Audio jamming using white gaussian noise (matlab code)Hi anybdy have any idea how can a baseband audio sound can be supressed
or jammed using a white gaussian noise and how the result can be shown
in Matlab. any help will be appreciated. -Shruti
...
how to generate gaussian noise and gaussian filter in matlab?Hi,
I am a newbie in matlab and dsp. I have a signal and would like to
generate gaussian noise and use a gaussian filter to remove the
noise. From what i have gathered from matlab, to generate gaussian
noise i would use randn(1,256) to generate gaussian noise and add it
to my signal. However, i am not certain on how to remove the gaussian
noise i have generated. Any help is greatly appreciated on how to
generate the filter.
My code would be :
noise=radn(1,256);
signal=orginalsignal.*noise;
Thanks.
Newbie
...
How to add white gaussian noise or any other noise in sgnal waveform and normlize it?In one signal waveform has been normalized by flicker noise as below.
f= 0:100; % frequency points
fn = 100; % Nyquist rate
F= f/fn; % frequency vector
M= abs(100./sqrt(f)); % normalized fequency response
M= [zeros(1,6),M(6:100)]; % bound from zero frequency
[b1,a1] = yulewalk(3,F,M); % generate order=3 filter
And then using this b1,a1 co efficient graph has been drawn,
I want to do same thing using any other noise like white Gaussian noise or other, how can I do it?
I am from IT back ground so don't know well how to play with signals, please help....
Have you looked at the randn() function?
...
will subsampled 2-D Gaussian White noise still be white?Hi, everyone:
I generated a 2-D matrix with spatially-uniform Gaussian
White noise.
Then I fourier transformed the matrix to frequency domain,
and sub-sampled it by a factor of 4. Since the the
sampling rate is only 1/4 of Nyquist, there will be
aliasing in the new matrix. So the new noise distribution
is no longer spatially uniform.
But will this non-uniform spatial distribution change the
power spectrum density of original white noise?
Can I say that the resultant noise is not white noise?
Thanks a lot!
On Sep 1, 5:19=A0am, "sheng fang" <maelstro...@gmail.com> wrot...
aboute white gaussian noiseHi, I used wgn function generate a white Gaussian noise sequences. I had thought the sequences' spectrum is like a white noise , but I finded that the spectrum is like noise. This confuse me much . Could you comment on this? Thanks a lot. here is how I call wgn function: my_noise=wgn(1,1024,1,'linear');
"agump xiaoyong" <agump123@gmail.com> wrote in message
news:gjfde6$m9r$1@fred.mathworks.com...
> Hi, I used wgn function generate a white Gaussian noise sequences. I had
> thought the sequences' spectrum is like a white noise , but I finded
> that the spectrum is like noise. This confuse me much . Could you comment
> on this? Thanks a lot. here is how I call wgn function:
> my_noise=wgn(1,1024,1,'linear');"
I am not sure I understand you. But may be you are thinking that white noise
is Gaussian noise? May be this from wikipedia might help
http://en.wikipedia.org/wiki/White_noise
"It is often incorrectly assumed that Gaussian noise (i.e., noise with a
Gaussian amplitude distribution - see normal distribution) is necessarily
white noise, yet neither property implies the other. Gaussianity refers to
the probability distribution with respect to the value i.e. the probability
that the signal has a certain given value, while the term 'white' refers to
the way the signal power is distributed over time or among frequencies."
I do not have the communication toolbox, and the wgn comman...
White Gaussian Noise GenerationHi,
I'm having trouble with the randn function.
I'm trying to generate a white gaussian noise from -10<a<10
with zero mean and variance 1. I did the following:
a=-10:10;
noise=randn(size(a));
However, this doesn't seem to be correct.
The noise that i get when i plot it, doesn't start at -10, it starts
at zero.
How can I shift it so that it goes from -10 to 10?
Another question, when I check the mean and variance of the signal
using the following:
meannoise = mean(noise);
varnoise = var(noise);
The result that I get is not 0 mean and variance 1, why is that? I
thought...
White noise test in matlabHi
I have some real time data collected from a system. I want to do a
white noise test on this data and see this data resembles a white
noise. I now in SAS software Kilmogorov Simrnov test could be used as
white noise test. How do I use the kstest in matlab for checking the
white noise effect.
