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MIDI to Hz: implementation closer to JUCE #54

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merged 2 commits into from
Sep 4, 2023
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MIDI to Hz: implementation closer to JUCE #54

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63bcdde
midiNoteToFreq: impl closer to JUCE
satelllte Aug 27, 2023
8285f6d
[skip deploy] JUCE reference in comment
satelllte Aug 27, 2023
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6 changes: 4 additions & 2 deletions src/utils/math/midi.ts
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Original file line number Diff line number Diff line change
@@ -1,7 +1,9 @@
/**
* Gets frequency in Hz for corresponding MIDI note.
*
* Same as JUCE's `MidiMessage::getMidiNoteInHertz`:
* https://github.com/juce-framework/JUCE/blob/master/modules/juce_audio_basics/midi/juce_MidiMessage.cpp#L1037-L1040
*/
export function midiNoteToFreq(note: number) {
const a = 440;
return (a / 32) * 2 ** ((note - 9) / 12);
return 440 * 2 ** ((note - 69) / 12);
}