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/ noteFrequency.js
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October 27, 2022 03:05
Get the wavelength of a note in the Chromatic scale
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| function noteFrequency(offset) { | |
| // A4 has a defined, integer frequency. Let's use this as the base for calculations | |
| const A4Frequency = 440; | |
| // Allows: | |
| // - multiple flats and sharps in any order | |
| // - usage of '♭' or lowercase 'B' as flat | |
| const noteRegExp = /^([a-gA-G])([♭b♯#]*)(-?\d+)?$/; | |
| const semitoneMultiplier = 2 ** (1/12); | |
| const scaleNoteCount = 12; | |
| // Pre calculate offsets of each note from A |
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