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I'm struggling with a signal analysis electrical engineering college assignment. We need to a derive differential equation for a low-pass filter, high-pass filter and a band pass filter (made by connecting the output of a low pass filter to the input of a high pass filter). Here are diagrams for reference:
Low pass fil... |
I have just bought a new video capture card whose output format is YUV 4:2:2 (as my old one) and surprisingly when I capture images with both cards I get different results. Differences are very small (have to zoom on edges if you want to see something) but I would like to know where do they come from? I was wondering i... |
For a certain experiment of which I have data, I want to calculate the autocorrelation of the measurements. For this I used the expression from Wikipedia, which reads
Here, $n$ is the dataset's size, $0 < k < n$, $\sigma$ is the standard deviation and $\mu$ is the mean.
Now, I've read the descriptions on the page, bu... |
I have the the noisy curve defined by numpy 2D array:
As you can see, it has the first flat segment, then rise, peak and decay phases. I need to find the starting point of the rise phase, marked here by the red dot. What algorythm can I use for that? I need it to be as noise-tolerant as possible.
|
I was thinking sometime back about how to explain the Continuous Wavelet Transform ELI5. So this is what I came across.
The correlation of two exact signals is 1. So if I have an input signal $f(x)$ made up of an array of frequencies, how can I find out what frequencies exist at what points? Well, slide a signal $m(y)$... |
I am having a problem understanding how the author gets the onset envelope of an audio song in this paper.
The entire section in question has been quoted below:
First the input sound is resampled to 8 kHz, then we calculate the
short-term Fourier transform (STFT) magnitude (spectrogram) using 32
ms windows and 4 m... |
How can I convert a time signal (audio) into the frequency domain, multiply frequency amplitudes by a vector of scalars, and convert it back into the time domain, without messing up timing information (ringing?)?
Some context:
I am calibrating ultrasonic speakers. I have a frequency roll-off curve of the attenuation dB... |
i am trying to reconstruct time series from SSA ,because according to this link
http://en.wikipedia.org/wiki/Singular_spectrum_analysis
there is procedure
4th step: Diagonal averaging.
i have with started following code
clear all;
B=xlsread('data_generations1','A1','g8:g301');
n=length(B);
l =input('Give the ... |
For my project, I needed to detect the primary oscillation frequency in a signal data. As I googled around, it turns out that DCT is the best tool to find this (http://www.mech.pku.edu.cn/robot/teacher/wangjiandong/WangHuangLu_ImprovedDCT_CEP_2013.pdf)
My question is: why would you base the analysis on DCT, and not DF... |
I am trying to understand some basic concepts with IFFT as represented here OFDM Modem page 50-53, and 108-114.
Some basics that are represented -
The base sampling rate is 8khz.
The symbol period is 32ms, which would calculate to 250 total samples.
The fft size is 64.
The bin separations are 32hz.
The bandwidth used i... |
I have a time series (of 23 timestamps) of which I take the Fourier transform. Now the fourier transform has 23 imaginary values and each has an amplitude and a phase. When I get the phase angle, it given me arctan value of the angle. Now how can I determine if two fourier coefficients are in phase or out of phase.
|
If I have a time series (for eg. for 23 timestamps) and if I plot it and see that it is bimodal, that means it might be having high value of second fourier coefficient (with frequency = 2). But when I do the fourier transform I find that the value of second fourier coefficient is very low.
Now, is the following reasoni... |
Connected with this topic , I would like to have some clarifications about the Fourier Transform and the Python tools that make it.
Having my data set whose plot is showed in the above link, my array of data is stored in rate. Then, if I check the result from the Fourier transform:
yfft = np.fft.rfft(rate)
y_smooth = n... |
I have two sound clips $C_1,C_2$ which are pretty similar. I'd like to measure how perceptually similar they are, i.e., how similar a human would perceive the two to be. Is there a way to use a lossy compression algorithm (e.g., a MP3, AAC, or Ogg Vorbis encoder) to compare the two clips?
It occurs to me that that au... |
I have been reading about eigen values and eigen vectors but I haven't been able to find any decent explanation relating their application in Image Processing / Computer Vision.