Thanks
Hi,
You can use the kstest in matlab but you will need the Statistical
Toolbox for that. But I am not sure what you would what CDF you would
use to test your data.
Maybe Peter Perkins, would have some suggestions ??
You test the magnitude values of the septrum of your signal (white
should be...
question about white gaussian noisedoes additive white gaussian noise only change the amplitude of a signal or
does it change both amplitude and phase?
Going from off the top of my head here, so correct me if I am up the
garden path on a frosty morn.
Gaussian noise is continuous frequency spectrum (ie not discrete
frequencies) at random positions in time, thus should not have a
phase.
As far as the amplitude goes, if you multiply noise by 2, its
amplitude becomes larger (doubles). And, if you add it to itself,
with no time delay, then it is the same as multiplying by 2.
However, if you add 2 seperate lots of equivalent am...
Gaussian White NoiseHi everybody, I want to call the "Gaussian White Noise.vi" several times (lets say, in a loop) and thereby, I want to fully control the state of the random generator which is used in the VI. I think, that the "seed" input somehow determines the state of internal random generator (which is unfortunately "hidden" in a DLL). So, what I would like to have is an output parameter that returns the last state of the random generator . The idea is, that I can call the VI several times setting the "seed" input parameter equal to the state of the random generator of the last call. By this, I could get a reproducible stream of random numbers by simply setting the "seed" input parameter of the first call to a user defined value.I hope, I was able to explain my wishes.Thanks for all repliesStefan<a href="http://dict.leo.org/ende?lp=ende&p=thMx..&search=repeat" target="_blank"></a>
Hello, I'm not sure exactly what you are asking, how to do that, or will it work? The how should be a while loop with a shift register. The shift register will store your previous value, feed it into the seed input and will then store the output. It seems a little ironic that you would want a reproduceable set of random numbers, but you are correct in stating that the seed determines the random number. To get the random number generated, that's a little more rough.&...
Feedback white gaussian noiseI'm working on a GUI for PID tuning. My prof told me to add white
gaussian noise with variable mean and variance. But I work with
tranfer functions and I NEED to know the transfer function of the
noise to close the loop and watch controller and filter's action. This
can be easily done with Simulink, but I would have to change radically
my GUI..please tell me there's another way..
TNX
ANTRO
...
Gaussian white noise code in CHello all,
I'm in need of a C program which implements the Gaussian white noise
algorithm in C. The program is to accept a binary file as input and
alter it according to the algorithm.
I'm affraid this project must run on Windoze :(
Thank you in advance
Jess
"Jess" <jessex@kmfms.com> wrote in message
news:63bbea8b.0312070148.4a07e00@posting.google.com...
> Hello all,
>
> I'm in need of a C program which implements the Gaussian white noise
> algorithm in C. The program is to accept a binary file as input and
> alter it according to the algorithm.
...
Adding white gaussian noise to a signalHow do I add white Gaussian noise to a signal without using the awgn function?
For example, i need to add SNR of 5 to a signal x = cos(2*pi*50*t)?
"Chang " <chang14@hotmail.com> wrote in message <gm7gpi$jhn$1@fred.mathworks.com>...
> How do I add white Gaussian noise to a signal without using the awgn function?
> For example, i need to add SNR of 5 to a signal x = cos(2*pi*50*t)?
You can use the randn function. You just need to figure out what variance you need to get the desired SNR (in dB).
/JC
Ok, does this look correct?
sig1 = cos(2*pi*50*t) ;
energyofsig1...
Average power of White Gaussian Noise Hi everyone!
I'm trying to calculate the average power of a White Gaussian Noise
signal (mean 0, variance 1). All the information I have found is
referenced to Power Spectrum Density through "Pwelch" function. Please
Help.
Best regards,
Alejandro
ferminreyes@cantv.net
The answer, my friend, is sitting there in your question.
You don't need Matlab, you need a textbook on elementary spectral
analysis.
Derek
See the thread "Power Spectrum Scaling"
Hope this helps.
Greg
Alejandro wrote:
> Hi everyone!
