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I am not very good in statistic neither in probability theory, and I do not completely understand the mathematical background of Monte Carlo simulation or SIR sampling, but I'd like computer vision and I'm experimenting with it hoping to get some nice results with already known techniques (I don't want to reinvent the ... |
I am trying to introduce a fractional delay in my input vector x[n] so the output is something like y[n]=x[n-M/N]. I am not supposed to use the MATLAB fracdelay function.So, I used sampling and delay. The three steps I followed are:
1)Upsample the input by M.
2)Delay the upsampled version.
3)Downsample the output obtai... |
As a follow-on to this post, how would you force linear phase for a FIR filter you synthesized using Berchin's FDLS?
|
When energy is referred to as the square summable sequence, is that energy a representation of the power of the signal? How is the energy of frequency determined?
E.g. what if an audio signal has high energy on the higher frequencies and another has high energy on the lower, bass, frequencies, how is this determined?
... |
I would like to know if
$$
\text {Z-Transform ( } G(s)H(s) \text{ )} = \text {Z-Transform (}G(s) \text{)} \text { Z-Transform (} H(s) \text{) } = G(z)H(z)
$$
where G(s), H(s) are the Laplace transform representations of g and h, and G(z) and H(z) are the Z-transform representation of g and h.
Is this relation true?
|
Why do we need an oversampling in OFDM signal? and how to do it?
If around half of the Sub-carriers are only used to send data, then do we need to perform oversampling to the signal? Is it necessary to have LPF in OFDM transceiver?
|
I have been looking to implement feature extraction and matching in MATLAB. For this, I've read many algorithms, but i'm not able to understand how to implement these in MATLAB. Is there any Book related to this topic which is based on MATLAB? i.e. gives exapmles and sample codes in MATLAB?
I have read Gonzolez and the... |
I have to detect speech intervals in large pre-recorded files in my project. I think, there won't be so much noise in the background (audio will be recordered in the room or even in the studio), but it still can be.
So, what are good VAD algorithms that I can use (algorithms, not libraries)?
|
In below image, we have scaling property of DFT, how the final equation is obtained from the above equation. That is how we are getting the scaling factor , $ \frac{1}{|ab|} $ in the final equation ? Please explain how we are getting $ \frac{1}{|ab|} $. Thank you
Equation 4.12 is given as
|
Does anyone know how to find information on the derivation (rather than the definition and application) of Teager's Energy Operator, both for the continuous and sampled case.
I have Kaiser's early papers "On a simple Algorithm to calculate the 'Energy' of a signal" and "Some useful properties of Teager's Energy operato... |
I'm designing a bandpass filter in scipy following the cookbook. However, if I decrecrease the filtering frequencies too much I end up with garbage at high order filters. What am I doing wrong?
from scipy.signal import butter, lfilter
def butter_bandpass(lowcut, highcut, fs, order=5):
nyq = 0.5 * fs
low = lowc... |
i've written a source code in visual dp ++ in c language. the platform is sharc processor adsp 21062.after the build is complete. while running the program it is displaying a message
Instruction timed out with PC at: 0x20a5a . what may be the error in my c code. can you please resolve?
|
I know that many books and papers talk about the DC offset/DC component of a filter. How do we define the DC offset mathematically, for the case of discrete filters?
|
I have a speech file that was recorded with a sampling frequency of 8kHz. I read the file in Matlab as [x,fs,nbits]=wavread('speech.wav). Now I play the file in Matlab using soundsc(x,fs). But if I use the command soundsc(x,fs/2) and soundsc(x,2*fs) the speech changes. What is the reason?
|
I am interested in analyzing full length songs for general features of the track which are not otherwise apparent. For e.g., I want to look at various parts of the song with time-frequency plots/wavelets/other signal processing tools for, lets say - How does the frequency content of the song during the guitar solo com... |
Can you please explain or point the right way to think about how to implement two sound effects in a .wav file.
