designing noise generator by using matlab

[hitman1988]

hi all

i wanna design a noise generator by using matlab , but not by sumlink method . i wanna design i by using programing method not the blocks
can you help me with that? please

 

[hitman1988]

hiiii
please help me , the problem is how to calculate the mean and the variance of this system in matlab the code as following
x = 1000;
y = 1000;
h = wgn(x,y,10);
plot(h)

 

[bigdogguru]

Your code:

x = 1000;
y = 1000;
h = wgn(x,y,10);

Generates a 1000x1000 matrix of white gaussian noise in decibels, is that what you want?

If you are after adding a noise signal to signal or collection of data, you can use some like:

t = 0:.001:.25;
x = sin(2*pi*60*t); //60 Hz Sine Wave

y = x + 2*randn(size(t)); //Add random noise


plot(y(1:50))
title('Noisy time domain signal'); //Plot it


s = std; //Standard Deviation

v = var; //Variance

m = mean; //Mean

 

[philoman]

i hope this will help, try "help awgn", which will calculate the signal power and add the desired amount of noise automatically.

 

[Aya2002]

i hope this will help, try "help awgn", which will calculate the signal power and add the desired amount of noise automatically.

In his question is how to create a noise function such as the awgn not to use the already created by mathwork