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# Vieniava

Active since 2011

freelancer from Poland
Professional Interests: signal processing, digital/analog communications, RF, Software Defined Radio, Cognitive Radio, SIGINT, COMINT, radiomonitoring, steganography, algotrading, forex, image processing, photography, pattern classification, statistics

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check this out: <http://www.mathworks.com/help/releases/R2012a/techdoc/creating_plots/f0-4741.html Adding text annotations to g...

8 years ago | 1

How can i add echo to a signal
For example: to add an echo after 1s (with amplitude=0.1, phase=pi/3.5) and echo after 1.5 seconds (with a=0.5 and phase=1.2*pi)...

10 years ago | 1

Getting rid of a black background surrounding an Image
[row col pg] = size(bg); pg = zeros(row,col,'uint8'); gr = 255*ones(row,col,'uint8'); canv = cat(3,pg,gr,pg); image(canv)

10 years ago | 0

Compute PSD from fft compared with spectrogram
Spectrogram is time-frequency (3D=time vs freq. vs amplitude) representation of a signal and periodogram/fft is frequency only (...

10 years ago | 0

IFFT of Gaussian-filtered real signal is complex - why?
Your Gaussian filter is *NOT* symmetric in frequency domain. Check this out: stem(fftshift(gaussFilter)) it suppose...

10 years ago | 1

How can i add echo to a signal
load handel; echo_delay = 0.5; % in seconds echo_delay_s = round(echo_delay*Fs); % delay in samples ...

10 years ago | 1

How to get the number of bin and bin edges from chi2gof test
Use this kind [h,p,stats] = chi2gof(...) Then: NumberOfBins = numel(stats.O); And boundaries of i-th bin are: ...

11 years ago | 0

How to reconstruct a sound with data in MATLAB?
Try this: fs=8000; soundsc( pressure-mean(pressure), fs) You should know sampling frequency used in data collecting - here...

11 years ago | 0

which TI's MCUs are supported by Matlab

12 years ago | 0

User Defined Function syntax
*Function hints* this is all about. In MATLAB R2008b writing your own hints is not possible - check response #7 on <http://blogs...

12 years ago | 4

| accepted

Phase-plot when using freqz
It is a matter of expressing angle in degrees or radians. Replace: plot(w,angle(H)) with plot(w, 360/(2*pi)*angle(...

12 years ago | 1

| accepted

Referencing the name "MATLAB"
spelling: <http://www.mathworks.com/products/> EDIT (Good point, Andrew!) pronunciation: load mtlb sound(mtlb)

12 years ago | 1

Unstable streaming from external device
I suggest you to use |serial| as in <http://www.mathworks.com/help/techdoc/matlab_external/bytesavailablefcn.html>. Here is how...

12 years ago | 0

Ouputting for loop into a matrix
Try this: Ci=0.1:0.1:30; Cd=0.1:0.1:30; y=zeros(numel(Ci), numel(Cd)); for i=1:numel(Ci) for j=1:numel(Cd) y...

12 years ago | 1

USRP N210 Interfacing
No. Currently USRP N210 (it uses UHD) cannot be run in Simulink.

12 years ago | 2

DSSS Plotting
Try this: plot(20*log(abs(fft(DSSS_time_domain_signal))))

12 years ago | 0

How to find the maximal and minimal derivatives of noisy signals?
*Differentiator filter* should satisfy your needs. You can use it in your mfile - <http://www.mathworks.com/help/toolbox/filter...

12 years ago | 0

Uitable's properties
you can simply check the set of properties via: hT=uitable; get(hT)

12 years ago | 1

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Question

I found that within EU there are significant differences in pricing (incl. tax rates and currency exchange). So the question is....

12 years ago | 1 answer | 0

### 1

Question

For example my email could be masked as follows: [char([21 8 4 13 8 0 21 0]+97) '@gmail.com'] But this is trivial and very r...

12 years ago | 5 answers | 1

### 5

* replace *votes* by *voting points* IMHO, voting should be connected with reputation (of a person who does the act of voting ...

12 years ago | 0

want m fille
<http://www.mathworks.com/products/wavelet/demos.html Wavelet Toolbox demos>

12 years ago | 0

How do I divide an image into blocks for processing?
Suppose *|I|* is your image matrix. Trivial way is shown below: s=size(I); wing=1; % ;) bs=2*wing+1; % block...

12 years ago | 0

handling audio files
Check this out: % v1, v2 - two vectors are given len1=length(v1); len2=length(v2); % LEN=min(len1, len2); V1...

12 years ago | 0

| accepted

Vector scope.
The problem is in similar wave duration time and sampling time. You may increase your rate of simulation or slow your waveform....

12 years ago | 1

power spectral density of image
Try this: imagesc( log10(abs(fftshift(fft2(Picture))).^2 ))

12 years ago | 0

normalisation of frequency axis while using fft function in matlab
You must know frequency sampling, *Fs* . Look at this code: Fs= ; % insert here your frequency sampling in Hz L=length(Va...

12 years ago | 0

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1D array, elements are 2D matrix [test]

12 years ago | 0

delimiter usage
It seems to be impossible to use two-spaces-delimiter. You can try make your own *|dlmwrite|* function by edit the original. T...

12 years ago | 1

| accepted