For example, How can those be used for face detection and eye detection? Can somebody please through some light on this?
|
let say we have some data,some signal written in this form
$x(t)=s(t)+\epsilon(t)$
where $s(t)$ is pure signal and $\epsilon(t)$ is white noise with mean zero and some variance ,question is that if we have enough sample data,should periodogram always estimate frequencies correctly?let say we have following sin... |
I am reading Direct Synthesis versus Wavetable Synthesis. The quote below explains code I have read but I don't get why it's a division by the integer multiple, when multiples increase in frequency. Doesn't that mean we need more samples (higher sample rate mapping to more samples for same accuracy) to deal with the hi... |
let us consider following graph of singular values
i want to make some kind of clustering of these data,namely to seperate main components from non main components,let say signal components from noise components,i would like to do like this(any software matlab,etc is great,better matlab)let us start like this ,f... |
My problem should probably be built up from the beginning, so lets start there. I performed a certain experiment 25 times. Every time, the experiment consists of 5000 measurements, and each measurement returns either 1 ('yes') or 0 ('no'). I know that each time I measure 1, the probability that this measurement is corr... |
I read that multiplication is convolution in frequency domain. I also understand that convolution is just polynomial multiplication. Can somebody explain what are the advantages of doing convolution in frequency domain? Also, i would like to know how to multiply two signals in time domain and what is the significance o... |
I have a discrete signal of random length (let's say between 500 and 800 in time). This signal has an important information which I want to collect and to put it together in a feature vector to train a classifier. The signal also comes in random phase and in random scale (it depends on the distance to the sensor).
So t... |
How can you filter out a person's voice from a group of people talking?
We have a sample of each person's voice from the group, and the sample of the entire group talking at once. Both samples are uploaded into matlab for analysis.
Is there a way to single out any one person's voice?
|
I am trying to do the complex trace analysis of a seismic trace in Matlab where I need to calculate the instantaneous frequency of a discrete signal. I have used the formula according to Barnes. I am running an algorithm where I need to iteratively run complex trace analysis on the residual trace obtained after subtrac... |
This would most likely be the opposite of this question ( Mathematically inclined Signal and Systems/Signal Processing book? ) I figured I'd ask here if there are any good books that while, necessarily, focus on the math are more oriented to what these concepts can DO instead of the mathematics behind it, so I guess mo... |
I found a really intuitive explanation of Discrete Fourier Transform here.
To summarize the author's approach briefly :
What if any signal could be made from circular motion (repeating cycles) ? This is the central theme of Fourier Transform
Every circular path needs a size, speed, and starting angle (amplitude/freq... |
I am trying to develop some code to find a transient signal in a data set I have. Before I get there however I am trying to write code using simulated data.
I first am creating a signal with a specified frequency and then adding white noise to it.
I then iterate through a loop where I create a reference signal at an i... |
I was trying to understand the Otsu thresholding algorithm in image processing. For that purpose I found a useful link. I got the algorithm flow, but a fundamental doubt arises. Why 'minimum within class variance' ${\sigma_W}^2$ (notation given in the link) gives the optimum threshold? Please can someone clear my doubt... |
Is it a realistic mapping to divide the frequency bins in 3 parts, high/mid/low frequencies?
How can these bins then be manipulated to control the level of these bands in the time domain?
Is it sufficient to adjust these bin segments and do an iFFT to time domain?
|
From discussions all over the internet, I understand that in a 512 sample point fft, only the first 256 contain relevant information provided that my signal is real. The other half contains complex conjugates of the first half. I base my question on this discussion at stack exchange.
I'm trying to plot the fft of a wav... |
I'm trying to measure the angle between two needle positions in an analog meter (gauge).
such as:
After the image processing of several images, I get the processed image below(a image show different needle positions:
Here, the black dot points were the feature points of needle area, so I use the line fitting algorith... |
I know that the gradient function is supported by MATLAB, but the local gradient is not, so how do you calculate it?
Local gradient is another texture descriptor, which is defined as:
$$I_g=\sum_{z=-r}^{r} | \nabla I(x+\tau) |^2 $$
|
Suppose that a signal is decomposed by using discrete wavelet transform (DWT) and transmitted. Is it possible for receiver to find which type of wavelet is applied in transmitter side ?
I mean, if the signal is decomposed by Haar or DB and then reconstructed. Is it have any way to know the type of wavelet (like haar) t... |
I have a conventional phaser setup with allpass filters and feedback.
I can calculate the peaks frequencies of the phaser when the allpass delays are set to 1 (then they work as simple one sample delays). Adding two allpass delays will give an additional peak, and the peak frequencies for peaks i = 1 to N is found by: ... |
I've got following problem:
assume you've this continous system 1st order:
$$ H(s) = \frac{1}{1+s} $$
s = tf('s');
sys = 1/(1+s);
I'm going to discretize this system via impulse invariant transformation and plot the results.
sysD = c2d(sys,1e-3,'impulse');
impulse(sys);
hold all;
impulse(sysD);
So this seems to work... |
I'm currently studying sound design, however over the past couple of years i started creating audio effects/instruments. I have also been programming in C++ for quite some years.
