How could add noise to a music file in a way that after a certain amount of time the music file become noise free?

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Brandon Sarrasin
Brandon Sarrasin 2020-3-15
评论： Image Analyst 2020-3-15
multiplier = 0.1;
noise = randn(length(y),1).*multiplier;
sound_w_noise = y+noise;
sound(sound_w_noise,Fs);
As of now, the noise lasts the entire music file. So far I have tried creating different arrays with different lengths then using that to create the noise, like here.
ys = y(1:57344);
multiplier = 0.1;
noise = randn(length(ys),1).*multiplier;
sound_w_noise = ys+noise;
sound(sound_w_noise,Fs);
But all that has done is cut short the music file itself. What could I do so that the noise only lasts for a certain amount of time of the total music file?

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回答（1 个）

Thiago Henrique Gomes Lobato
You were almost there. The array you have to shorten is the noise one, while, at the same time, adding it only at the initial values of your sound:
LenNoise = 57344;
multiplier = 0.1;
noise = randn(LenNoise,1).*multiplier;
sound_w_noise = y;
sound_w_noise(1:LenNoise) = sound_w_noise(1:LenNoise)+noise;
sound(sound_w_noise,Fs);

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