So I read a .wav file and converted it to int values (in numpy array)
array([59383, 58290, 60629, ..., 52606, 51982, 56274], dtype=uint16)
First, I am not sure I am clear about what these values in array re... |
A state space representation is given by:
$$\dot{x}= \begin{bmatrix}0 & 0 & 0 & 0\\ 1 & 0 & 0 & 0 \\ 0&0&-2&-4\\0&0&1&0\end{bmatrix}x+\begin{bmatrix} 1\\0\\1\\0\end{bmatrix} u$$
$$y=\begin{bmatrix}0 & 1 & 0 & -1\end{bmatrix}x$$
I need to find a transfer function of this system. I don't know how, but I've tried it this ... |
In general any form of enropy is defined as uncertainty or randomness. In a noisy environment, with increase in noise, I believe that entropy increases since we are more uncertain about the information content of the desired signal. What is the relationship between entropy and SNR? With increase in signal to noise rati... |
For my source code witten in c ,in visual dsp++ 5.0 for a forward error correcting code on adsp 21062 sharc family platform. i want to plot a graph between different data sets. when i tried to use the plot window, it is showing the data sets which are in assembly.so how to plot a graph between the input and output in t... |
I'm working on a Ultrasonic Transducers resonance tracking system. Where phase shift between Voltage and Current is the feedback signal for my system when phase difference is Zero that means system is resonant other wise depending on the phase difference frequency will be changed proportionally. I went through lots of ... |
Is it possible to model the acoustic transfer function in MATLAB for a common set of headphones? i.e. I want to model the summation of a noise sample and the audio from the output of the headphone e.g.
signal = exteriorNoise + Music
Where signal would be the information the user would hear? I would imagine headphones w... |
When I do a spectrogram in matlab / octave I can create a swept signal that looks like the RED plot line below. But how can I create a swept signal like the BLUE line in the 1st plot using the equation below.
thanks to Daniel and David for getting me this far with the code is below
startfreq=200;
fs=44100;
endfreq=20;... |
I have a signal consisting of two sine waves of same frequency but have different phase (and also a lot of HF noise). Their amplitudes differ by about $120\textrm{ dB}$. How to I go about separating them? SNR is about $130\textrm{ db}$ but its frequency is far higher than my signal, i.e. $f(\textrm{noise}) \gg f(\text... |
I am inquiring as to a practical way to solve a problem I have.
Basically, I need to transmit a signal, $x[n]$, through a seismic transmitter. (It will go through a D/A, etc). The transmitter that we have has a certain frequency characteristic, in that, it passes certain frequencies out better than others. (Nothing sh... |
Problem
I wish to filter a discrete-time input signal, $x[n]$, so as the output signal's, $y[n]$, exponential moving average, $a[n+1] = a[n] + \alpha(y[n] - a[n])$, tracks around a constant reference $\mu_x$ such that $\mathbb{E}\{y[n]\} \approx \mu_x$, and also an approximately constant variance, $\text{var}\{y[n]\} \... |
What does the Eigen values and Eigen vector of a signal or function represent? What is its physical significance? I know about basis vectors of a signal which constitute the orthogonal planes where signal projections are represented. Are basis vectors and Eigen vectors same thing? Can we reconstruct signal using these ... |
I would like to experiment with some input from a microphone and am receiving a 2 channel, 512 samples buffer in real time
I know the signal could be passed through a low pass filter, and then windowed before the FFT.
The sample rate is 44100.00, what low pass filter is needed for this, does the analog to digital conve... |
I would like to write a BPM detector. Does either of the domains provide more information for this type of analysis?
What exactly is being looked for in the data to detect onset for BPM detection in either domain?
Does tracking energy values in the time domain lead into rhythm detection?
Obviously pattern recognition ... |
I have been trying to understand a publication here where Short time fourier transform is applied over n samples in steps of m samples each (m is the size of the moving window). I understand that the computational complexity of the Short time fourier transform for m samples is mlogm.
The operation also consists of extr... |
It might be a very silly question, however I'm facing problem with it. Now, the Gaussian noise is a signal with zero mean and variance. I understand what the mean and the variance mean however, I'm facing problem with zero mean. What does that mean? Does it mean that it is only a signal with variance which represents t... |
I am trying to get a working understanding of how to resize images using bilinear and bicubic transformations. I coded a resizing function based on things I've read here and Wikipedia, etc., but I get different results than what MATLAB and Mathematica give.
A minimal working example is the image im=[100 50 0] in MATLAB... |
Does FFT method input argument have to be power of 2, i.e, $2^n$
I just realized there are many algorithm for FFT implementation, is there any algorithm that takes arbitrary amount of samples as input argument?
if yes, what is their advantages amongst each other?
namely, what algorithm does Matlab apply?
|
I have an image processing application that is different than anything that I've done before, and am looking for suggestions on how to approach. Here is a basic description of the problem:
Given a set of images taken of over time, an "intensity wave" results for each pixel in the image, i.e. if you plot the intensity... |
First time studying image processing...
I just don't understand what does fourier transformed image of an image describe?
