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Currently I am working on chord recognition, and get confused on several aspect. One of them is choosing windowing for reduce the spectral leakage.
from what I read, hanning/hamming function is a good choice for windowing, but currently I read about welch windowing function, and its quite good either.
So, can somebod... |
Hi guys I'm currently studying for finals and I came across a square pulse problem.
I ended up getting this:
I'm wondering if I can simplify this to a sin function. If so how? And please correct me if I did the problem wrong in the first place.
|
I am using MIT-BIH arrhythmical database where I have a digital signal of 1200 Hz so 1200 samples per second.
This means that analog filters have already applied to remove the frequencies over Nyquist frequency, so no aliasing.
However, I want to take equispaced sampling, every two sample, simply by the following in Ma... |
I am new to seismic data processing and I really have no understanding of the term 'phase'. So, could anybody give me a simple explaination of the term?
Thank you
|
I am doing some post-hoc analysis of a dataset consisting of a series of movie frames that are contaminated by a strongly periodic artifact. I would like to remove this artifact from my frames.
For ease of plotting I've just reshaped my array M of pixel values to [nframes, npixels], then averaged over all pixel values ... |
I am having some troubles understanding the algorithm.
My algorithm looks like this.
how come am i able to compute the DFT coefficient using this algoritm.
As far as i know
$$
X[k] = \sum_{i=0}^{N-1}x(n)W_N^k
$$
which using Goertzel is the same as $$X(k) = y_k(N) $$ and since $$y_k(n) = v_k(n) -W_n^kv_k(n-1)$$ a... |
I am studying digital signal processing and our professor gave us a task of modulation and demodulation and designing an appropriate FIR low-pass filter in Matlab.
I have done the modulation and demodulation but I am stuck on the filter designing. I want to know how the coefficients of filer are determined.
|
When you perform a discrete Fourier transform (DFT), and compute the DFT coefficients, $c_k$ and $X(K)$, what do these values tell us about the signal it came from?
|
In radix-2 FFT, why is the bit growth equal to $1+\sqrt{2}$ per stage?
I want to know the logic as to how that value has been obtained. Is it just empirical or has it been derived?
|
How is iterative refinement is applied to the estimate obtained by Lucas-Kanade algorithm? I am familiar with the following steps:
Estimate velocity at each pixel using one iteration of Lucas and Kanade estimation
Warp one image toward the other using the estimated flow field
Refine estimate by repeating the process
... |
Actually I want to calculate the cross correlation coefficient of any signal on comparing with all mother wavelets like Morlet, Daubechies using MATLAB.
|
I want to calculate delay between an input and an output audio signal of my audio processing system. The input and output signals are available as signed 16 bit integers. To try out, I tried the autocorrelation of the input signal with the following numpy commands:
import numpy as np
import wave
wfp = wave.open('test.w... |
First off, I apologize for possibly incorrect use of jargon, as I am new in this area.
I have a type of signal that I am assuming can be described by an arbitrary number (let's say $n$) of basis vectors, which are linearly independent. I am measuring a signal through one sensor, which gives me a vector of amplitudes. ... |
One way to measure the frequency response of a filter is to input separate cosine/sine wave at the desired frequency, measure the steady state output, stack the inputs/outputs into complex arrays, and divide. A more efficient way is to use the DFT, and somehow we get away with just inputting one sinusoid.
Input $x_n =... |
Thanks porten!
Thanks Bitstream!
But our professor has said that design your own filter!(not used built in function of matlab).
I am designing my own filter.The problem is still there.First, i have to know filter's order(N). One way is to find from its transition width. The pass-band edge frequency is 500Hz and stop b... |
I currently have a .wav signal that was recorded at a 48 kHz sample rate, with a central frequency of 5.260 MHz and bandwidth of 4 kHz. I'm trying to get some information from this signal, specifically the location of the frequency peaks using matlab, which I would expect to be around 5.260 MHz. The code I'm using to g... |
This might sound silly, but I have a language barrier type of question, and I was hoping someone could clear up this misunderstanding:
I've seen the term "early vision" several times in papers I've read, but the term often doesn't accompany any later publications to compare with when using the term. At first I assumed ... |
I understand FIR & IIR digital filters are often implemented in fixed point DSP hardware. I have also seen them implemented in software. Do companies make special purpose digital filtering chips that use floating point precision (float) and (double)? When fixed point hardware is used, what are the choices for the bits ... |
When using Butterworth filter in MATLAB, if I chose an order too high, sometimes the filtered signal would grow without bound to infinity, and if I decrease the order, the problem disappears, has anyone encountered the same problem, and why?
|
I have a mic having sensitivity chart as below which has relative dB on y-axis showing
1V/0.1Pa
what does this convey how to read my mic's sensitivity
a document on microphone sensitivity from analog says the microphone sensitivity is measure with 1Pa pressure as reference
confused in half way after seeing my datas... |
The ripples in the amplitude spectrum of a linear spectrum is undesirable. I desire to obtain a flat spectrum response. Hence, how can I remove these ripples? Also, which factors (like time bandwidth product, chirp rate) are affecting the ripples, and how?
