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Explain loudness scaling, and clamp to 100

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Eric Rosenbaum 2017-06-23 13:13:30 -04:00
parent 5add85bd60
commit dd0d9556ed
1 changed files with 7 additions and 4 deletions
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11
src/index.js
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@ -321,11 +321,14 @@ class AudioEngine {
}
this._lastValue = rms;
// scale it
// @todo figure out why this magic number is needed and remove it!
// Scale the measurement so it's more sensitive to quieter sounds
rms *= 1.63;
// scale and round the output
return Math.round(Math.sqrt(rms) * 100);
rms = Math.sqrt(rms);
// Scale it up to 0-100 and round
rms = Math.round(rms * 100);
// Prevent it from going above 100
rms = Math.min(rms, 100);
return rms;
}
// if there is no microphone input, return -1