How to input noise during the audio transmission process ?

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Sisi Misi 2021-9-21

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https://ww2.mathworks.cn/matlabcentral/answers/1457619-how-to-input-noise-during-the-audio-transmission-process

评论： Sisi Misi 2021-10-5

采纳的回答： Mathieu NOE

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Hello everyone

I do audio compression with bit per sample variations like this:

[y,Fs]=audioread('water.wav');
audiowrite('testing.flac',y,Fs,'BitsPerSample', 8);

Now I also want to input noise into the process

Does anyone know how the code should be used?

thank you

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Mathieu NOE 2021-9-21

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hello

if you simply want to add some white noise you can do this

[y,Fs]=audioread('water.wav');
 y = y + 0.1*randn(size(y)); % adjust amplitude to your needs
 y = y./max(abs(y)); % normalize data to avoid saturation (may be depend on output format)
audiowrite('testing.flac',y,Fs,'BitsPerSample', 8);

you can also add a low or high or bandpass filter on the random noise if you want to have noise in a certain frequency range.

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Mathieu NOE 2021-10-1

hello

so far the code will add the noise to the original audio , not the compressed audio

the compression is done after the noise is added (y = y + 0.01*randn(size(y));) , because as explained above , the compression is done inside audiowrtite when you select a certain type of format (wav and flac are both compressed audio formats)

Sisi Misi 2021-10-5