For example consider given following pictures, The first one is the image, and the second one is the fourier transformation of the image.
Now my question is:
By given the fourier transformation i... |
I have been given a sinusoidal signal x in time domain,asked to investigate the frequncy responce of the signal using matlab and observing the result,and using grpdelay(x,1) command in matlab to observe the group delay of the signal .and taking y=conv(x,x);which define the convolution of x signal by itself and then ask... |
I am trying to apply kalman filter for video processing , i am studying about it from different sources but it take me towards question that if i don't know that where my object come in frame mean i don't know about its angle (location in frame) then is it possible that Kalman filter automatically detect its measuremen... |
Using under-sampled data, what determinations can be made about the Nyquist rate (correct sampling rate)? If my instrumentation limits me to sampling data at a fixed but insufficient rate what, if anything, can be determined from that data about the sampling rate that would be required to properly represent the signal?... |
I have a sinusiodal signal x in time domain.I have done the convlotion as followings using matlab:
y=conv(x,x) and y=conv(x,fliplr(x)).
Observing the result by Matlab, both of the above signal giving the same result in frequency domain. Why do you think is that?
P.S: FLIPLR(X) returns X with row preserved and columns ... |
I have the following two graphs but I don't know how to recognize from the graph if they are IIR or FIR! Can you please guide me through?
P.S.: Does MATLAB have a function to detect if an impulse response graph corresponds to IIR or FIR?
|
I have used the following command to slice a large image into blocks of 2x2 pixels:
convert -crop 2x2 +repage Logo.jpg sl%d.jpg
When I attempt to put the blocks next to each other in the order that they should be, I get a smaller size of the original image. I wonder if there is anything I should do to get the original... |
I have a physical system consisting of a microphone, which feeds to a DSP, which drives a speaker. The microphone and speaker system have an amplitude response or gain, as well as a phase response, which is clearly lagging as the frequency increases.
The aim is to produce an IIR filter in the hardware of a DSP that ca... |
suppose we have an fir filter:
t=[-50:50];
x=[sinc(.1*t).*cos(2*pi*.15*t),sinc(.1*t),sinc(.1*t).*cos(2*pi*.3*t)];
using matlab command grpdelay(x,1),we observe the groupd dalay of the system.
then we have y=conv(x,x),again using the matlab command grpdelay(y,1) what changes in group delay would you expect to see in co... |
TL/DR: I'd like to take the median of lots of images to make a single "better" image. The problem is, the camera is slowly moving, and there is significant lens distortion. On the plus side the motion is constant, I've got lots of images, timestamps on each image, and I've been able to track points across the images ... |
I know that the complex wavelet transform is given by
$$\int_{-\infty}^{\infty}f(x)\psi^*_{s,u}(x)\,dx$$
where $f$ is the signal, $\psi_{s,u}(x)=\frac{1}{\sqrt{s}}\psi(\frac{x-u}{s})$ is the wavelet.
and $^*$ denotes the complex conjugate operation.
If I have the wavelet $\psi_{s,u}$, which is represented by psi in MAT... |
I am working with speckle noise reduction in ultrasound images. At present I am learning about anisotropic diffusion.I will explain first what I have understood about anisotropic diffusion.
I learnt the difference between isotropic and anisotropic diffusion using the diagram below:
In case of isotropic diffusion diff... |
I am trying to detect a crosswalk pattern on the road by using Hough transform, and then selecting lines that separate between black and white regions in a binary image. The stripes are detected fine, but the problem is that a lot of other unwanted objects provide false positives, as you can see in the image:
*You can... |
Let's say I have a sound file, I then compute the Spectrogram and segment each part of it. Assume that it is a recording of someone saying the word "Hello" and therefore, each piece is given like so:
0 -> H
1 -> E
2 -> L
3 -> L
4 -> O
Now I want to calculate the duration of each of the parts/phonemes. Is there a way... |
For a time discrete signal, the rect-filter (for 1D signal [1,1]) is a perfect low pass filter. I was wondering, what is the best gaussian approximation of this filter?
For a current problem, I cannot use binomial filters but have to use Gaussian filters for smoothing. Ths question is thus, what is the standard deviat... |
I want to make/create this spectrum visualization on a physical Led_Bar_Panel(s).
Here's what I think I should do:
Take sample's in real-time( Sampling freq = Fs KHz, only voice)
Do a FFT( As far I know we take (2 ^ n) samples at a time. Is there a mathematical relation between n and Fs ?)