I designed a chirp with a frequency from 10 to 90 Hz in MATLAB.... |
To be correct I want to determine variance of white noise before integration (brown noise is white noise after integration). For example, I have a following model (in MATLAB) of noises acting on my sensor:
How can I determine variance (power) of 'white noise 2' from samples (total noise)?
Of course noises are band-li... |
What does the squared magnitude of the DFT coeffiecient tell me,
where do I use it?
what does it define?
$|X(k)^2| = ???$
I am curious to know because the Amplitude is given by the formula $A_k = \sqrt{|X(k)|}$
So it cannot be the amplitude.
It would help me alot if anyone could help me.
|
I have solved the problem of finding the filter's order. The order, $N$ is 144 (N= 4/Normalized of BW).
Since the $F_s$(sampling frequency) is 7200Hz, $f_p$(pass-band edge frequency) is 500Hz and $f_s$(stop-band edge frequency) is 700Hz.
Now, I want to:
Create an ideal impulse response i.e, sinc function and then
App... |
I am very new to Fourier analysis, but I understand that through the use of the Fourier transform a signal in the time domain is displayed in the frequency domain, where frequency values are normally displayed along the x-axis, and amplitude is displayed along the y-axis. However, at one point in the textbook I am usi... |
I have ordered a USRP kit to do radio signal processing in software. Is there a way to use the same device to process sonar data? What would I do upconvert the sonar to 50 MHz?
|
my guide has told me to get familiarized with state estimates and kalman filter ....the problem is that:
1) I am totally new to this topic and finding it really difficult to understand due to lack of materials. so, can someone give some suggestions on how to proceed.
2) I am also suppose to incorporate delayed data int... |
I'm creating a program for localizing types of barcodes.
(I know plenty exist, that's not the question :) )
I'm focusing for the time being on 1D barcodes.
The difficulty I have is that the barcodes I need to be able to locate could be situated anywhere within an image with other information (text/images/...), inequal... |
I'm trying to implement some code for watermarking on audio based on a scientific paper. I'm stuck in the part of the pseudo code where they calculate the fourth order cumulant of the approximation coefficients of DWT. I have no idea what a cumulant is even when I tried to understand the theory.
I found the following ... |
I have a corpus of several thousand sounds. Now I pick a sound sample S, and I want to find in my corpus the sound S' that is the most similar to S.
The application is for music, for a composition that I am working on :) I found a lot of questions which are all related to speech recognition. The problem here is differe... |
Can anybody tell me the advantages of the lifting scheme and why it is better then a normal filter bank?
|
I have a sin wave of 16Hz, sampled at 2048 samples persecond. I performed the FFT of the sequence and did a spectrum plot. My plot gave me two spikes at both ends of the graph. But i was told the spike is meant to be at 16. how exactly am i supposed to do the plotting in order to get this exact spike?
|
Dear all,
Please find attached image,
I am not able to understand why is the underlined term is to be included.
Shouldn't it be simply the exponential term?
|
Following this link:
http://software.intel.com/sites/products/documentation/doclib/ipp_sa/80/ipp_manual/GUID-5457048E-3C59-43E4-8A99-FB3873DCB769.htm
I have produced the following code:
const int len = 512;
Ipp64f pInputSignal[len];
int tapslen = 27;
int numIters = len;
IppsFIR... |
Some animals are specially trained to repeat human phrases, others just make sounds that people interpret as speech.
In this video a rooster seems to say "Cristo Viene" (Christ is coming).
Taking the spectrogram of that rooster to analyze the formant position of the vowels I can't find any matches (I was using a forman... |
I am an experimental research engineer working on a Laser experiment. The details do not matter but due to practical limitations my data is influenced by the following transformation during data acquisition, and I was wondering if there is a mathematical method or an algorithm to "undo" its effect on the captured signa... |
If I have a measured signal $y$, true signal $x$, and a convolution matrix $A$ that is a Toeplitz but not circulant matrix, I can write the convolution as
\begin{equation}
y = A x \ .
