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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?

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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. Commented Jan 4, 2022 at 8:00
  • isn't that np.mean(chunk ** 2) return positive? because we are squaring. Commented Jan 4, 2022 at 9:50
  • 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). Commented Jan 4, 2022 at 9:54
  • 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. Commented Jan 4, 2022 at 10:38
  • 1
    yes. it working now. Commented Jan 6, 2022 at 0:23
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