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1j01/notes.coffee

Forked from stuartmemo/Note to Frequency
Last active March 3, 2018 03:51
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notes.coffee
notes = ['A', 'A#', 'B', 'C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#']
getFrequency = (noten)->
440 * 2 ** ((noten - 49) / notes.length)
getNoteN = (notestr)->
i = notes.indexOf notestr[0...-1]
octave = parseInt notestr[-1..]
octave -= 1 if i >= notes.indexOf 'C'
octave * notes.length + i + 1
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