\end{equation}
However, I would like to analyze the system using diagonalized coefficients of the Fourier transform. A re-formulation su... |
When I searched for octave, I listened to the fact that if you take an octave band the lower cutoff is double the upper cutoff.
Where is this name octave coming from, that is, where does the figure eight show its significance in the above statement?
In the same way, if the above is clarified, I have some doubts on 1:2 ... |
My doubt is in regards to the usage of the function cceps in Matlab.
The function is giving me the cepstrum for the entire speech signal of 3 or 4sec. This works well when I play back the signal after taking the inverse (using theicceps function). However, in order to analyze the given speech signal, we are supposed t... |
I am having some problems understanding how the Fourier transform method is used to determine the FIR filter.
As far as i have understood, you start by using the ideal impulse reponse for the specific filter design you want to have. Those are given in this table
As the the ideal impulse reponse contains infinite impu... |
If we filter out ideal white noise using an ideal LPF of cutoff frequency 10 KHz and then sample it at 30 KHz , is the resulting discrete signal statistically independent? I would like to know the statistical behaviour of the output signal.
I was attending an on-line test. My answer was told wrong.Below is the snapshot... |
I am detecting vehicles from the video (taken with a camera), and the vehicle detection part works fine.
My problem is that I should always extract only one representative frame per vehicle, and not the whole sequence.
As an example, if I have a few seconds of video (and possibly multiple vehicles), my approach current... |
I have a wav file recorded from a hydrophone. I am not quite familiar with signal processing so I really need some advice from you.
I have gathered the information which looks useful and related.
sample rate = 250 000 Hz
Receive sensitivity of hydrophone = -180 db re 1V/μ Pa
Peak-to-peak voltage range = 5.64 V
Pre-ampl... |
I have a simple problem I would like to figure out for fourier analysis of seismic data.
Let us say that we have a signal $z[n]$, of length $N$. If I take its (same size) FFT, I will get $Z[k]$, also of length $N$.
I know that zero-padding will not improve my resolution, however, what I am trying to figure out is: If... |
I've been doing some work with creating visual output on oscilloscopes using audio; here are some examples:
http://www.youtube.com/watch?v=UJ8-vySqEAI
This is using Max/MSP to read from a buffer of 3d geometry as audio output to an oscilloscope screen. I'm interested in doing transformations on full frames of video as ... |
I would like to create a very simple system that allows a user to train (once or multiple times) a spoken phrase (from 1 word to a whole sentence.)
Then the (same) user would speak the phrase back, and the system would score how close to the original the phrase was matched. If certain words were missed or incorrect, th... |
I would like to know how to compute the statistics of the discrete Fourier transform of a noise signal. To illustrate what I mean, I will first explain in detail a computation I have managed to do myself.
Suppose we have a discrete time series of values $x_n$ with $n$ from 0 to $N-1$. Each $x_n$ is a random variable, u... |
Here Above are the frequency responses of different size microphone(condenser)
what actually is the relation between the microphone capsule size and frequency response ?
The conclusion is that a large diaphragm microphone will have a more limited frequency range than a small diaphragm. This is illustrated in the gra... |
BM3D is considered state of the art in Image Denoising. I am trying to implement the algorithm in Matlab. Right now, I am done with the 3D wavelet transform in the first step, and to be precise, the equation 3 in the aforementioned paper. What I want to do now is to carry out the equation 5 on my de-noised patches in ... |
I've been looking around and found some great C/C++/Java libraries like CMU Sphinx or Windows SAPI. I did not like SAPI, and CMU Sphinx is way too complicated... would need months to understand how it works.
So I would like to start writing my own library, even it would be crap, but to understand all the parts how to r... |
i want to know more about brief descriptor algorithm and matlab code for this.
the points copmare with another what choice them. e.g. 128 point at patch how are choose.?
thanks
|
When a sum of sine waves is passed through a non linear process, harmonics and intermodulation distortion products are created, which are visible when applying an FFT to the signal. This causes potential problems when figuring out which sine waves were present in the signal originally.
Does something similar happen wh... |
How can I detect a quadrilateral in a point cloud that looks almost like a rectangle? How do I set the criteria (i.e orientation, size etc) to get the shape for example in the image below?
|
I am working on a spectrum analyzing simulator, which is meant to compute and plot the FFT of a sine wave carrier signal of $16 Hz$.