I noticed my shortcomings though; i can design compressors, envelopes and simple stuff like additive synthesis quite well along with basic s... |
I'm currently doing my final year Degree in computing studies.
The project I'm working on is a video of a webcam or computer webcam to have 2 pre-defined ROI (Region of Interest) on top and bottom of the video. It is to detect a person when he does a simple push up whether he reaches the area of both top and bottom RO... |
I am measuring the phase shift between two pseudorandom signals using correlation ifft(A.conjugate()*B) and picking out the maximum).
That works very well, but takes a lot of time. I roughly know where the peaks are, and don't need the correlation for other shifts.
Is there an adaptive cross-correllation algorithm that... |
I working on writing a program to get the BPM rate and the Beat Times in audio songs but I am having trouble trying to come up with reliable testing strategies for my design.What do I benchmark my BPM rates and Beat Times against? Should I just use other softwares or is there ways of checking if my BPM rates and beat t... |
guys! I have carried out some experiments using matlab warp tools from here. But the results are not good, so I decide to read its original paper Principal Warps: Thin-Plate Splines and the Decomposition of Deformations from here to find reasons. However, I am stuck to part II.....
It says the energy function $\mathbf{... |
I'm currently working on a piece of DSP/Synthesis software and I have run into the issue of generating band limited waveforms. I have been doing some research to try and find a good solution but I haven't had much luck. I have found some things about a BLIT to generate complex waveforms but I have not found a good exam... |
float xx = acceleration.x;
float yy = acceleration.y;
float zz = acceleration.z;
float dot = (px * xx) + (py * yy) + (pz * zz);
float a = ABS(sqrt(px * px + py * py + pz * pz));
float b = ABS(sqrt(xx * xx + yy * yy + zz * zz));
dot /= (a * b);
I run into the equation above on github, but I don't know what kind of DS... |
Can somebody please explain how Photoshop vibrance function can use in opencv c++ ? so that I may reproduce the same effects in my application. Here is the vibrance documentation
|
In Matlab we use below function to read an image :
var = imread('IMAGE PATH');
But, how to do same thing in Scilab ?
|
I am using OpenCV C++ for making the blending mode like in photoshop, I want to make overlay mode in it. I search its alternate in OpenCV in which I found this blending way, but its not the overlay as I want to use the overlay method in it.
Overlay method formula from this documentation
(Target > 0.5) * (1 - (1-2*(Targ... |
Could someone please provide a method for inverting random fixed point numbers.
I have as an input both positive and negative floating point numbers that should be converted into fixed point and then be inverted.
An example could be 1/0.2453 where floating-point 0.2453 is converted into a Q18 fixed point format and the... |
I have three signals (below) each having the same standard deviation, however, are clearly very different temporally.
Is there some such metric that could be calculated for each of these signals to give an indication of how they vary over time, such as a measure of continuousness or intermittency if such a metric exis... |
I have recently started learning DSP and the book that I am reading challenges the readers to find a:
continuous time-domain electrical signal that only has a finite number
of amplitude values
I obviously could not think of an example and hence I am here.
Please suggest an example of continuous electrical signal t... |
I'm pretty new to Image Processing and am using MatLab.
I have an problem were I take an image of light passing trough an set of optical fibers (bundled together) and one were I pass laser energy trough the same bundle of fibers to burn the image of these fibers onto paper.
I then try to match these two. Up to now I j... |
I plotted a sine wave(blue) and a 90 degrees phase shifted cosine wave (red) expecting them to overlap each other.
x = 0:0.001:1;
%ploting sine
y = sin(2*pi*x);
plot(x, y);
hold('on');
%ploting cosine
z = cos(2*pi*x-90);
plot(x, z);
The two graphs do not overlap.
Whats wrong with my assumption ?
|
I have an image :
img = imread('pic.jpg');
Now, How can I get spectrum of that image?
|
Its true that HTC one M8 uses dual camera to achieve the 3D Dimension plus effect, but can anybody tell what is it called, if its a series of image manipulation?
Demonstrated here,
Video
|
I was watching this video where the presenter remarks:
For a discrete signal, time shift corresponds to phase change in a discrete signal but not vice versa.
