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Scalaで自動作曲の練習 / A study of automatic composition in Scala
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aereal
September 14, 2017
Programming
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Scalaで自動作曲の練習 / A study of automatic composition in Scala
aereal
September 14, 2017
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Transcript
ScalaͰ ࣗಈ࡞ۂͷ࿅श id:aereal
ࠓ͢͜ͱɾͶΒ͍ • ݹయతͳ࡞ۂͷϝιουͷհ • ͍ΘΏΔʮΫϥγοΫԻָʯͷ࡞Γํ • ↑ΛScalaͰ࣮ͨ͠ • ૉͳ࣮Λఏࣔͯ͠ɺ Իָͷߏɾϧʔϧͷ͓͠Ζ͞Λͬͯ΄͍͠
ࠓ͞ͳ͍͜ͱ • ϙϐϡϥʔԻָɾδϟζͳͲΑΓۙతͳԻָͷख๏ • ટ๏ (Ϟʔυ)ɺແௐ • ͦͷଞ͍Ζ͍Ζ͋Δख๏ɾϧʔϧ • ָث๏
(orchestration) • ͳʹ͔ͷ͔͍͍ͬ͘͢͜͝όʔϯͱ͍ͬͯΔײ
Ϟνϕʔγϣϯ • WebɾจࣈྻͬΆ͍ϓϩάϥϛϯά͔ΒΕͯΈ͍ͨ • ͳΜͱͳ͘ػցֶशͱੑߴͦ͏ • Scalaॻ͖͍ͨ • ࢥߟΛίʔυʹམͱ͠ࠐΉ࿅श
ࣗಈ࡞ۂͷৄ͍͠ࣄྫ • ͍Ζ͍Ζจͱ͔͋Δ • ౦ژज़େֶͷਓͱ͔͕จΛ͍Ζ͍Ζॻ͍͍ͯΔ • ύοέʔδιϑτΣΞച͍ͬͯΔ
github.com/aereal/music-study
࡞ۂ? • ͷ͍͘͢͝͠ͷͰ? • ͍͢͝ਓ͕ײੑΛۦͯ͠ર͖ͱڞʹΤΠοͱΔ? • ࣗಈ࡞ۂͬͯͳΜ͔ͷ͍͢͝ϊΠζ·ΈΕͳͷͰ?
ݹయతͳԻָͷߏཁૉ • ટ (melody) • (harmony) • ಈ (rhythm)
ݹయతͳԻָͷߏཁૉ • ͋Δ࣌Ͱ໐͍ͬͯΔԻָ = (melody, harmony, rhythm) • Θ͔͖ͬͯͨ
• ໐Βͯ͠Α͍Իͷू߹ΛఆΊΔϧʔϧ • → ટӨڹΛड͚Δ • ίΞυϝΠϯͬΆ͍!
• ໐Βͯ͠Α͍ԻͷϨΠΞτΛܾΊΔϧʔϧ • ਫฏ: ͋ΔԻͷ࣍ʹ໐ͬͯΑ͍Ի? • ௐ (key), Ի֊
(scale) • ਨ: ͋ΔԻͱಉ࣌ʹ໐ͬͯΑ͍Ի? • = Ի (chord)
ௐ (key) ͱԻ֊ (scale) • Ի֊: ԻΛԻߴॱʹฒͨྻ • ྫ: υϨϛϑΝιϥγυ
• ௐ: த৺Իͱؔ࿈͚
Ի֊ (major scale) 2 2 2 2 2 1 1
Ի֊ (minor scale) 2 2 2 2 2 1 1
ͭ·Γ? • Ի֊ɺج४ͱͳΔԻͱɺԻͷͱɺͷൺ͔ΒͳΔ • →ج४ͱͳΔԻΛ༩͑ΕੜͰ͖Δ
Ի • ҟͳΔߴ͞ͷԻ͕ಉ࣌ʹ໐͍ͬͯΔঢ়ଶ • 3ͭͷԻ͔ΒͳΔࡾԻ (triad) ͕جຊ
ࡾԻ (major triad) 4 7
ࡾԻ (minor triad) 3 7
ͭ·Γ? • Իͷੑ࣭ = ԻΛߏ͢ΔԻͷൺ • ࠜԻ (root; Ұ൪ԼͷԻ) ͱͷൺͰنఔ͞ΕΔ
• → ࠜԻͱԻͷੑ࣭Λ༩͑ΔͱੜͰ͖Δ
ػೳ • ͬ͘͟Γݴ͏ͱɺݱࡏͷঢ়ଶ͔Β࣍ʹͲͷԻʹਐߦͯ͠ Α͍͔ఆΊͨϧʔϧू • ԻͦΕͧΕʹػೳ͕͋Δͱߟ͑ͯɺ ͦͷػೳʹΑͬͯذ͢Δ • ྫ: ͜ͷԻۓு͢ΔͷͰΑΓϦϥοΫεͰ͖ΔԻ
• ίʔυΛݟ·͢
σϞ
ল • ࠷ॳ͔Βಈ͘ͱ͜Ζ͔Β࡞ΔͱΑ͔ͬͨ…… • ཧతͳͱ͜Ζ (प) ͔Β࡞͍ͬͯͬͨͷΑ͘ͳ͔ͬ ͨ • ͷਫ਼……
ࠓޙͷల • Web Audioͱ݁߹ͯ͠Ի໐Β͍ͨ͠ • ટͷੜ → ͠ΐ΅͍͍ͯ͘ͳΒ͙͢ʹͰ͖ͦ͏