optimize volume normalization #104
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fix a logical bug, missing parentheses
CorentinJ
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Aug 30, 2019
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Optimized volume normalization (CorentinJ#104)
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fix a logical bug, missing parentheses.
Optimization:
20 * log10(sqrt(np.mean((wav * max_possible_amplitude)^2)) / max_possible_amplitude)
= 20 * log10(sqrt(max_possible_amplitude^2 * np.mean(wav^2)) / max_possible_amplitude)
= 20 * log10(max_possible_amplitude * sqrt(np.mean(wav^2)) / max_possible_amplitude)
= 20 * log10(sqrt(np.mean(wav^2)))
= 10 * log10(np.mean(wav^2))