I was trying to figure out how this could be proved. For example, if our discrete signal is
$f[n] = A \cos(\Omega_o n + n_o)$ where $ n,n_o \in Z$
If the sign... |
In a book [1], gives an equation (equation 5.31 in the book) for estimating frequency offset in OFDM systems proposed by Classen. the procedure is:
first, two OFDM symbols, $y_l [n]$ and $y_{l+D} [n]$ , are saved in a memory after synchronization. then, the signals are transformed into ${Y_l [k]}_{k=0}^{N-1}$ and ${Y... |
I have images like below:
I want to find some measures describing black spots dispersion and diversity.
First measures I use are mass center off all black spots, mean area of spot, stdev of area need more ideas.
I want measures to describe irregularity, differences etc.
|
Why is FFT a good method for detection of bearing faults? Why can't we do the analysis in time-domain?
|
I am new to the topic of system identification and looking for a large Autoregressive (AR) model. Can anybody point out a large stable AR model which has more than 2 coefficients AND there should be a large number of zero coefficients?
This link presents an example of how to have nonzero coefficients in lag 1,4 for or... |
There are many algorithms that can calculate FFT. Even with Cooley–Tukey FFT algorithm, different radix can be used and the algorithms can divided into decimation in time and decimation in frequency. Any comment on how to choose these algorithms in practice?
|
For a given time series which is n timestamps in length, we can take Discrete Wavelet Transform (using 'Haar' wavelets), then we get (for an example, in Python) -
>>> import pywt
>>> ts = [2, 56, 3, 22, 3, 4, 56, 7, 8, 9, 44, 23, 1, 4, 6, 2]
>>> (ca, cd) = pywt.dwt(ts,'haar')
>>> ca
array([ 41.01219331, 17.67766953, ... |
I want to implement the equalizer in matlab. I am just learning this. I want a good kick start code that can help me to learn it further. I searched a lot on Google but do not find a good reference code to start. I have a received signal in matlab that is modulated with QAM-16 modulation and passed through AWGN Noise. ... |
I have rich experience signal-processing, but haven't touched image processing since my happy university days... so:
Working on a side project, I need to enhance ridges (continuous lines) in a 2D grey-scale image. Using Matlab, I'm at a point where Canny edge detection does a great job, but since many lines are thick, ... |
Hi I need to simulate a simple multipath channel in matlab through which I can send my OFDM transmission signal, I want to test my OFDM receiver design.
So far I have:
%% Passing through Channel
nIFFT = 4096;
% Create channel
channel = randn(1,nIFFT) + sqrt(-1)*randn(1,nIFFT);
% cext_data is the signal to be transmit... |
I try to resolve false edge problem in image segmentation. Let see its defination in Figure. The false edge problem often occurs in inhomogeneity image, especially for medical image. I am finding the method or feature to resolve it and achieve real edge. I try to apply some existing method example: localizing active co... |
I have a dataset that contains multiple channels recorded over time (think EEG or EMG), and I'm working on a computational model for this data. When I have a working version of the model, I'd like to compare the model's predictions to some held-out test recordings. I thought it would be nice use some sort of signal-to-... |
I'm trying to compute the impulse response for the following system:
$$
y(n) = \frac{1}{2} \left( x(n) + x(n-1) \right) + \frac{1}{2} y(n-1)
$$
and am told to assume that $y(-1)=0$.
My solution: Letting $x(n) = \delta(n)$, we have
$$
h(n) = \frac{1}{2}\left(\delta(n) + \delta(n-1)\right) + \frac{1}{2}h(n-1).
$$
Pluggin... |
I am looking at data like this:
Source data: http://pastebin.com/raw.php?i=L6cd8d5K
The data is quasi-periodic, there is a distinct cycle but it is not an exact repeat, and the period changes considerably. I would like to find accurate peak positions, and period durations, for each cycle. Ideally the peak positions ... |
Hi I am trying to get the image size of the uploaded image in MATLAB. So far I have got :
read=imread(image.png)
ymax=size(read) (1);
xmax=size(read) (2);
However this gives me an error. The image size is 300px by 256px, and I want my ymax and xmax to automatically get the pixel values. How do I do this?
|
I'm reading a material where it says that a filter mask or kernel can be separable if the matrix of the filter mask has a rank 1. The two slides which describes this are as below:
Reading these slides it seems to me that it's trying to mean that the averaging filter can be separable, while Laplacian of Gaussian(LoG) i... |
For fun, I computed the FFT of a pure sine wave. I chose chose the sample length to be an even multiple of the signal period, so that I don't see windowing-effects. Here is the Matlab code that I used:
% Signal properties
f_signal = 1000;
% Sampling properties
f_sample = 4000;
T_total = 100;
% Calculate signal vector... |
Morse code dots and dashes are often displayed as a sound, or light that is on for a short or long period of time.
