how to produce a signal distorted with noise?

use using randn commmand?

Answer 1

[David Young]

It depends on what characteristics you want the noise to have. If you want noise from a normal distribution with the samples independent, then yes, randn is the right function. For example, if the noise is to be additive:

   N = 500;
   signal = sin((1:N) * 0.05);  
   noiseLevel = 0.1;
   noise = noiseLevel * randn(1, N);
   noisySignal = signal + noise;
   plot(noisySignal);

[ap singh]

i made something like this

clc

close all

clear all

f=input('enter the 1 set of frequency=')

t=rand(1,28);

for i=1:8

t=linspace(0,1,2000);

x(1,:)=sin(2*pi*f(i)*t);

y=t+x;

end

y=reshape(x',1,length(x));

sound(x,8000)

wavwrite(y,8000,'apsondnoise.wav')

is it right??