From my practicals with a spectrum analyzer, I know that the spike shows up on the $16Hz$ mark. But after computing my own FFT and passing the magnitude of the FFT to a plotter in Matlab,... |
My problem is essentially a 'blind source separation' problem. I have 3 non-orthogonal sources (or basis functions) and $N$ random linear combinations (mixes) of said sources. My problem is to obtain the sources from the mixes.
Figure A shows the sources, B shows the mixes.
Approaches taken:
$\textbf{PCA}$ - I tried ... |
In idea of buying an SPL meter i have drawn the specifications out in them very first and important spec is sensitivity of microphone many high priced microphones have their sensitivity arround 50mV/Pa where as some other with less cost have it arround 1V/Pa,
so what actually i want to know is, what is the actual role ... |
I would like to resample an audio signal.
Sampling frequency of an original audio signal is 50k Hz.
What I want to down sampling frequency is 30k Hz.
In this case, I followed the procedures as below using LabVIEW.
'1. IIR low pass filter
Butterworth / 6th / Lowpass / up to 15k Hz
'2. Resample to 30kHz
Why I used LPF ... |
suppose I have a 4 seconds signal captured at $f_s$ = 1024Hz, which gives 4,096 data array. What is the different between these 2 FFT methods (MATLAB code)
[1] FFT the entire input with 4096-points FFT
N = length(input);
Y = fft(input)/N;
[2] Divide the input into 8 segments (4096/8=512 data point each), and feed each... |
I want to set the precision to 24 bits while using matlab. Is this possible without using vpa?
because vpa is consuming lot of time since I am calling vpa more than 8000 times.
Please help
|
I am reading a text on discrete signal processing, which states that the frequency response of a signal can be obtained by plugging the value $e^{jω}$ into the z-domain transfer function $H(z)$. In other words:
$H_{IIR}(ω) = H(z)|_{z=e^{jω}}$
In the example given in the text, it is given that:
$H(z) = (\frac{1}{1 - \fr... |
How can I find this all pass filter's phase?
$$H(e^{jw}) =\frac{−a* + e^{-jw}}{1 - a(e^{-jw})}$$
where $a = ρe^{jϴ}$ is the pole.
Then I want to find group delay, I know that the group delay is the derivative of the phase with respect to w but i don't know how to find the phase
|
I often see examples in textbooks where someone constructs a 2D Fourier spectrum of an image by fixing two (symmetric) pixels to a given value, and computes the inverse DFT to get a nice waveform image. I want to know how these images are created. It seems to me that they pick one pixel that would give them the desired... |
there.
Let me have a noisy speech signal $y(k)$ as below.
$$ y(k) = x(k) + v(k) $$
where, $k$ is the discrete-time index, $x(k)$ is clean speech signal, $v(k)$ is a zero-mean random process, uncorrelated with $x(k)$ e.g. white noise.
If we put into this as a vector form:
$$ \textbf{y} (k) = \textbf{x}(k)+\textbf{v}(k)... |
It has been said a picture is worth a thousand words!
There have been a large number of softwares to write dsp codes and analyze signals and algorithms. It will be good to share on data plotting tools, that is - given a data set (1-d, 2-d, 3-d, ..higher dimensions (creative ways to visualize this)) what are the differe... |
I'm a bit confused with some details about frequency domain or studying systems with Laplace and Fourier analysis.
Let's say we have a system with a transfer function $H(s)$ with no poles and zero's at origin. We know that the transfer function is a ratio between output and input. Also, an input of $X(s)=1$ represents ... |
Matlab documentation says things like:
For high order filters, the state-space form is the most numerically accurate, followed by the zero-pole-gain form. The transfer function coefficient form is the least accurate; numerical problems can arise for filter orders as low as 15.
http://www.mathworks.com/help/signal/ref... |
I have this linear system that is defined by the differential equation
$$
y''(t) + 4y'(t) + 5y(t) = 2x(t) + 3x'(t)
$$
with x(t) the input and y(t) the output. I'm asked to find two things: The output when x(t) = cos(t), and the impulse response
This is what I did: First, I found the frequency response,H(f)... |
I have no background in telecommunication. Could anyone please explain to me what is the IQ data in telecommunication? It will be best to explain it with some basic analogies. Many thanks!!
|
If we have an Image I and a Gabor filter created at specific size and orientation, assume that is 11x11.
