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I'm analyzing guitar string plucks and sustains. I'm having good success with auto correlation using FFT's. Now I'd like to detect plucks while the string is still vibrating. Since I already am periodically taking FFT's to find the pitch, I thought maybe I can take advantage of the fft results and look for changes t... |
Does converting zeros into ones and ones into zeros in the input stream affect the decoding result? Empirically I have seen that it does not affect, decoding $[0 1 0 1 \ldots]$ and $[1 0 1 0 \ldots]$ produce the same output stream. But I am not sure if it is true or not, and I am looking for a theoretical proof.
Why I ... |
With a 1/2-rate convolutional encoder, $n$ bits are encoded into $2n$ symbols.
Assume we have a long encoded stream such as $[... s_0, s_1, s_2, s_3, s_4, s_5, s_6, s_7, s_8, s_9, ..., s_{100}, ...]$. I want to extract a small portion from the middle of it, and decode it.
Starting from the symbol $s_1$, the data is de... |
This sample image:
is warped on the left side.
I don't want to dewarp, but just to remove shadow gradient (caused by book's spine). I guess gradient can be calculated from upper part of the image and that information can be used for reconstruction.
First I thought to apply some layer transformation in Photoshop. I t... |
In paper Human identification using gaits Section 3.2, the authors explain how to represent a 3D image (x,y,t) into 2D image with (x,t) ; (y,t) denoted 1D signals. I have a conceptual doubt which is in my case I have a matrix (x,y) represent the centroid of the motion- a pixel point from one frame to the next. So, if w... |
For background information, see "Some background" further down.
I have a list that looks like this:
Start-Time-In-Seconds;End-Time-In-Seconds
1;2
4;6
12;15
...
This works together with a wave file by acting as a cutlist. So the desired parts are 1->2, 4->6, 12->15, ...
If the distance between End-Time-In-Seconds of th... |
Given a discrete real signal $ f_{re}(t) $ the (complex) analytic signal is given by:
$ x(t) = f_{re}(t) + j*f_{im}(t) $.
I want to calculate $f_{im}(t)$: the quadrature by convolving with a Hilbert kernel of size 2*n+1:
$f_{im}(t) = H*f_{re}(t)$
$H=[H_{-n},H_{-n+1},..,H_0,H_{n-1},H_n]$
According to "Complex seismic tr... |
I understand that a digital signal processor consist of multiple MAD (muliply add units), which execute in parallel to implement a difference equation, like this one:
$$ y[n]=10y[n-1] + 45y[n-2] + 45y[n-4]+ 67x[n]$$
and this one;
$$ y[n]=10x[n-1] + 45x[n-2] + 45x[n-4]+ 67x[n]$$
My question is do I need to be careful a... |
I've implemented a soft-decoder for DQPSK using the wonderful answers I received here:
How to soft decode DQPSK?
To get the soft-decoder working properly I needed to precode the data I was sending out. I implemented the precoder mentioned in this paper:
$I_k=\overline{u_k \oplus v_k}*(u_k \oplus I_{k-1})+(u_k \oplus v... |
Is it possible to dynamically filter a signal in realtime on a microcontroller?
What I mean by dynamically is to change the cut off frequency of the filter on the fly.
I have some DSP knowledge and realize that I probably do not have the computational power to do an FFT on the fly. Instead I should be looking at crea... |
I'd like to ask when we apply Wavelet transform on 1-D Signal in Matlab it simply stores both Approximations and Details into a single row which is quite annoying for me,
have a look,
Where,
X = original Signal
cDn = Details coefficients
cAn = Approximations
This is how Matlab do it,
Suppose I have a random sequence,
... |
I have an arbitrary shape defined by a binary mask (gray = shape, black = background).
I would like to find a largest possible rectangle containing only gray pixels (such rectangle is pictured in yellow):
The shape is always "one piece" but it is not necessarily convex (not all point pairs on the shape's boundary can ... |
Given an hidden law $$I(t)=\frac{1}{2}[A+B.cos(2\pi\nu_0t+\phi_0)]$$ I observe its signal with 256 samples and compute its FFT over this interval, and represent the FFT result from 0 to 1 (normalised frequency).