Take the averaged amplitude... |
SIFT algorithm provides a 128 dimensional feature vector that is used for image classification.When all the interest points(key points) are taken together and K-means clustering is applied,the image is then clustered into many clusters.My question is how does this clustering/grouping of feature points together help in ... |
I repeatedly see two representations of the general transfer function in the literature. The first is the following which is factorization of the numerator and denominator polynomials:
$$\textbf{G}(s) = k \frac{ (s - a_{1})(s - a_{2})(s - a_{3})\ldots
}{ (s - b_{1})(s - b_{2})(s - b_{3})(s... |
I can not understand the reason why the following sentence is true:
If we have a Right-Hand signal(RHS) x(n), X(z), the Z-transform of x(n), has the same number of poles and zeros except at z = infinity
can any one explain why!?
|
If I have a discrete real-time signal $x[n]$, with its latest value $x[i]$ and all its past values $x[i-t]$, how can I estimate the derivative at $x[i]$?
|
I am currently working on a race car project where steering and braking is to be done by a fully electronic x-by-wire system. To roughly determine the minimum bandwidth of the controllers, I took user + car data from an existing race car. I though I would do an FFT of the input signals to see what the 'user' bandwidth ... |
Euclidian distance
Cosine similarity
Histogram Intersection
Or any other?
Consider the importance of the method in case of images. Eg, Cosine Similarity matches angle of two vectors...
What impact comparing just the angle or distance has on accuracy of BOW?
Detailed explanation is welcome!!!
|
I am trying to sample a sine wave and plot it's frequency components, but I am having problems implementing it.The result of taking 65536 samples of one cycle of a sine wave with max amplitude 1 and a frequency 100 can be seen below.Where the Y-axis this the magnitude of the complex Fourier sum, and the x-axis is the s... |
Given the frequency response $H (jω) = csc(ω)$ how would I go about finding the difference equation? I know I can find $h[n]$ from here but after that I feel like I'm missing something.
|
i am trying to understand how does the image rotation occur? i studied and came to know that we just multiply the image coordinates with rotation matrix which gives us the value of new coordinates. ok that is fine i get this. But main thing which is confusing me is the pixel values. i read that the pixel coordinates wh... |
In image processing, how do region growing and clustering differ from each other? There are many papers like clustering based on region growing. I couldn't able to draw a fine line between these two concepts.
|
I have a raw EEG signal of length 2,50,000 samples. I band passed it from 0.05-10Hz (sampling frequency=500). Then I down sampled it at 20Hz. Now question is: What will be effect if I vary down sampling from 20Hz to say 5Hz or 60Hz? And why 20Hz is appropriate?
|
I need to know what is iteration and divergence in anisotropic diffusion filter technique.
Isotropic diffusion $$\frac{\partial I(x, y, z)}{\partial t}={\rm div}\left[c\cdot \nabla I\left(x, y, z\right)\right], \quad
\text{where } c \text{ is the diffusion coefficient}$$
Anisotropic diffusion $$\frac{\partial I(x, y,... |
I'm trying to program a spectrum analyser in C++ but I'm faced with a conceptual problem : how to map the results of the FFT to an image ?
Let me detail :
I'm doing all this in a dynamic way.
I have chunks of audio data as float [-1;1] arriving to my class.
I put them in a circular buffer which has the same size as m... |
I know that all periodic continuous time signal have discrete spectral representations, but are all discrete spectral representations periodic in continuous time?
Also, can all periodic signals be represented by a fourier series?
|
I have a periodic term $V(x) = \sum_K \exp(iKx) V_K$ where $K =2\pi n/a$ where $a$ is the periodicity of the term and $n =0,1,2,3....$
Now I want to find the Fourier coefficient $V_K$ corresponding to a particular $K$. Suppose I have a vector for $V(x)$ having $10000$ points for $x = 0,0.01a,0.02a,...a,1.01a,....2a..... |
I'm trying to do time-series prediction with dynamic recurrent networks in Matlab (will try at least NARX and LRN architectures, if not one or two others). The question I have is, what is the functional difference between giving a network multiple inputs, versus giving it an input vector with multiple elements?
My inpu... |
How does the Non Local Means Filter different from other approaches such as:
Gaussian Smoothing.
Total Variation Denoising.
|
I came across a paper that is trying to classify and detect object(s) present in what they call a natural scene data-set. They have images containing objects like cars, bikes and people.
Can anyone tell me how this is different from other data-sets that contain the images of cars/bikes/people?
