Problems using the function audiowrite

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ignacio 2015-11-13

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https://ww2.mathworks.cn/matlabcentral/answers/254631-problems-using-the-function-audiowrite

评论： ignacio 2015-11-20

Hello, I'm working with Matlab R2014b and trying to create a wav file. I tried two posibilities:

 - wavwrite(int32(signal),Fs,24,['test2.wav'])  
 - audiowrite(['test.wav'],int32(signal),Fs,'BitsPerSample',24)

But when I try to heard both files, I can only heard the first one created with the old function wavwrite.

In both case is the same signal.

any help?

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Answer 1

Nick Haddad 2015-11-13

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https://ww2.mathworks.cn/matlabcentral/answers/254631-problems-using-the-function-audiowrite#answer_199698

在 MATLAB Online 中打开

There is one subtle difference between writing 24-bit audio with audiowrite vs. wavwrite.

When writing int32 as 24-bit audio in wavwrite, the data range in y is interpreted as:

–2^23 ≤ y ≤ 2^23–1

When writing an int32 as 24-bit audio in audiowrite, the data range in y is interpreted as:

-2^32 ≤ y ≤ 2^32–1

So your data is still being written but slightly quieter. If your 'signal' variable is in the 24-bit range you will need to rescale it to the 32-bit range to get the same results as using wavwrite. If 'signal' is just a normalized double (-1 ≤ y ≤ 1), the you can simply supply the double value and audiowrite will scale it for you properly:

audiowrite(['test.wav'],signal,Fs,'BitsPerSample',24)