I get a figure whose pic is at 0.83.
How can I retreive A,B and $\phi_0$ from this graphics ?
A second que... |
I'm trying to understand how the PSD is calculated. I've looked in a few of my Communication Engineering textbooks but to no avail. I've also looked online. Wikipedia seems to have the best explanation; however, I get lost at the part where they decide to make the CDF (Cumulative Distrubution Function) and then for ... |
I am trying to understand different filters' and other things' effects on Radon Transform by using MATLAB. First I upload an image, then take its Radon transform with radon function and then reconstruct it with iradon function.
Now I wanted to see the difference between undersampling the projection data by reducing the... |
I've written a quick test app that uses the Goertzel algorithm to determine if a given frequency is present in the signal. This is to pick up DTMF tones and various other signals. The app appears to be working. I'm using the 'magnitude squared' approach in my final stage.
http://www.embedded.com/design/configurable-sys... |
How would would one approximately reconstruct the branches in a photo of a tree, where portions of the branches are covered by leaves?
I can extract the visible portions of the branches by threshholding then opening with line segments at a few different angles. But how would I then (approximately) fill in the spaces t... |
I'm working with a Continuous Hidden Markov Model, and using the Viterbi Decoder which finds the best possible path for a given sequence. Here is how my algorithm works:
1) Process the (input) .wav speech signal
2) Extract the MFCC Coefficients (13)
3) Use these values to train the HMM
4) Execute the Viterbi Decoder
... |
I'm trying to get a grip on Wavelets. I've read "Wavelets, Their Friends, and What They Can Do for You" which lead me to an implementation of the discrete DWT with filter banks. Basically, I'm using the equations
$$
a_{j,k} = \left[\tilde{H} * a_{j+1}\right](2k)\\
d_{j,k} = \left[\tilde{G} * a_{j+1}\right](2k)
$$
which... |
I'm doing autocorrelation (via fft) on pure, synthetic generated sinusoids and getting unexpected jitter in the results. The jitter depend on where in the sine the signal buffer is started. I get the correct results if I start the buffer at 0 and 180 degrees of a sine wave, and get the most error at 90 and 270 degree... |
I would like to know the theoretical difference or relationship between noise and artifact in images, I barely know the relation between noise and distributions, but I'd like a deep explanation if it is possible related to medical imaging field.
Do you have a link, paper at hand?
|
I'm learning about Directional Filter Banks for my Thesis about Image Enhancement. I read it from some papers (Bamberger(1992) and Park(2004)) but I still cannot understand it clearly in detail. Could anyone here please explain it to me the process? Does it applied on Frequency domain or Spatial domain?
Thank you very ... |
How do those matrices work? Do I need to multiple every single pixel? How about the upperleft, upperright, bottomleft and bottomleft pixels where there's no surrounding pixel? And does the matrix work from left to right and from up to bottom or from up to bottom first and then left to right?
Why does this kernel (Edge ... |
I've got in total 6 images, from 2 cameras (thus 3 per camera) storing 16 bit data.
What I need to feedback to the user is like some sort of sharpness coefficient, preferably live while he is adjusting the focus of the whole system (since its looking into the eyes, it depends on the dioptres of the patient).
What I a... |
I have a very specific application which requires to use the complex Morlet wavelet (or Gabor wavelet, if that's the name you use). I currently use the convolution theorem to compute wavelets transforms, but I'm reading everywhere that direct wavelet transforms are more computer efficient, because of the lifting scheme... |
It has always been said that $F(0)$ is the "DC component" in fourier transform. However, I don't get what it means to say that $F(0)$ is "DC" in the context of image processing.
The zero in this case just meant zero frequency, and hence no changes isn't it? Then in the context of image processing, how should I imagine... |
Why is the least squares cost function used in adaptive noise cancellation with the recursive least squares (RLS) algorithm, but the mean squared error used in signal estimation?
