how can i add a gaussian noise with amp. 0.1 to a sin wav signal ??

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amira ramadan 2014-4-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/127412-how-can-i-add-a-gaussian-noise-with-amp-0-1-to-a-sin-wav-signal

评论： amira ramadan 2014-4-28

采纳的回答： Image Analyst

not with the fun. awgn because it's undefined function on the version of matlab i have .

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dpb 2014-4-27

在 MATLAB Online 中打开

What does the amplitude 0.1 refer to?

doc randn

amira ramadan 2014-4-27

In this problem, we want to study the effect of an averaging filter (averaging window) on eliminating the noise on a signal. Use MATLAB to generate a 10 periods of a discrete sin wave signal with amplitude=1 and period = 50 samples. Then add Gaussian noise to it with amplitude 0.1. Pass the noisy signal on an averaging filter of variable length. PLOT the original signal, the noisy signal, and the filtered one. What is the effect of the filter’s length? What happens if the filter’s length becomes too small or too large?

that,s the problem required !?

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Answer 1

Image Analyst 2014-4-27

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/127412-how-can-i-add-a-gaussian-noise-with-amp-0-1-to-a-sin-wav-signal#answer_134801

在 MATLAB Online 中打开

t = 1 : 300;
y = sin(t) + 0.1 * randn(1, length(t))

Otherwise, if you have the Image Processing Toolbox, how about using imnoise()? That is, if you didn't want randn (the preferred method) for some reason.