> I'm trying to calculate the average power of a White Gaussian Noise
> signal (mean 0, variance 1). All the information I have found is
> referenced to Power Spectrum Density through "Pwelch" function.
Please
> Help.
>
> Best regards,
>
> Alejandro
> ferminreyes@cantv.net
The answer, my friend, is sitting in your question.
You need to find a textbook on elementary aspects of spectral analysis.
You don't need Matlab.
Derek
In article <63k60bsdjw31@legacy>, Alejandro <ferminreyes@cantv.net> wrote:
> Hi everyone!
>I'm trying to calculate the average power of a White Gaussian Noise
>signal (mean 0, variance 1). All the information I have found is
>referenced to Power Spectrum Density through "Pwelch" function. Please
>Help.
The Schaum's Outline on signal processing will answer your question.
--scott
--
"C'est un Nagra. C'est ...
white Gaussian noise #2 793278HI
May i Know how to introduce white Gaussian noise into speech signal
using matlab and how can we change the amplitude of the white
Gaussian noise? thanx you
ivan
look at this recent exposee by CSSMer <rune allnor>
<http://groups.google.com/groups?hl=en&lr=lang_en&ie=UTF-8&oe=UTF-8&safe=off&selm=f56893ae.0307040948.aedb1a2%40posting.google.com>
us
Ivan Low:
<SNIP wants to introduce white Gaussian noise into his/her speech
signal...>
...
White Gaussian Noise #2 392198Hi all,
I used y=awgn(x,SNR) function in MATLAB 2007 .
FOR X=100
SNR=-40
Answers are very different. After getting first answer, if I clear command window and type same values again, it gave different value than first answer. Can anyone explain it to me?
"Rupika Bandara" <rupika23@yahoo.com> wrote in message <hrgnsd$b2r$1@fred.mathworks.com>...
> Hi all,
> I used y=awgn(x,SNR) function in MATLAB 2007 .
> FOR X=100
> SNR=-40
> Answers are very different. After getting first answer, if I clear command window and type same values again, it gave di...
Generating non-gaussian white noiseI am trying to generate a 2-d white noise sequence whose first 4
moments (mean, std dev, skewness, kurtosis) are given. In general,
the desired distribution is non-gaussian. One way to do this is to
generate a gaussian sequence and then use a nonlinear transformation.
1. I'm wondering if there're any standard codes that do this.
2. If not, I am having trouble with the translation because matlab's
'randn' does not yield results close enough to gaussian, and for high
high desired kurtosis values , the nonlinear transformation (e.g. a
hyperbolic function) does not yield repeatable results.
Any suggestions ?
ashwin kumar
"Ashwin Kumar" <kumar3@ecn.purdue.edu> wrote in message
news:eec5cff.-1@WebX.raydaftYaTP...
> I am trying to generate a 2-d white noise sequence whose first 4
> moments (mean, std dev, skewness, kurtosis) are given. In general,
> the desired distribution is non-gaussian. One way to do this is to
> generate a gaussian sequence and then use a nonlinear transformation.
>
>
>
>
> 1. I'm wondering if there're any standard codes that do this.
>
>
> 2. If not, I am having trouble with the translation because matlab's
> 'randn' does not yield results close enough to gaussian, and for high
> high desired kurtosis values , the nonlinear transformation (e.g. a
> hyperbolic function) does not yield repeatable results.
>
>
> Any suggest...
Code for White Gaussian Noise GeneratorHi all,
i am stuck up with generating code for white gaussian noise
generator with variable output noise and variable variance.
I designed the code using Monte-Carlo simulation,
x(n+1)=[Bx(n) + u][mod P]
and then generating random variables U1 and U2 such that,
U1=sqrt(-2lnX1) * cos(2pi X2)
U1=sqrt(-2lnX1) * sin(2pi X2)
but U1 and U2 are having variance 1 and i need variable variance...
can anyone please help with this problem !!
thanks, cheers...
"Amar" <pathak_amar@hotmail.com> wrote in message
news:dp1wy1vnh80u@legacy...
> Hi all,
> i am st...
Gaussian White NoiseI was wondering how I could modify the Gaussian White Noise.vi or
create a new one that could output a Gaussian signal that could be
controlled by varying its mean, std, variance, skewness, and kurtosis.
