to generate a noise signal

6 次查看（过去 30 天）

显示更早的评论

maulik bhagat 2022-9-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1802980-to-generate-a-noise-signal

评论： Jeffrey Clark 2022-9-13

Read any audio file given and play it from Matlab. Find the

number of samples N in the audio file. Generate a noise signal of length N in which

each sample is from a Gaussian distribution with mean 0 and variance 1. Add the

noise signal in the audio and listen it from Matlab.

Pass the noisy signal generated abouve through a MA filter with M1 = M2 = 2 and

generate the output. Listen the output signal and comment on your observation.

code giving randn error.

[y,Fs] = audioread('hello.mp3');

N = length(y);% Number of sample in y;

variance = 1;

mean=0;

W = sqrt(variance).*randn(1,size(y,1:N))+mean; %Gaussian white noise W

y =y + W; %Add the noise

M1=2;

M2=2;

r = ones(1,M1+M2+1);

impulse_response = (1/M1+M2+1).*r;

for k=-M1:M2

y(k)=.5*y(k) + .5*y(k-1); % taking successive average

end

w = -pi:pi/100:pi;

l=length(y);

k=length(impulse_response);

H=[y,zeros(l+1)];

X=[impulse_response,zeros(k+1)];

for i=1:l+k-1

Y(i)=0;

for j=1:k

if(i-j+1>0)

Y(i)=Y(i)+H(i-j+1)*X(j);

end

sound(Y,Fs);

plot(w,Y)

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Jeffrey Clark 2022-9-13

@maulik bhagat, I think your randn(1,size(y,1:N)) should be randn(size(y)) ?

请先登录，再进行评论。

请先登录，再回答此问题。

回答（0 个）

请先登录，再回答此问题。

类别

Signal Processing Audio Toolbox Code Generation and Deployment

在 Help Center 和 File Exchange 中查找有关 Code Generation and Deployment 的更多信息

产品

MATLAB

版本

R2022a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by