how can i add noise in particular place of the sine wave?

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suganya saravanan
编辑： Zikobrelli 2015-3-6
i want to add noise in the middle of the sine wave. but if i use the rand() function it adds noise to the total signal.how to add noise in some parts of the signal only.kindly help me.......

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Rick Rosson
Rick Rosson 2015-3-6
编辑：Rick Rosson 2015-3-6
noise = [ zeros(N,1) ; rand(M,1) ];
distorted = source + noise;
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suganya saravanan
suganya saravanan 2015-3-6
thank you for your answer. but it shows me error.its saying matrix dimension must agree. i attached you my coding along this. kindly help me in getting output.
if true
% clc;
clear all;
close all;
noiseAmplitude=2;
t=[0:0.1:10];
freq=1500;
samplefreq=2500;
source= sin(2*pi*(freq/samplefreq)*t);
figure(1);
plot(source);
grid on;
hold on;
noise = [ zeros(N,1) ; rand(M,1) ];
distorted = source + noise;
figure(2);
plot(distorted);code
end
if i add rand() then noise is added to full signal. i need in particular places only. kindly help me.
Zikobrelli
Zikobrelli 2015-3-6
编辑：Zikobrelli 2015-3-6
you need to specify the values of M and N. For example, if you want to add noise to the first 10 points of your signal you can use,
N=10
M=numel(t)
changing the values of M and N will enable you to choose the signal indexes where the noise is applied

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