0
votes
0answers
5 views

How to calculate these Jacobian matrices

While trying to understand this paper: http://www.icg.tugraz.at/publications/pdf/ismar2013_userfriendlyslaminitialization/at_download/file I got stuck on section 3.1, where the Jacobian matrices are ...
0
votes
0answers
4 views

Low pass filter to maintain edge information

I am looking for a kernel as low pass filter that satisfy as:I must find a kernel that statisfies as follows: In the my reference paper, the author suggest gaussian kernel that is The gaussian ...
-1
votes
0answers
10 views

how can i design the FIR Filters using window function in MATLAB ;without using inbuilt functions [on hold]

please provide me code for --> how can i design the FIR Filters using window function in MATLAB ;without using inbuilt functions.
-1
votes
0answers
8 views

image processing

If I have the histogram of an input image as Gaussian probability density function of the form: $$P_r(r)=\dfrac{1}{\sqrt{2\pi}\sigma}e^{-\dfrac{(r-m)^2}{2\sigma^2}} $$ where: $m$ and $\sigma$ are ...
1
vote
1answer
25 views

Exercise related to frequency resolution and SNR

I'm studying a book aboud dsp and trying to make excercises. Here is one I'm interested in: A scientist acquires 65,536 samples from an experiment at a sampling rate of 1 MHz. He knows that the ...
0
votes
0answers
22 views

Z-Transform amplitude

I've tried to compare the Bode plot of a discrete-time system with a manually computed Z-transform in Matlab like this: ...
1
vote
3answers
168 views

Number of FFT points required for a specific frequency resolution for an oversampled signal

I have a bandpass signal centered at 2 MHz and bandwidth of 50 kHz (the signal frequency varies from 2 MHz - 25 kHz to 2 MHz + 25 kHz). This signal is being sampled at 10 MHz. I want a frequency ...
0
votes
1answer
31 views

Comparison between average kernel and gaussian kernel?

In image processing, we have two kinds of major kernels that are average kernel and gaussian kernel. For image segmentation, which is difference between average kernel and gaussian kernel? I found ...
0
votes
0answers
6 views

Remeshing methods to obtain same number of vertices and faces in aligned meshes

I've a set of aligned meshes (human femura surfaces). I would need to remesh each of these surfaces so they have exactly the same number of vertices and triangles. I need this because I'm building a ...
0
votes
0answers
13 views

algorithm Matlab function 'stream2' and 'stream3' use to compute streamline

Can anyone explain how the MATLAB functions: stream2(x,y,z,u,v,startx,starty) and stream3(x,y,z,u,v,startx,starty) compute stream lines from vector data u and v? In the stream2.m file, it calls the ...
1
vote
2answers
74 views

Trignometric Fourier series representation of a continous time signal

While learning Fourier series I read the definitions of representation for a continuous time signal $x(t)$ as: $$x(t)=A_0 + 2 \sum_{k=1}^{\infty} A_k \cos(k \omega_0 t) - B_k \sin(k \omega_0 t) ...
0
votes
1answer
37 views

Design and implementation of causal band-pass filter for biosignals - what to consider?

I currently work in a project of clinical software (C#) which deals with clinical biosignals, specifically EMG and other low-frequency signals (load-cells, goniometers, and other biomechanical ...
-1
votes
1answer
20 views

How is noise variance related to bandwidth?

I have to calculate asymptotic coding gain with soft decision decoding over an uncoded reference system. Lets say the coded system requires a bandwidth $k$ times higher than the bandwidth of the ...
1
vote
1answer
38 views

Writing a Discrete Fourier Transform program

I would like to write a DFT program using FFT. This is actually used for very large matrix-vector multiplication (10^8 * 10^8), which is simplified to a vector-to-vector convolution, and further ...
-1
votes
0answers
25 views

what are and why are sine and cosine modulated integrals used?

