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

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suganya saravanan 2015-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/181780-how-can-i-add-noise-in-particular-place-of-the-sine-wave

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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Answer 1

Rick Rosson 2015-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/181780-how-can-i-add-noise-in-particular-place-of-the-sine-wave#answer_170281

编辑：Rick Rosson 2015-3-6

在 MATLAB Online 中打开

   noise = [ zeros(N,1) ; rand(M,1) ];
   distorted = source + noise;

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suganya saravanan 2015-3-6

在 MATLAB Online 中打开

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.