For an ergodic source (where time and ensemble averages should be the same) I would have thought the choice was arbitrary.
From my notes: LM... |
How would I extract the circular area of a binary image which looks like:
The two rods emerging from the side of the circle are noise.
I know of the hough transform in Matlab. However, I am using R and can't seem to find anything similar.
Ideas anyone?
|
I'm just learning about Fourier Transforms and as an input I'm using a WAV file (Matlab) and taking one channel of it and performing a quick Fourier transform. I've zero padded the input, as I've been told that it gives a better frequency resolution. I've done this and I see an identical looking graph apart from that t... |
I am looking for a technique for measure the quality of my denoise filter, is the SNR formula useful for that purpose?
My problem is, I have an image with noise, I apply the "adaptive median filter", how to know if the noise has decreased?
|
I'm comparing frequency spectrum of FSK, ASK, QPSK, and MSK. And I'm asked which has the least and greatest spectral coverage. Could someone enlighten me on how to get it?
|
Is it because noise manifests itself in the transmitted signal's amplitude?
|
For an image has a simulated horizontal motion blur on it, is it reasonable for someone to say that the suggested shape for the point-spread function resulting in this motion blur is a rectangular pulse aligned in the direction of motion?
If so, what is an explanation for this?
|
I'm using the 2D Fast Hartley Transform to do fast correlation of two images in the frequency domain, which is the equivalent of NCC (normalized cross correlation) in the spatial domain.
However, with NCC, I can get a confidence metric that gives me an idea of how strong the correlation is at a certain offset. In the f... |
I took an image, did an fft2 to it in Matlab and then squared the abs of the fourier transform to get the power spectrum.
Something I notice about the power spectrum however is that there are vertical lines in it like this:
This is the original image which the power spectrum was calculated from, for reference:
What a... |
I have a time varying discrete signal x(t) sampled at 5ms rate.
I need to find the amplitude of the 20 Hz frequency component for each sample.
What I do today is that for each sample I do a Short-time Fourier Transform of the data in a window around that sample. Then I read the amplitude for the 20 Hz frequency compone... |
I have implemented a texture recognition algorithm in MATLAB and it works well. Now, my next step is to summarize with the accuracy percentage. Now, I would like to summarize my work and attribute an accuracy to my algorithm.
I have around 1000 images and only one training image. The feature vectors are available for a... |
It's known that the RLS filter converges faster than the LMS filter in general, but that if you're tracking time varying parameters the LMS algorithm can perform better.
My question is under what conditions does this hold? I understand that the LMS filter is like a point estimate, but the RLS uses more data - when wou... |
I have a Xilinx FPGA running at 200MHz with an ADC and DAC on board. I am taking a 2462MHz sine wave (pretending it is 802.11b chan 11), mixing it down to 40MHz putting it through my FPGA, mixing it back up and looking at it on a Spectrum Analyzer.
I have 4 taps (255 clock delays deep) to play with in my FPGA and am c... |
I was reading about Digital Cosine Transform (DCT Type-I) and it's use in JPEG.
I have the following doubt. My teacher offered an explanation which wasn't very convincing.
What property of Digital Cosine Transform makes it attractive for compression of images? Why Digital Sine Tranform is not used?
More specifically, ... |
I am trying to generate a random signal that represents a gyroscope drift. I know the Allan Variance characteristics of the signal (ARW, RRW, Bias Instability and Cluster Time for for Bias Instability).
I guess I could model this as an addition to two stochastic processes: a white noise process and a drift process. Th... |
I've been working on a project for some time, to detect and track vehicles in video captured from UAV's, currently I am using an SVM trained on bag-of-feature representations of local features extracted from vehicle and background images. I am then using a sliding window detection approach to try and localise vehicles ... |
I have checked this and this Question in this site very much similar to my question. But I want to know are they Qt compatible? I want to start learn developing DSP application in Qt framework so I want some library compatible with Qt so that it can later be translated into Qtpython also? Can we use same libraries with... |
I am having trouble understanding what is causing the problem to my Wavelet output when i am trying to display the image with the figure command.