The site with the data-se... |
I'm finding some difficulties to understand the difference between Filters, and Windowing.
accoriding to my understanding both filters and window functions will make changes to the input signal parameters, according to wiki,
Filter:
a filter is a device or process that removes from a signal some unwanted component or f... |
I have three vectors, $x[n]$, $w[n]$, and $z[n]$. I need to compute:
$y[n] = z[n] * \Big(x[n] \cdot w[n] \Big)$.
This is easy to do. However, is there a way I can do this by 'opening' up the bracket?
For example, let us say that I am already given $z[n] * x[n]$. If this was the starting point, what could I do with th... |
I have one question concerning phase rotation of signals and I am not sure wether it works or not:
Let's assume we have a zero-phase wavelet x(t) i.e. Ricker wavelet.
Unfortunately, in our experiment, the wavelet y(t) we use is not zero phase anymore but rotated by an phase angle $\Psi$. Yet, we still can clearly iden... |
I have frequency response data. It is output from an acoustic simulator.
I convert this into an impulse response, and get:
In that picture the blue line is the impulse response. Mostly it is hiding behind the green line (which is the impulse response if I halve the frequency resolution).
I'm sorry for an unclear pictu... |
I heard from someone online who said: "Only random signal has PSD, determinate signal does not have. For example, period signal does not have PSD."
I am very astonishing about this statement, but it seems he is quite sure about his idea. In my opinion, both random signal and determinate signal have PSD, and it is the F... |
Assume the following:
img = 255*rand(512); %Generating a 2D matrix with random numbers between 0 to 255.
fftimg = abs(fft2(img)); %FFT of the image.
The frequency transform of this image is a single high value at the top left corner of the image. This means the 'energy' or the frequency response is the highest and co... |
I have a continuous signal,xc(t) which is bandlimited to =pi/T ,
and x[n] = xc(nT) are samples of this signal.
I need to show there is a Parseval's relation between the original signal and the sampled version.That is I need to prove that energy will be conserved!
Can anyone please help?
|
I'm trying to obtain the overall LTAS of a large batch of audio (wav) files. To do this, I should obtain the LTAS of each file individually, then take the average value across all LTASs for each frequency. I also need the standard deviation for each frequency. I'm doing this in Matlab, but am rather a noob. Can anyone ... |
We often hear that "convolution in time is the same as multiplication in frequency", and vice versa, that "convolution in frequency is the same as multiplication in time".
So in a typical windowing operation, we do a point-wise multiplication of a signal $x[n]$, with a window $w[n]$. This means that in the frequency d... |
I may have a potential application where maximizing the mode (as opposed to typically minimizing the variance) would be useful for state estimates. The situation may arise from skewed distributions where the mode is of more interest than the mean. I was wondering if anyone has seen a filter like this before? Thank you.... |
I have a raster image (A) of size 20x20 and I want to scale it down to a size of 10x10 (B).
Naturally in the resulting picture B one pixel will represent 4 pixels shaped 2x2 from A.
Is it possible to give a canonical answer to how the pixel values of B have to be calculated if no neighbouring pixels (surrounding the 2x... |
I am trying to find the fundamental frequency of a bearing fault.This is my code
c2=cceps(abs(Signal_fft_hilbert(2:250)));
plot(freq_s(2:250),c2)
And this is the cepstrum plot in the image. I have plotted the frequency instead of time. Is that right? And I am not able to identify which should be the fundamental freq... |
I need to implement a script for generating features from an input image by using the Gabor filter. I have no past experience of wavelets and I'm just learning Fourier analysis (I understand the basic idea behind Fourier analysis and transform) so they can't help me to understand Gabor filter, because I need to have an... |
I would like to get the bpm of a song analyzing the spectrum of the volume.
Doing a fft what I get is a peak at the origin and of course that can't be the frequency corresponding to the bpm, so I do the following:
$\overline{h} = h - \frac{1}{l}\sum_0^l h$
where $h$ is the fft of the volume and $l$ is the length of the... |
I have a dataset of images representing human skin. How do I plot the skin color distribution in HSV color space and YCBCR color space. However, I'd like ignore the "value" or "brightness" in both color spaces and analyze rest of the layers.
edit
The below is the code, I found to plot the distribution for ycbcr but don... |
Suppose we have a communication channel that has a bit-error rate of 50% and the bits are flipped at random such that the receiver has no efficient way to tell which bits have been flipped and there are no error correction bits transmitted with the signal. How do you calculate the information loss (in bits) imposed by ... |
I'm currently trying to decide what classifier to use for my snore detection algorithm. Which uses some features like Zero cross rating, frequency band energy, first formants...
