither power nor energy signal was that right?
|
I went through this material on Sampling theorem. http://www.wescottdesign.com/articles/Sampling/sampling.html
It uses a powerline signal example and concludes that if a signal is cyclic and repeating over a period N then you could sample the signal at lesser than N samples per second.In the example he shows for a 60Hz... |
I want to sample two signals, S and R and later do IQ demodulation on these.
I am multiplying S with R and I also want to multiply S with a 90 degree phase shifted version of R by shifting the samples in R so I get a 90 degree phase shift.
The problem I encounter with this is that unless I have a sampling rate that is ... |
suppose we have a cascade realization of a transfer function of a higher order.
What difference does it make if the order of the transfer function is an Even or an Odd number?
|
I have a set of recordings sampled at 16khz, but some of them are upsampled from 11khz and some from 8khz. Quite some of the recordings are noisy. What is the best way to classify the recordings according to the original bandwidth?
I know some people are using GMM classifiers for detection. A paper on the subject is DE... |
Do you guys know good DSP related websited and blog posts?
I know that for example there is this site called Minutify:
http://www.minutify.com
which is blog posts regarding all areas of electrical engineering including DSP.
Do you guys know of similar resources?
|
Background
I am working to identify and isolate each human limb of a known person, in pose, in an image which is relatively noisy. It should also be noted that the image is a snapshot extracted from a video (which can be utilized in this task).
The end result ideally would be a bunch of polygon estimates of each body ... |
@Michael C. Grant wrote that "the cost of FFTW isn't an easy formula based on log_2 anymore."
But the Wikipedia article says that the FFTW "can compute transforms of real and complex-valued arrays of arbitrary size and dimension in O(n log n) time."
So can it compute 1 forward FFT with the size 1920*1080? in kNlog(N)/l... |
In the filter graph below:
where circle with 'X' inside is a multiplication
circle with 'Σ' inside addition
and the triangle is a delay element
What could be the values x(k) in this type of filter? There is a rule? There is a range? I can understand the matrix of coefficients but i don't know about the x(k) values.
|
If you want to compute a convolution with a DFT/FFT, you will have to do a DFT on the image and a DFT on the kernel.
And you will need to multiply the spectrum of the image with the spectrum of the kernel.
Is it correct that the multiplications in the fourier domain are complex multiplications? So, that those point-w... |
I was reading a paper related to privacy where they perform fourier transformation of a time series data and retain few coefficients of the FFT. Then they apply some noise to these coefficients. These noisy coefficients are zero padded. Finally inverse DFT is applied to obtain the original data which is not exactly equ... |
I've built a simple device, which sends readings from a pulse sensor to a PC.
I get these data:
What technique or algorithm can I use in order to calculate the pulse rate (beats per minute) from these data?
Update 1 (03.06.2013 21:01 MSK): The time series represents my heart beat during approx. 3 minutes. According to... |
Someone wrote "The algorithm that Cooley and Tukey presented in their classic paper (Math. Comp. 19 (1965), 297-301. http://dx.doi.org/10.1090/S0025-5718-1965-0178586-1) can be applied to any composite length. The performance advantages are greatest for highly composite lengths, of which powers-of-2 are one example, a... |
I know there are 4 types of FIR filters with linear phase, i.e. constant group delay: (M = length of impulse response)
Impulse response symmetrical, M = odd
Imp. resp. symmetrical, M = even
Imp. resp. anti-symmetrical, M = odd
Imp. resp. anti-symmetrical, M = even
each with its traits. Which of these types is most co... |
The wavelet transform informs what all derived wavelets (from mother wavelets) with different scales at different point of time , are present (along with the associated strength) in my original signal. I am not able to understand how do I now correlate it with FFT that simply gives what all sine and cosine waves are... |
I have an audio buffer with 1024 samples per second.
The sample rate is 44100.
I am trying to identify the frequency tones.
Using the Gorzel algorithm, I can get the frequency but it's not that accurate.
I was trying some other scope program and I got better results with the same hardware.
How can I decrease the id-ban... |
I have seen many times, including in a post on this forum, that it is recommended to have unity gain at DC for a lowpass filter. I would like to now the mathematical explanation.
|
I am implementing a simple LPF in Java.
But I have problems in choosing the value of ALPHA.
public class LowPassFilter {
/*
* Time smoothing constant for low-pass filter 0 ≤ α ≤ 1 ; a smaller value
* basically means more smoothing See:
* http://en.wikipedia.org/wiki/Low-pass_filter#Discrete-time_rea... |
I have this confusion. I was reading this paper. It says
lets say I have a n dimensional vector X and I take its DFT i.e DFT(X). Then the n Fourier coefficients have the same L2 norm as X. How is it true? I tried on a vector
X = ones(100,1). Applied DFT to X i.e, DFT(X). But norms are not equal
|
I have more general question about the extended Kalman filter usage. What is not clear to me is why the EKF uses non-linear functions $f$ and $h$ for state prediction and estimate, while in other places the Jacobian of these functions is used.
Why the following is never used?
First calculate the linearized state and ... |
For seismological application, I am playing with an elliptical filter, and once I have both sets of feedback and feedforward co-efficients, how do I make it so that I can plot the frequency response of the system? Can I also use the same technique to make the frequency response for a bessel?
I know that I can take the ... |
I am watching the following video on software defined radio and at the beginning the narrator points out some "whistlers" on the spectrum display and says maybe they are caused by an "annason". He goes on to say that he knows "commercial annasons scan at a slower rate than the whistlers". What is an "annason". I don't ... |
The frequency domain is allegedly preferred because it replaces convolution of complexity $n^2$ with a diagonal matrix multiplication. Yet, I see that in z-domain we have multiplication of polynomials, $(a_0z+a_1z^{-1}+a_2z^{-2}+\ldots)(b_0z+b_1z^{-1}+b_2z^{-2}+\ldots)$, which is, despite its name, is nothing more than... |
I am working in digital image restoration field, recently i am studying a paper Blur-Kernel Estimation from Spectral Irregularities, in this paper i have got some terms, which i am unable to understand, can anyone please provide me specific description of these terms. [i have already google it, but i didn't get satisfa... |
What does it mean by leakage in case of digital filters? My specific question is about the frequency domain adaptive filter function provided in the Matlab DSP toolkit, accessed as adaptfilt.fdaf. It has a parameter called LEAKAGE, but I am not sure what exactly does it represent or how it affects the filter response.
... |
I'm trying to do global registration algorithm for panorama like described
here. But I don't understand how they deal with false pairs.
Also if expand the system
u1*I*P1=u1*I => P1=I
u2*I*P2=u2*A21*P1 =>P2=A21*P1
u(i) coefficients are reduced? Or I interpret system of equations wrong?
|
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