# All Questions

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 ...
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 ...
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.
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 ...
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 ...
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: ...
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 ...
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 ...
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 ...
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 ...
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) ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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. ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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?
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: ...
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 ...
34 views

### Broad band transmission [on hold]

Why can't we send digital signal directly to the band pass channel?
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?
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### 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?
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 ...
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 ...
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 ...
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 ...
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, ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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.
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 ...
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 ...