The classifiers which have been pointed to are:
Support Vector Machine
Naive Bayes Classifier
Knn Nearest Neighbour
Linear or Quadratic Classi... |
In the following question and answer I kind of get it how it is calculated at surface but I don't get it fully. Can someone please explain the answer in depth?
|
Say for instance, face detection algorithms - I see researchers testing their algorithms and table their results under TP and FP. What are these?
|
I have a sound source that generates an ultrasonic pulse. I have two microphones seperated by a distance which are at a distance from the source. I want to find the time delay of arrival of the ultrasonic pulse at the mics. I am filtering out all the frequencies other than my source frequency from the outputs of the mi... |
I have a doubt. We calculate metrics such as PSNR, SNR, and MSE to prove that the proposed algorithm is better than its counterparts. To do this we need Original image (Noise free), Noisy image (we add this noise) and then Filtered image. Now we compare original and filtered output to estimate these parameters.
My ques... |
Lets say I have a matrix x=[ 1 2 1 2 1 2 1 2 3 4 5 ].
To look at its histogram, I can do h=hist(x).
Now, h with retrieve a matrix consisting only the number of occurrences and does not store the original value to which it occurred.
What I want is something like a function which takes a value from x and returns number ... |
I am having trouble wrapping my head around digital filters with different orders of numerator and denominator. Let me know if any of these points is wrong:
All (digital or analog) transfer functions have the same number of poles and zeros, if you include the ones at infinity. So $H(s) = 1/s$ has a pole at the origi... |
So, I am reading a paper about ORB: An Efficient Alternative to SIFT or SURF and it happens to calculate the direction of corner from it center . According to Rosin the author of the paper;moments of a patch is given by
and the centroid is of the patch from the center is calculated using:
The direction of the patch... |
How to calculate the Q value for a high pass filter ?
Ps: I'm a beginner in signal processing, so please put it in simple terms.
|
I know that the frequency response of a filter is described by equation:
H(w) = 1-1.176*e^(-jw) + e^(-j2w) , where w is the angular frequency.
Then in time domain I have a filter that is described by difference equation:
y(k) = x(k)-1.176*x(k-1)+x(k-2)
Now I'm asked to explain the connection between these equations an... |
Hi I am working on one project and I have some trouble with comparison audio files. I have read a lot of articles about this problem but I couldn't find a good one working.
In my project I need to compare two audio events like gun shot, explosion, crying, breaking of glass, ... These files have max 5sec duration but it... |
I am working on an audio system where I need to implement an equal power crossfade between two signals over a specified number of samples. Initially I implemented a linear fade but this creates a dip in the middle of the crossfade which I don't want. I tried a few other methods that I found on Google but they either ma... |
In the below link: Active Contour
http://en.wikipedia.org/wiki/Active_contour_model
Internal Energy of the snake is
$$E_{internal}=\frac{(\alpha\,\!(s)\left | \mathbf{v}_s(s) \right \vert^2 + \beta\,\!(s)\left | \mathbf{v}_{ss}(s) \right \vert ^2)}{2}$$
Why it is divided by 2 ?
|
I am stuck in a situation here while calculating received SNR in AWGN channel.
When I performed calculations directly in decibels, I got very high SNR value for instance 140 dB.
I am using the formula:
SNRreceived = [power transmitted(dBm) + FSPL(dB)]-[No(db) * B(hz) + 10log(KT) + NF(dB)]
Could anyone point out where... |
For a question on my homework, I am given f(t) = e^(-a*abs(t)) and asked to find the Fourier transform of the function. I understand how to do that part, but then the answer requires me to "Compute the amplitude and phase spectra" of the function. My question is, what are these spectra and how do I obtain them from the... |
I'm quite new to the subject and am having fun playing around with the FFT. What I am currently doing is trying to sample an audio signal and display its frequency spectrum at the same time. This works alright with what I am doing so far, but there are still a few missing puzzle pieces.
This is what I have implemented ... |
I am working on bearing faults detection. I am doing the following steps:
signal->mean zero->high pass->hilbert->y->fft->cepstrum of y.
my code is:
analy = hilbert(Signal);
y = abs(analy);
N = 2*2048;T=N/Fs;
sig_f = abs(fft(y(1:N)',N));
sig_n = sig_f/(norm(sig_f));
Signal_fft_hilbert = sig_n;... |
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