I saw some persons who normalize the size of the filter, but i didn't understand what was meant by "precalculate the normalization of the filter size". And within the normalization, they square the image, for exampl... |
I am trying to understand the equivalence of convolution through polynomial (coefficient) multiplication, Fast Fourier Transforms, and matrix multiplication. I am using octave with the octave-signal package, and part of this question may possibly related to their implementation (which I believe would be the same for MA... |
I red this link, but unfortunately i still don't understand the process...
By the way, Dilation process is performed by laying the structuring element H on the image I and sliding it across the image in a manner similar to convolution.
The grayscale morphological dilation formula is written as follows :
$[I ⊕ H](u,v) =... |
Doing excersies from Richard Hammings book about digital filters I've got two questions about them:
1) Fourier expansion of $g(x) = \sin^5(x)$. Provided answer is: $\sin^5(x)=5\sin(x)-20 \sin(3 x)+16\sin(5 x)$. Which is obviously contradicts well-known solution. Is it mistake in a book or author meant something another... |
In image processing, why do we always use odd square kernels(3x3, 5x5, 7x7, etc.) for filters?
Why can't we use kernels of size 3x1, 5x3, etc. that are rectangular kernels? Also, why do we not prefer even kernels (2x2, 4x4, 6x6, etc.)?
|
Mercury's distance from the solar system's barycenter (in kilometers)
can be approximated as:
5.9115960588705115e7 + 1.1573608483842954e7*Cos(2.086944367456105 - 0.0029751428085695573*t)
based on 8 years worth of hourly "samples" from HORIZONS. (t is in
hours; I forget what value corresponds to t=0, but it should ... |
I have some samples that are read from a square pulse wave and I'm looking for a way to find the characteristics of this wave.
It's a pulse wave, let $T_1$ be the non-pulse duration and $T_2$ to be the pulse duration, usually $T_1$ is bigger than $T_2$.
I would like to know the base frequency, e.g., the frequency that ... |
I'm looking at last year's exams, and I found an exercise I can't solve:
(Roughly translated)
Consider $x(t)=\sum\limits_{k=1}^{+\infty}\left(\frac{1}{2}\right)^k \cos(k2\pi t)$ the input to a LTI system, with the transfer function shown in the picture below
a) Determine (and sketch) the Fourier transform of x(t) and ... |
I am doing a time series change detection experiment. One of the experiments includes generating some artificial data for model evaluation.
I came across a problem in generating noise data with some arbitrary covariance at every 100 time steps.
While randn from Matlab allows me to generate the value, I am never able ... |
On Wikipedia there is quite a list of window functions. However, when you are doing a lot of STFTs, you often have to have some overlap to get better results.
Generally an overlap factor of 2 (i.e., 50% overlap) works fine (I'm doing analysis & resynthesis), but for some windows it isn't good (I currently have this ex... |
I'm doing EEG data collection and my amp forces use of an analog lowpass filter before the ADC. I'm fairly sure that I won't be interested in phenomena associated with frequencies of 30Hz or higher, so it strikes me that the most disk-space efficient thing to do is to analog lowpass at 30Hz (it uses a Bessel filter) an... |
The original Microsoft Kinect device IR projected a spacially encoded dot field and looked for distortion in the dot field with a single IR camera to create a depth map. But there were thousands of dots.
I've seen a few devices however, usually in motion capture, that only use a few dots. The one pictued below for exam... |
When you are transforming a signal in to a frequency domain using both DFT and DCT, say for a function sin(x), how the spectrum will be? will both frequency values (of DCT and DFT) same? Can anyone explain the values of the frequencies for the function sin(x) (obviously the frequency should be 1/2π)
|
I have difficulty in understanding what is Hue and Saturation. please explain what is hue and saturation to me with an example or analogy.
|
Thanks for reading my question. Please refer good books(links, if possible) for the following topics in Image processing. Your help is very much appreciated.
UNIT II SEGMENTATION
Fuzzy clustering, Watershed algorithm, Active contour methods, Texture feature based segmentation, Model based segmentation, Atlas based segm... |
I have the following problem, that I ran into recently, when calculating the spectra of data that I obtain from a measurement technique, we are using in our group.