I have found the definition of the following formulas in a paper regarding active vibration control, where they are called sine and cosine modulated integrals. $y$ is measurement signal with a strong ...
0
votes
0answers
17 views

Clustering of overlapping windows (K Means)

I'm attempting the clustering of some of my data using a K-means Euclidean square method. I've broken the data down into small windows, 200 samples in size, but with a 50% overlap. I've chosen to use ...
0
votes
0answers
39 views

correct way to implement windowing

I'm trying to implement the windowing in a program, for that I've wrote a sin function with 2048 samples. I'm reading the values and trying to calculate the PSD using the "rect" window. When my window ...
0
votes
0answers
39 views

Least mean square filter diverging

I have used LMS algorithm to estimate signal in presence of high noise which includes chaotic and random. MSE values in db at each SNR for the coefficients is +ve eventhough I converted to Db scale. ...
0
votes
0answers
24 views

Measuring spectral tilt

I have quite a few noisy signals and I want to calculate their spectral tilt over time, preferably using a method from literature. So far, I can only come up with the slope of the line between the F0 ...
1
vote
1answer
40 views

What Information does the phase of a cross power spectra give me?

I obtain the cross power spectra by the following steps: compute the FFT of signal A and B Multiply A with the conjugate of B store it in C (cross power spectra) Now looking at the Phase of this ...
4
votes
1answer
66 views

“chirp” with arbitrary period

Say you have a linear chirp, which is a bit like a sinusoid with a gradually increasing period, but instead of the linearly increasing period, could you pick an arbitrary value, like the red line in ...
0
votes
2answers
77 views

Running an FFT filter on a large data set

I have a non realtime application where I need to run a bandpass FFT filter on a data array of between 5k and 10k data points. Do I break it up into (say) 256 point chunks, run the FFT on that and ...
0
votes
2answers
52 views

Generating a high SNR sinusoide with lut on a DSP

I'm generating a sinus by using a lut method on a DSPic33f. My sample rate is 48 kHz, so I saved 12000 of the first value (unsigned int, 16 bits) and use trigonometric formulas to calculate the other ...
0
votes
1answer
40 views

Determine whether a signal is periodic or not and get fundamental period

Here is my signal Cos(n/2)*cos(pi*n/4) cos(n/2) has period 4pi and cos(pi*n/4) has period 8 Now, the question is will the signal be periodic for fundamental ...
1
vote
1answer
34 views

Real Time Object Tracking using image processing

How we can track a single selected object from multiple detected moving objects using single fixed camara?
1
vote
1answer
50 views

FFT Matlab - Meaning of Frequency Vector

I'm following a tutorial about the FFT. It's well explained but I don't understand the meaning of the frequency vector: ...
2
votes
0answers
31 views

When does l1 regularisation give a sparse solution?

I was maximising a likelihood function, which is convex. I know that the system has a K-sparse solution. I wanted to know the conditions (or some sufficient conditions) on the likelihood function ...
-3
votes
0answers
34 views

Broad band transmission [on hold]

Why can't we send digital signal directly to the band pass channel?
-4
votes
0answers
26 views

Does voice copying consider the chemicals uracil and cytosine that make up words that are spoken? [on hold]

Can voice copying technology mimic/copy/fake someone's voice and then be added to a recording to make it appear that someone has said something that they have not said?
-2
votes
0answers
27 views

How to mimic/copy/fake someone's voice and then add it to a recording? [duplicate]

Does voice copying technology have the ability to copy uracil and cytosine the chemicals that create words that get spoken?
2
votes
1answer
53 views

Analog Hilbert transformer

I know the FIR approach, I have seen IIR, to, but I'd like to know if it's possible to implement a Hilbert transformer in analog domain, i.e. with integrators instead of delays. Is it possible? If ...
2
votes
1answer
80 views

How to model Tape Saturation (Audio DSP)?

I'm looking for info that would help me to build a Tape Saturation process. I'm working with the WebAudio API. The API provides a number of DSP nodes that perform basic processes, such as a Convolver ...
1
vote
1answer
51 views

How to remove background noise from sound file for analysis

I'm working on a project at my university and it involves background noise recognition/classification. I'm very new to this so I'm unsure what to really search/google or where to really begin any ...
-1
votes
0answers
22 views

Constant Q transform and time synchronisation

I'm looking to use the constant Q transform for onset detection and am having a bit of trouble aligning the time axis of the transform with actual note events. I'm using the CQT transform toolbox ...
-1
votes
0answers
28 views

What are the eigenvectors of Laplace/Z transform?