I want to display both the Original image and its Wavelets decomposition,
but when I'm using this code the original image is not displaying in a separate figure.
Here is my c... |
I'm working on a project to hide simple string inside a 255x255 image using Wavelet transform. The problem is that,
When i used Haar Wavelet the result is successful,
This is what I've done,
Decompose the image into its approximation and details(Vertical,Horizontal,Diognal)
then Hiding message in the details of the I... |
I want to excite a loudspeaker with a constant magnitude chirp that sweeps across all frequencies in the audio band. I downloaded a test file from this Audio Check - High Definition Audio Test Files to start with.
I plot the log magnitude of the file with the following code which I use for other applications as well.
[... |
We are investigating ways to test a control algorithm. The algorithm has a non-equidistant track of input data (i.e. not every sample is valid, and we know it), and should output a series of correction factors.
Under a certain frequency, it should correct for a deteriorating light source.
Is there a way to black-box t... |
I need to graph a $16$ bits binary sequence, assuming that it'll be a FM analog signal I need to apply FSK to it.
So, I think I should use the formula
$A \cos(2\pi f_1 t)$ for binary $1$'s
$A \cos(2\pi f_2 t)$ for binary $0$'s
But I'm really confused about how to set a method for getting the graph for my $16$ bit sequ... |
I am interested in knowing the step amplitude on a signal which can only be measured through a hardware RC filter. The measured signal follows this formula:
$$
V(t) = V_0 \left(1 - e^{-\frac{t}{RC}}\right)
$$
Is it possible to estimate the step amplitude, $V_0$, given that we can perform two measurements on the almost ... |
I am working on a video motion feature implementation. I am implementing a work in a research paper. What I want to implement is this:
The frames contained in a video clip can be thought of as a volume obtained by considering all the frames in time. This volume can be decomposed into a set of two 2-D temporal slices... |
i have two audio signals .wav and i want to convolve them, the trouble is that the frequency do not fit, they aren´t just the same frecuency-lenght in the wavread arguments. i am supposed to use the lesser frequency to resample the other one using interp1 and splines. I really appreciate your help.
Thanks
|
I used MATLAB to produce a simple sine wave over time:
frequency=7
sampling_frequency=1000;
total_time=1-1/sampling_frequency;
step=1/1000;
theta=0;
time=0:step:total_time;
y=Amplitude*sin(2*pi*frequency*time+theta)
I then used the following code to fast fourier transform:
Y=fft(y);
ploty=Y/length(y);
stem(abs(ploty)... |
It is perhaps important to start with the fact that I am a complete beginner in DSP.
I have got a number of audio recordings (of sampling rate 22 kHz) - of bird songs - which I have been trying to analyse using FFT (in Matlab/Octave). Particularly, I am trying to show using Machine Learning classification algorithms th... |
I have an image convoluted by a rectangular PSF of a blur kernel. The fourier transform of the PSF has pattern of a sinc function: $\frac{\tau sin(\pi \tau f)}{\pi f}$. The image size is 256x256.
Would my following assumptions about the PSF on its period in frequency domain and width of its pulse in the PSF be correct:... |
I am not sure if this question will be a little off-topic on this forum, that I will give it a try anyway, since it implies signal process arguments.
By using MATLAB, I'm on my way to generate a turbulent wind field. This wind field is generally a Gaussian process with all the time series having 0 mean value and unitar... |
How exactly we should describe the process of Entropy Coding in wavelets ? can't it be simply called Coding ?
Here is the block Diagram of Image compression using wavelet,
I am confused about the "Entropy Coding" part. Can i simply use Huffman coding to code bits ?
|
Suppose a random signal $x(t)=\sum\limits_{n=-\infty}^\infty Z_n \delta(t-n\tau)$, where $ z_n = Z$ and $Z$ is a random variable with equal probability to be $+-1$, is passing through a low pass filter $h(t) = sinc(\frac t \tau)$ and the output is $y(t)$. and I want to prove the output signal is cyclostationary proces... |
I am looking for a method to calculate the instantaneous pitch variation within a speech signal for time-warping application. Sample by sample frequency variation knowledge within a frame will give more accurate output in time-warping.
