librosa does not normalize wave file between [-1, 1]

[Good Robot]

In passing a file via the use:

       librosa_audio, librosa_sample_rate = librosa.load(filename)

The output produces an audio file such that:

Librosa audio file min~max range: -1.2105224 to 1.2942806

The file that I am working on was obtained from https://www.boomlibrary.com/ and had a bit depth of 24. I down sampled to 16 and also up sampled to 32 to work with librosa. Both of these files produced the same min-max range after going through librosa.

Why does this happen?
Is there a way to parse the wav file to Librosa such that the data will fall between [-1,1]?

[Brian McFee]

If you want to normalize the audio, you can use librosa.util.normalize.  By default, this will do peak normalization, which should do what you want.

Per your second question: changing bit depth does not necessarily change the normalization of a wav file.  It can, if your sample values are near the limits of the integer range in question, but it sounds like that's not the case for your particular example.

[Good Robot]

Thank you for your response!

Sincerely appreciated!

On Mon, Dec 7, 2020 at 9:36 AM Brian McFee <brian...@nyu.edu> wrote:

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