How to input noise during the audio transmission process ?

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Sisi Misi
Sisi Misi 2021-9-21
评论： Sisi Misi 2021-10-5
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
Mathieu NOE 2021-9-21
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
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)

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