I can change its std but I'm especially having problems trying to
control its variance, skewness, and kurtosis.
Thanks!
I've been working with that VI and I don't believe that it has the
options you are looking for. You may have to built a custom VI to do
this. If you take a look lower down the line of VIs, you will see
that they call a DLL to obtain values. You may need to cal...
gaussian white noise using only integer arithmeticHi Guys,
I need to generate gaussian white noise on an integer DSP.
I have the fast Numerical Recipes generator but it has a log, a sqrt
and divides in it.
Does anyone know where I can find one or where I can read about how to
write one?
Thanks
Dimiter
Dimiter wrote:
> Hi Guys,
>
> I need to generate gaussian white noise on an integer DSP.
>
> I have the fast Numerical Recipes generator but it has a log, a sqrt
> and divides in it.
>
> Does anyone know where I can find one or where I can read about how to
> write one?
This has already been discussed many ti...
how to solve a differential equation with Gaussian white noise?the equation has the following form:
x'' + 0.25x' + 14.8x=g
where g is a contiunous Gaussian white noise?
It is very easy to solve this differential equation using ODE45 if g is a constant or a sin or cos function.
However, in the case g is a contiunous Gaussian white noise, how to deal with this problem?
"Min Gan" <aganmin@yahoo.com.cn> wrote in message <hpfbpg$f1u$1@fred.mathworks.com>...
> the equation has the following form:
> x'' + 0.25x' + 14.8x=g
> where g is a contiunous Gaussian white noise?
> It is very easy to solve this differential equation using ODE45 if g is a constant or a sin or cos function.
> However, in the case g is a contiunous Gaussian white noise, how to deal with this problem?
I do not work with ODEs, but I believe the problem as you've framed it is not solvable. I have difficulty seeing its possible physical relevance as well, but that could just be me.
"Mark Shore" <mshore@magmageosciences.ca> wrote in message <hpfcpa$1f7$1@fred.mathworks.com>...
> "Min Gan" <aganmin@yahoo.com.cn> wrote in message <hpfbpg$f1u$1@fred.mathworks.com>...
> > the equation has the following form:
> > x'' + 0.25x' + 14.8x=g
> > where g is a contiunous Gaussian white noise?
> > It is very easy to solve this differential equation using ODE45 if g is a constant or a sin or cos function.
> > However, in ...
White noise removal using Matlab GUIHello,
I have a final test tomorrow in Matlab where I have to find phrase
hidden in wav file using voise filtering.
Idea of the task:
There are two audio files - one with secret voice message mixed
together with white noise and other with white noise sample.
Noise is used only partialy - for example from 3rd 'pich' and is 100
'pich' long. Then that noise part is added at the end of itself to
make the new noise as long as the voice message and then it is added
to voice message.
Goals are as these:
Design form in witch you can load and show the voice message and white
noise.
...
zero mean white noise generation in matlabi want to generate a zero mean white noise in matlab if u know please
kindly help me
naidu wrote:
>
>
> i want to generate a zero mean white noise in matlab if u know
> please
> kindly help me
to generate N samples of zero-mean white noise use either
rand(N, 1)-0.5
randn(N, 1)
depending on whether the noise should be normally or Gaussian
distributed.
Markus
"Markus Pichler" <m.pichler@icie.jku.at> wrote in message
news:ef2d3fe.0@webx.raydaftYaTP...
> naidu wrote:
>>
>>
>> i want to generate a zero mean white noise in matlab if u know
&...
Does anyone know how to make a rise/fall time on a white noise burst using Uniform White Noise vi?I'm using LV 7, and am trying to create a loud stimulus using the
uniform white noise vi. I have this working fine, but for another
stimulus I would like to have a rise/fall time. Does anyone know how
to do this? I am quite new to Labview...
> for another stimulus I would like to have a rise/fall time.
Do you mean the noise starts out "quiet", gradually gets louder until
it peaks, then gradually gets quieter again?
Just multiply your noise source by your modulation "volume" control.
Les
...
Audio jamming using white noise (Matlab code)Hi
anybdy have any idea how can a baseband audio sound can be supressed or
jammed using a white gaussian noise and how the result can be shown in
Matlab.
any help will be appreciated.
-Shruti
...