Module: RBMusic

Defined in:

lib/rb-music/note.rb,
lib/rb-music/scale.rb,
lib/rb-music/version.rb,
lib/rb-music/interval.rb,
lib/rb-music/note_set.rb,
lib/rb-music/constants.rb

Defined Under Namespace

Classes: Interval, Note, NoteSet, Scale

Constant Summary

VERSION =

"0.0.6"

Error =

Class.new(StandardError)

ArgumentError =

Class.new(ArgumentError)

NOTE_NAMES =

["F", "C", "G", "D", "A", "E", "B"]

ACCIDENTALS =

["bb", "b", "", "#", "x"]

NOTES =

notes - two dimensional [octave, fifth] - relative to the ‘main’ note

{
  "Fbb" => [10, -17],
  "Cbb" => [10, -16],
  "Gbb" => [9, -15],
  "Dbb" => [8, -14],
  "Abb" => [8, -13],
  "Ebb" => [7, -12],
  "Bbb" => [7, -11],

  "Fb" => [6, -10],
  "Cb" => [5, -9],
  "Gb" => [5, -8],
  "Db" => [4, -7],
  "Ab" => [4, -6],
  "Eb" => [3, -5],
  "Bb" => [3, -4],

  "F" => [2, -3],
  "C" => [1, -2],
  "G" => [1, -1],
  "D" => [0, 0],
  "A" => [0, 1],
  "E" => [-1, 2],
  "B" => [-1, 3],

  "F#" => [-2, 4],
  "C#" => [-3, 5],
  "G#" => [-3, 6],
  "D#" => [-4, 7],
  "A#" => [-4, 8],
  "E#" => [-5, 9],
  "B#" => [-5, 10],

  "Fx" => [-6, 11],
  "Cx" => [-7, 12],
  "Gx" => [-7, 13],
  "Dx" => [-8, 14],
  "Ax" => [-8, 15],
  "Ex" => [-9, 16],
  "Bx" => [-10, 17]
}

BASE_FREQ =

A4 ‘main’ note

440

BASE_OFFSET =

offset of base note from D0

[4, 1]

INTERVALS =

intervals - two dimensional [octave, fifth] - relative to the ‘main’ note

{
  unison:           [0, 0],
  minor_second:     [3, -5],
  major_second:     [-1, 2],
  minor_third:      [2, -3],
  major_third:      [-2, 4],
  fourth:           [1, -1],
  augmented_fourth: [-3, 6],
  tritone:          [-3, 6],
  diminished_fifth: [4, -6],
  fifth:            [0, 1],
  minor_sixth:      [3, -4],
  major_sixth:      [-1, 3],
  minor_seventh:    [2, -2],
  major_seventh:    [-2, 5],
  octave:           [1, 0]
}

INTERVALS_SEMITONES =

{
  0 =>  [0, 0],
  1 =>  [3, -5],
  2 =>  [-1, 2],
  3 =>  [2, -3],
  4 =>  [-2, 4],
  5 =>  [1, -1],
  6 =>  [-3, 6],
  7 =>  [0, 1],
  8 =>  [3, -4],
  9 =>  [-1, 3],
  10 => [2, -2],
  11 => [-2, 5],
  12 => [1, 0]
}

SCALES =

{
  major: [:major_second, :major_third, :fourth, :fifth, :major_sixth, :major_seventh],
  natural_minor: [:major_second, :minor_third, :fourth, :fifth, :minor_sixth, :minor_seventh],
  harmonic_minor: [:major_second, :minor_third, :fourth, :fifth, :minor_sixth, :major_seventh],
  major_pentatonic: [:major_second, :major_third, :fifth, :major_sixth],
  minor_pentatonic: [:minor_third, :fourth, :fifth, :minor_seventh],
  blues: [:minor_third, :fourth, :augmented_fourth, :fifth, :minor_seventh],
  dorian: [:major_second, :minor_third, :fourth, :fifth, :major_sixth, :minor_seventh],
  phrygian: [:minor_second, :minor_third, :fourth, :fifth, :major_sixth, :minor_seventh],
  lydian: [:major_second, :major_third, :augmented_fourth, :fifth, :major_sixth, :major_seventh],
  mixolydian: [:major_second, :major_third, :fourth, :fifth, :major_sixth, :minor_seventh],
  locrian: [:minor_second, :minor_third, :fourth, :diminished_fifth, :minor_sixth, :minor_seventh],
}