I understand that $\ddot{y} - a\dot{y} = 0$ then equation turns into $we^{iwt}-ae^{iwt} = 0$ and, further, into $w^2e^{iwt}-ae^{iwt} = 0$. So, $e^{iwt}$ is an eigenvector of differentiation opeartor, ...
3
votes
2answers
51 views

The role of GPS in INS/GPS navigation systems

Ideally, a gyroscope and an accelerometer would be enough for a complete navigation solution (attitude + position), using dead reckoning. This comprise the Inertial Navigation System, INS. In ...
0
votes
0answers
29 views

Conceptual question on information theory (Part1) [duplicate]

Shannon's entropy measures the information content by means of probability. Is it the information content or the information that increases or decreases with entropy? Increase in entropy means that ...
0
votes
0answers
30 views

Confusion related to terms: information, information content and entropy (Part2)

Shannon's entropy measures the information content by means of probability. Is it the information content or the information that increases or decreases with entropy? Increase in entropy means that ...
1
vote
1answer
44 views

Difficulties in understanding mutual information concept

For two signals or random variables to be independent, the mutual information (MI) must be zero. Let, $error = X -Y$ where X is the desired signal and Y is the measured signal. It is desired that ...
0
votes
1answer
31 views

Approximate a system frequency response with a filter in Matlab

suppose I know the frequency response of a (linear) model approximating a real physical system but only at a specific frequency $f_0$ (so basically I have a complex number whose module is the ...
-3
votes
1answer
26 views

What are some example of applications for LTI systems

I'm giving a lecture on LTI systems. I encountered some questions: for a discrete LTI system H with impulse response h, is the system applied on signal x(t) equals x*h - normal discrete convolution ...
0
votes
1answer
34 views

Make a movie from multiple images in MATLAB

I have 10 images in the folder say "D:\images\" named as frame1,frame2,...,frame10. I want to make a movie from the color images with frame rate as per choice.Also i want to save created video file in ...
1
vote
0answers
16 views

Low dimensional system identification algorithms

I'm a physics Phd student and just have a self-taught knowledge about lti-systems. After a while I found out that several techniques such as heat capacity or thermal-conductance measurements can be ...
-1
votes
0answers
15 views

Price of a hyperspectral camera?

Browsing through the questions on this site, I see that there are many about processing hyperspectral images. Because hyperspectral cameras are still not too common, it is difficult to find the price ...
0
votes
0answers
21 views

Confusion related to entropy and information

In general, entropy of a signal or image conveys the uncertainty and it is a measure of impurity. Information on the other hand tells us about how certain we are about the data. It is a measure of ...
0
votes
1answer
9 views

coefficients of farrow structure

what is the method for generating coefficients for farrow structure in matlab. I am designing a low pass filter using firpm but the output of farrow structure is not delayed.
2
votes
1answer
42 views

Conceptual question on entropy and its relation to information

Learning Informative Statistics: A Nonparametric Approach paper presents an approach to parameter estimation by entropy minimization. There are other related works "Minimum-entropy estimation in ...
0
votes
1answer
47 views

How to simulate AWGN in communication systems for specific bandwidth

I am trying to generate a AWGN waveform to add it to the signal of my simulated communication system. The operating bandwidth of the communication system is about ...
0
votes
1answer
55 views

YIN Pitch detection Algortithm ( how do I improve my results )

I am using YIN algorithm in a school project of mine which uses pitch detection on guitar sound. I when I play a note I get random frequencies at the beginning until they stabilize. I am thinking ...
0
votes
1answer
28 views

How to normalize frequency in MATLAB

I know all about conversion of frequency from HZ to normalized frequency and from normalized frequency to angular frequency ,but I wonder how it is done in MATLAB. I have the following code: ...

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