Till now, I read about a method based on Teager's energy operator. Please suggest me... |
I need help to develop an object recognition system. It needs to identify an object in an image by comparing it with an image in an existing database. For example my database may consist of images of cars, buses, cups, etc. If i give a certain image as an input i want the code to check and tell me whether a car(as in t... |
I know this is probably a simple question, but I haven't been able to find a satisfactory answer anywhere...
Say you have a time series signal of finite length N. Call it $y[n]$. It looks like a sine-gaussian perhaps but with some random effects. The mean of zero, and no trend is present.
Now, say you receive this s... |
When we say we set a threshold to the edge finding, what values are we exactly thresholding on? I know a threshold value to limit only certain edges to show up, but what value of the edges is compared with the threshold?
In both the sobel and canny edge detection, they are comparing with a threshold value but I am neve... |
I know this question may not be very relevant to programming, but if I don't understand the theory behind image processing I'll never be able to implement something in practice.
If I got it right Gaussian filters are convolved with an image for noise reduction since they compute a weighed average of a pixel's neighborh... |
For audio classification we are using cepstral coefficients, but how should I decide the number of coefficients?
|
I'm trying to gain a better understanding of windowing functions, but so far I can't tell why they're used. As an example, I'm familiar with the Hamming Window:
$ w(k) = 0.54-0.46cos( \frac{2{\pi}k}{N-1})$ if $0<k<N$
But I don't understand how this can be done without distorting the signal. Are these specially chosen f... |
I am sampling a 5mhz blocks at an IF of 40 MHZ. I am sampling at 11MHz per bandpass sampling theory, but when I run the FFT I get all the aliases.
So I am trying to figure out how to constrain the fft interpretation to the appropriate bands.
IE i may be sampling the band from 80-85MHz by mixing it down to 37.5-42.5 M... |
I am a newbie in speech processing and experimenting to get a feel. I have extracted some speech segments using a window function and I want to find distance between a pair of segments. First, I took DFT of a segment and downsampled from the resulting frequencies (like 16 out of 256) and used them as features.
Then, I... |
Can someone explain sharpen in a non-technical way. So, I don't mean that you need to multiply every pixel with 5 and subtract it with the pixel left, under, above and right.
|
To find the complex Fourier coefficients of this sequence, then The $k^{th}$
coeff. $c[k]$ is given by the DTFS formula
$$
c[k]=%
%TCIMACRO{\dsum \limits_{n=0}^{N-1}}%
%BeginExpansion
{\displaystyle\sum\limits_{n=0}^{N-1}}
%EndExpansion
x[n]\exp(-in\frac{2\pi}{N}k)
$$
(Lets forget about the $1/N$ scaling for now). My q... |
I am trying to better understand discrete-time PLLs. I drew a picture of a simple feedback system here:
I want to be able to describe and understand the system at v(t) and y(t). I found a fairly good reference with the following diagram:
I am still having a hard time and I think if I could see a signal go through thi... |
I want some data to fit the corresponding Gaussian distribution.
The data is meant to be Gaussian already, but for some filtering reasons, they will not perfectly match the prescribed and expected Gaussian distribution. I therefore aim to reduce the existing scatter between data and desired distribution.
For example, m... |
I have a little problem with the subject Theory of signal. We were told to make amplitude and phase spectrum of cosinus in MATLAB, but we don't have results nor materials from our teachers, so we have to study from many different materials and you can imagine what this is like. So I'm a little confused.
However, I did ... |
I am working on lane detection system and I would like some suggestions from you as to how to detect lanes from a filtered image which I got after performing certain operations. Firstly, I should mention a few things:
The lane detection would be in a real road environment unlike here.
As of now, I am running it in rea... |
This question is moved from Stack Overflow.
