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I am trying to get db values from .wav file python using this formula:
dbs = [20 * np.log10(np.sqrt(np.mean(chunk ** 2))) for chunk in chunks]
The issue I am facing is I am getting NaN values in dbs list because of negative values coming from np.mean(chunk**2).
How can I resole this issue?

AlirezaAsadi
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AncientOne
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  • The logarithm of a negative number is undefined, and the `nan` is because of this. you can map negative values of `np.mean(chunk ** 2)` to 1 so its `log10` will be 0. – AlirezaAsadi Jan 04 '22 at 08:00
  • isn't that np.mean(chunk ** 2) return positive? because we are squaring. – AncientOne Jan 04 '22 at 09:50
  • Oh actually you are right, but I was confused with your statement where you say: `The issue I am facing is I am getting NaN values in dbs list because of negative values coming from np.mean(chunk**2).` – AlirezaAsadi Jan 04 '22 at 09:54
  • the Issue is I am getting nan values from formula(dbs) because np.mean(chunk**2) returning negative numbers I am trying to find why it's returning negative values and how to resolve it. – AncientOne Jan 04 '22 at 10:38
  • Check for overflows. Deos this help?: https://stackoverflow.com/a/41774113/8961170 – AlirezaAsadi Jan 04 '22 at 10:46
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    yes. it working now. – AncientOne Jan 06 '22 at 00:23

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