The music gem provides a means on calculating notes and chords.
All examples below assume that
include Music has been called, though you can also use
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:
- Docs: http://rubydoc.info/github/cheerfulstoic/music/frames
- See the examples in the spec files
- Use the term musical term 'interval' or 'semitones' instead of 'distance' in code
- 'C-' can be used to represent C minor
- There can be many versions of chords. See: http://giventowail.com/lessons/evan/the-basics-major-minor-and-power-chords?phpMyAdmin=97715a053dab6cd797cf01c69d7492a4
- Implement calculation of 'cents'
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.