The music gem provides a means on calculating notes and chords.
note = Note.new(698.46) # Creates a note object with the frequency 698.46 note = Note.new('F#6') # Creates an F sharp note in the 6th octave
Note.new(698.46) < Note.new(1975.53) # => true Note.new(698.46) == Note.new('F5') # => true
Converting from frequency to note string and vice versa:
Note.new(698.46).note_string # => 'F5' Note.new('Bb3').frequency # => 233.08
Find how many semitones two notes are apart:
Note.note_distance('A4', 'A#4') # => 1 Note.note_distance('B1', 'F1') # => -6 Note.note_distance('G#1', 'Ab1') # => 0
Adjust frequencies by semitones:
Note.frequency_adjustment(440.0, 15) # => 1046.50
chord = Chord.new(['C4', 'E4', 'G4']) # Create a C major chord
Chord.new(['C4', 'Eb4', 'Gb4']) # => ['C', :diminished]
For further usage, see the examples in the spec files
Contributing to music
Contributions are welcome. Check out the issues list and feel free to fork and make a pull request if you have any fixes/additions.
Copyright (c) 2012 Brian Underwood. See LICENSE.txt for further details.