Sorry about this noob question, because I never work with matlab and signal processing before. Here is what I want to do: I have a fixed length of byte array X, now I want to encode it to a sound file, I also want this process to be reversible, which means the sound can be co... |
I am using Naudio open source library and I am trying to do some simple filtering. The problem is that I hear some "clicks", not too loud. The library offers me the possibility to use at least two buffers, so the computing time doesn't introduce a delay between them. Because in the most of the time I am dealing with a... |
I have a output signal $Y(t)= \sum_{n=-\infty}^{\infty} Z_n \delta (t-n\tau) h(t)$ and $Z_n$ is a random variable with equal probability to be $+-1$ and h(t) is $sinc(\frac t {\tau})$
and the Expected value of $Y(t)$ is
$E(Y(t)) = E[\sum_{n=-\infty}^{\infty} Z_n \delta (t-n\tau) h(t)]$
$=\sum_{n=-\infty}^{\infty}h(n\ta... |
I want to estimate a channel based on LTE 3GPP EVA with given power delay profile (set of average power and delay of channel taps).
tau = [0, 30e-9, 150e-9, 310e-9, 370e-9, 710e-9, 1090e-9, 1730e-9, 2510e-9]; % relative delay (s)
pdb = [0, -1.5, -1.4, -3.6, -0.6, -9.1, -7.0, -12.0, -16.9]; % avg. ... |
The transfer function of a Low pass filter is H(w). From this I want to develop a high Pass filter. I read in DSP by Proakis, Sec 4.5, that the high pass filter can be obtained by translating H(w) by PI radians. I did not get how it will form a High Pass Filter? I think tt should form a Bandpass
|
Does anyone know how does the "Songify" app algorithm work?
There are 2 inputs:
speech (or amateur singing), and
underlying music.
Somehow the speech is altered and mixed into the music. Which DSP algorithms are needed to achieve this effect?
Pitch-shifter?
Time-stretcher?
Fundamental (F0) frequency detection?
A... |
Consider this system:
y[n]=y[n-1] + x[n]
It can be verified easily that this system has a finite impulse response (by putting x[n]= delta[n] i.e impulse, and evaluating impulse response h[n]=y[n]). Yet for a unit step input U[n], this system is an unstable system. On wikipedia it is mentioned that FIR filters are... |
Before today I had no idea there is any transform an such; I was only aware with DCT and wavelet transforms but today one of my teacher who is doing research on image processing project had told me that contourlet transform is way better than wavelet transform.
It is better because wavelet transform extract frequencies... |
I'm trying to use and understand SciPy's deconvolve for a project I'm working on. I'm having some trouble understanding how to use it.
What I would like to do is to take two PMFs from discrete gaussian distributions and recover an unknown distribution using deconvolution. My understanding is that if I deconvolve the PM... |
I'm reading up on DSP implementations and Q number format for representing decimal and decimal fractional numbers. Why would you use the Q format and not a standard like IEEE 754? When would you use one instead of the other? They both encode numbers into a sequence of bits, right?
|
Here you can see that the transfer function applied to a cosine input will give you a sinusoid and a transient term:
$$
x(t) = \underbrace{(x(0) + x'(0))(2 e^{-t} - e^{-2t}) + \frac{2}{5} e^{-t} - \frac{1}{2}e^{-t}}_{{\rm goes\ to\ } 0 {\rm\ as\ } t \rightarrow \infty }\ \ \ + \frac{1}{10} \cos(t) + \frac{3}{10} \sin... |
I'm starting to brush up on the Kalman Filtering I learned a couple decades ago. From what I remember, if you have a measurement vector
$$
z=H x + v
$$
and the $n$ components of the measurement noise $v$ are uncorrelated with each other, then you can process the measurements sequentially in the KF equations. Is there... |
I have been posting all over SE looking for a good method of finding the maximum of a trigonometric polynomial. A trigonometric polynomial is the sum of a set of sinusoids,
$$a_0 + \sum_{k = 1}^{N} a_k \cos(k \theta + \phi_k)$$
and can also be written in the form
$$ \sum_{k=-N}^{N} c_k \, e^{i k \theta} $$
where $c_k$ ... |
I have been trying to implement the CLAHE algorithm and came across this page which states step by step procedure for the algorithm.