In short what we do in the technique, is record a movie of a fluctuating, nearly circular object and determine the contour in each frame of the movie. We th... |
If I have a measured signal $\mathbf{y}$ which is the result of the true signal $\mathbf{x}$ convolved with another function (linear and not circular convolution), I always seem to get an underdetermined system. Convolution expressed as a matrix equation:
\begin{equation}
\mathbf{y} = \mathbf{A} \mathbf{x}
\end{equatio... |
can someone please help me? I have a project to implement a superheterodyne transmitter and receiver without using matlab functions that modulate. The first part which I can't seem to get right is the RF filter, which the my doctor said should just be a bandpass filter centered around Wc. I am supposed to get two sound... |
I'm not sure if this is possible, but let's say you had access to the original raw sampled digital pixels from a sensor, captured with nothing between the sensor and the lenses, i.e. Anti aliasing filter, colour filter array etc etc removed. Would it be possible to filter the raw pixels in relation to the original wav... |
What should the energy, pitch frequency, and zero crossing rate of a voice/unvoiced/silence frame in signal be?
My professor said that it is experimental, but I do not have any idea what the factors of these are and where I should begin from.
I would appreciate any guesses based on experimental data or any limits on th... |
I would just want to prove $\cos(t) + \cos(\pi t)$ is non periodic.
I don't know where to start it. Also I know that individually these signals ie $\cos(t)$ and $\cos(\pi t)$ are periodic with frequencies $1/(2 \pi)$ Hz and $1/2$ Hz respectively. But since the superpositon of these signals is not periodic should we re... |
A lot of people use imfilter to achieve a 2-D convolution between an image and a filter, but the majority of people use conv2 instead of imfilter because it is faster than imfilter by at least 20%.
Examples:
filtered_image_with_imfilter = imfilter(image,filter,'symmetric','same','corr');
filtered_image_with_conv2 = con... |
I am trying to gain a better understanding of pole locations in the $z$-plane of a given discrete transfer function, $H(z)$. I think I have a pretty good understanding of how to use the $\mathcal Z$-transforms for filter design, but there is something about the core concepts that still confuse me.
I understand that po... |
Suppose that $G(i,j)$ is a Gaussian decay function on the distance between points $i$ and $j$ of an image. In addition, $D(i,j)$ is the difference between the VALUES of the image at those points.
Now, at every point $i$ of an image I need to compute the summation of the neighboring $G(i,j) D(i,j) $ , this is, the prod... |
I am very very new to signals, and I am trying to generate sounds based on some parameters from a database. So, the database stores the following:
startFrequency
endFrequency
startAmplitude
endAmplitude
duration
I am generating a WAV file based on this information using the following code:
...
double currentFrequency... |
I am trying to estimate the Spectral Correlation Function by the FFT Accumulation Method (FAM) in Matlab. The way I understand the FAM method is as this link (see page 6 & 7 for FAM tutorial).
Here is the image again summarizing the process:
I'll summarize how I am understanding this method below:
Acquire a data chu... |
I have this differential equation
$$
y''(t) + y'(t) + y(t) = x(t) - 3x'(t)
$$
I found the system response of the system:
$$
H(f) = \frac{1 - 6\pi fj}{(2\pi fj)^2 +2\pi fj+1}
$$
which is equivalent to
$$
H(s) = \frac{1 - 3s}{s^2 +s+1}
$$
My question is: How to find the impulse response? ... |
When you use the deconvolution method to make the blurry image sharper, you will have to estimate the Point Spread Function. Is there a difference between this PSF and an image kernel?
Second question: Is the Point Spread Function in the time domain or frequency domain? Or can it be in both?
|
experts.
I have a question concern "linear sine sweep".
Here is the equation of linear sine sweep(from Wikipedia Chirp).
$$ x(t) = sin\biggl[ 2\pi( f_0 +\frac{f_1-f_0}{2T}t)t\biggr] $$
where,
$f_0$ is start frequency
$f_1$ is end frequency
$T$ is total length of excitation time.
In my case, I would like to calculate ... |
I want to learn how to go about analyzing some audio files I have acquired. Let's say the files contain some sort of repeating sound (e.g., water dripping), and I want to derive the pattern of the repeating sound. I use R for programming and analysis and have briefly introduced myself to the tuneR and seewave package... |
I am working on algorithms to separate mixtures of 'almost periodic' signals. One such example is composite ECG consisting of maternal and fetal signal.
Can anyone help with examples of such signals? The signal can also be from internet data.
|
Compressive Sensing is built on 2 properties: 1) the sparsity of the representation basis relative to the sampling basis and 2) the incoherence between the singular vectors from each of the 2 bases in a). On the surface this seems fine to me but he "incoherence" relationship is confusing me a little.
Some texts refer ... |
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