What if the only way to communicate was by knocking.... (or similar encoding) that can only encode using extended (or short) durations of silence.
Is it acceptable to use morse code in this way (where shor... |
I have one problem that need you help. I am try to find the relationship between active contour and thickness information. For defination of thickness we can find at thickness measuring and active contour at chan-vese model. Could you sugess me method or idea to find the thickness of active contour (is called phi) as s... |
I mean some kind of system may dislike some special frequencies and there may be absorption lines.
Can somebody give some example?
You can lots of emission lines below. But is it possible the PSD is just a continuum with several absorption lines?
|
I am trying to match images from a large dataset which exactly match the given input image.(images with deformations/transformations are treated as different)
I have tried euclidean distance but it isn't very scalable. I have also tried matching gradient magnitude and orientation pixel by pixel, but again it seems to w... |
I'm trying to work my way through a paper I found online, titled "Three Models of Wind-Gust Disturbances for the Analysis of Antenna Pointing Accuracy" by W. Gawronski, 2002.
http://ipnpr.jpl.nasa.gov/progress_report/42-149/149A.pdf
In the Appendix of the paper, Section I, the author outlines an approach to generate a... |
HI I have these specification for an OFDM program I was wondering, what is the bandwidth and the sampling frequency? I'm not a student of Digital signal processing, hence I am so confused.
ymax=100;
nIFFT = 2048;
nCyclic = nIFFT/4;
pilot_distance = 16;
pilot_amplitude = 2;
offset = nIFFT*3;
% total number of complex sa... |
I am experimenting with image down-sampling and would like to calculate a numerical magnitude for alias-induced moiré patterns. Is it possible to do this by analyzing the frequency-domain (FFT) of the input image and knowing the relative sampling rate?
Assume that I have already applied any pre-sample filtering prior ... |
I wrote matlab code for face detection.In my code it is detecting face for first 100 frames and it crop faces from each frame and saves it in database folder.Problems iam facing
1.Detecting face frame by frame is very slow.Is there any idea to run faster since i have to work on 4000 frames.
2.In my database folder it h... |
I have been working frequency offset estimation in OFDM. The objective was to compare different frequency offset estimation techniques. By using MATLAB, I have simulated three different estimation techniques, namely:
By using Pilot tones
Using phase difference between two repetitive symbols (proposed by Moose)
and by... |
Looking for a solution to the following problem:
A signal $x(t)$ is band limited to $B$ Hz, and sampled above the
Nyquist rate, with corresponding $f_s = 1/T$. If the sampled signal is
given by
$$ y(n) = x(nT), $$
describe how to compute the phase-shifted sampled signal
$$ z(n) = x(nT + T/2), $$
from the samples $... |
I want to make the same thing programmatically like Color balance in Photoshop , like in below image
if we have same bar positions in Photoshop then how we can make them in OpenCV , because the problem which I am not understanding is that we have the image with RGB format yes we can convert in other color format but h... |
I study image processing and I am new to it. so my question is for example what is the impulse response for:
$$ y(m,n) = 3\times x(m,n)+9 $$
$$ y(m,n) = m^2n^2 \times x(m,n) $$
where the $y(m,n)$ is output and $x(m,n)$ is input.
thanks.
|
In steepest descent
methods of minimizing a function $f(x), x \in \mathbb{R}^d$,
it's common to approximate the gradient by finite differences:
$\qquad\qquad \nabla f(x) \approx gradest( x; h ) \equiv
{ {f( x + h I ) \ - \ f(x)} \over h } $
then minimize along those directions:
$\qquad\qquad x_{k+1} \ \text{from min}... |
I'm looking for an introductory book to time-frequency analysis. The book should be practical in nature and not mathematics heavy. Suggestions?
|
I want to design FIR low-pass filter with the following specifications:
Cut-off frequency: 200 Hz
Order: 20
Sampling frequency: 1000 Hz
what should be the stepwise method to do so
|
I'm preparing a digital signal/image processing introductory course and, besides the theory and practices I want the students to read and discuss a couple of research papers during the last one or two classes. It doesn't matter if the papers are new I just want to expose the students some first hand research material i... |
From this previous post, the real and imaginary parts of the Fourier transform of a zero mean Gaussian are uncorrelated (and i.i.d. Gaussians)
This some how seems counter-intuitive. It seems if the real part has a large intensity, then the imaginary part should be small. I read through the proof linked from the previou... |
I am trying to isolate (or segment to be precise) the vein pattern from Infra red image of a finger (using MATLAB) like shown below:
So my output will be a binary image like (not the exact dimension of image shown):
I tried histogram equalization to make the veins more visible, but it was not that successful. Any hel... |
I am having great time while reading "The Scientist and Engineer's Guide to Digital Signal Processing" book.