I understand the initial steps to perform HE of tiles in the image. But can't figure out how to perform the interpolation in the last step to remove the artificial boundaries between the ... |
Am reading Rick Lyons - Understanding DSP book about Sampling. I have few doubts related to this chapter.
what is the difference between Bandpass Signal and a Passband Signal ?
Can somebody give an example for a Bandpass system which produces Bandpass signal as output !
When it comes to Baseband Sampling ( Low pass Sa... |
I've got a real 2D image of propagating waves in both directions. How can I separate this image into one with the upward-propagating waves and one with the downward-propagating ones?
This example has one wave in each direction. The x-scale shows time, the y-scale shows position, and intensity shows the amplitude of the... |
I need to approximate a function f, but I cannot do so with frequencies that exceed 1kHz
What is the best approximation I can get? Is taking the Fourier transform then zeroing any term above 1kHz the best approximation? Or can I fiddle with the lower order terms and get a better fit?
This is a made up scenario, but I h... |
I know this is very basic question and i am new to this site. But can anybody help me with my question. How to convert a sound file to other data format say using some type of transform (FFT or DFT) with which i can manipulate the data of the sound. Lets say i get frequency values from the sound i should be able to man... |
I would like to know the basic differneces between Gaussian filter and Bilateral filter in digital image processing...
I just know that both are used to smooth out an image but I would really appreciate if somebody let me know what is the purpose and scenario of each of these filters.
Thanking in advance!
|
Can I use the word amplitude instead of magnitude when I describe FFT bins? I dont see any similar word in my language.
|
I have designed a low pass filter that smooths the output coming from an accelerometer attached to a vibrating machine. I designed this assuming cut-off frequency $f_{c1}$, and sampling frequency $f_s$. Now the issue is when I change the machine , I have to change the cut-off frequency and $f_s$ manually, else the outp... |
My task is simple; I want to simulate analog low-pass filtering of an input signal, using Python. Note that the input signal is an array of values, not an analytical function.
My first question is if it simply is possible? If so, where is the line drawn between making a digital (FIR/IIR) filter and simulating an analog... |
i have 15 set of data which is the s-parameter, consist of 2 column (1001x2) each set. The first column is frequency and the second column is magnitude in dB. I have transform the magnitude from (dB) into value and frequency into time. But i have no idea how to transform these 15 sets of data into an image by using Mat... |
I am currently working on a gesture recognition system (for an Android Application). I think that I have completed the Image processing stage, where I am able to extract the contour of the hand (I am wearing a glove to avoid background subtraction for now).
I am also getting the bounding ellipse/rectangle, the centroid... |
Does the length of a Fourier Transform affect the ability to discern a small event in the data?
This is a tricky question to ask, let me clarify. I don't care about when the event happened and I don't care about the resolution of the event (it doesn't have to be some precise measurement) but I want to SEE the event. I... |
I have a signal $X(t)=\sum_{n=-\infty}^{\infty} Z_n \delta(t-n\tau)$, $Z_n$ is a random variable with equal possibility of $\pm 1$ and I know the power spectrum of this signal is $\frac {1}{\tau}$ from the solution.
I have try to calculate the power spectrum by the auto-correlation and then calulated by its Fourier tra... |
I am attempting to implement observer based state feedback in C and can't figure it out.
Here is pseudocode of the algorithm:
//Initialize Stuff
loop:
//read process variable
y = read(ch1)
//compute control variable ... |
I'm trying to understand the maths behind this Fast fixed-point $\tt atan2$ calculation with self-normalization. In particular, equation $(2)$ for theta1 appears to provide a first-degree expansion of some series. Similarly, equation $(2a)$ under "QUICK NOTE" seems to expand this series.
What is the series that's bei... |
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