In "Chapter-14 Introduction to Filters" author indicates we can create high pass filter from low pass filters by multiplying low pass filter's frequency kernel with a sinusodial which has 0.5 frequency. Link to... |
I'm looking for a suitable measure in order to quantify the asymmetry of a signal. I've read this: Detect signals degree of imbalance and this: How to measure the agreement between to curves? but I can't see how they apply to my case.
So this is the part of the signal that I am interested in:
The red line shows the ori... |
I have a hard problem that need your help. I have a binary image that maintains some unwanted region (small white dot) and hole regions (in figure 1).My idea is that the first I will remove unwanted region by calculating area these region and then filter with small area value.At the second step, I fill in hole region t... |
I have an formula for this "Maximum Quantization Error" but i dont know what it is based in. Its just thrown in my study material without further explanation.
It is defined as:
$$Q = \dfrac {\Delta x}{2^{N+1}}$$
where $N$ is the number of bits used for quantization in a analog to digital conversion, and $\Delta x$ is, ... |
Consider a signal that can be expressed as a linear combinations of exponentials:
$x(n) = \sum_{k=1}^K c_k z_k^n$
I would like to estimate the poles $z_k$ and I was told that I could estimate them by calculating the SVD of the Hankel matrix of the observations $\mathbf{H}$:
$\mathbf{H} = \left(\begin{array}{cccc}x(1) &... |
I have written this function in matlab
function [A] = intmat(a,b,N)
M = length(a);
A = zeros(M,N);
for m = 1 : M
for n = 1 : N
my_func = @(t) (t^(N-n));
A(m,n) = quad(my_func,a(m),b(m));
end
end
end
Now when i use this function for a = [1 2 3 4 5] and b = [1 2 3 4 5] and N = 5
i.e is run the stat... |
Suppose we have a complex signal $\cos(2\theta) + j\sin(2\theta) = e^{j2\theta}$. Is there any way to find half-angle $\cos(\theta) + j\sin(\theta) = e^{j\theta}$ complex signal without going into polar form and preferably with no divisions? Iterative algorithms are fine.
|
This is a continuation of the discussion here. I would comment there, but I don't have 50 rep so I'm asking a new question.
Here's how I understand the DCT step in the MFCC calculation process: The rationale behind it is to separate the correlation in the log-spectral magnitudes (from the filterbank) due to the overlap... |
I need to do a perspective transformation on an image section from newspaper, here the girl's image. The section's coordinates are given as rough estimates. I need to find the boundary of the section and do a perspective transformation. I had been referring the following link.
http://opencv-code.com/tutorials/automati... |
Reconstructing a speech signal from a collection of MFCC vectors seems to work pretty well, but I've heard that one advantage of MFCCs is speaker-independence i.e. they are more-or-less the same across different speakers for a given phoneme. How then can a speech signal, with all its speaker-dependent idiosyncrasies (a... |
Say $\alpha$ is a complex random variable, then which one of the following expressions is correct?
$\mathbb{E}[\alpha^2]$ or
$\mathbb{E}[\alpha \alpha^*]$?
|
I've read that upsampling performed in digital music playback can color the sound, produce artifacts, etc. For example, an audio file ripped from a CD might be 44.1Khz/16-bit, and then upconverted to 48Khz/16-bit and played via an optical digital audio output. Audiophiles say this is bad because the signal needs to b... |
On Wikipedia I found the Hann-Poisson window, and the article claims the spectrum is smooth, but it isn't theoretically smooth, as it turns out. In practice you achieve partial smoothness by jacking up its $\alpha$ parameter.
Can I find what I'm looking for in a function with finite support? Is it mathematically possib... |
I have an imaging problem. I essentially have a metallic plate with a number of holes through it. I am looking at the number of holes with a thermal camera. While looking at the plate I have two phases of this analysis, 1.a source of hot fluid is flowing through the holes and behind the plate 2.a source of cold flui... |
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