Scalaで自動作曲の練習 / A study of automatic composition in Scala

Transcript

1. ScalaͰ

   ࣗಈ࡞ۂͷ࿅श
   id:aereal
   

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2. ࠓ೔࿩͢͜ͱɾͶΒ͍
   • ݹయతͳ࡞ۂͷϝιουͷ঺հ
   
   • ͍ΘΏΔʮΫϥγοΫԻָʯͷ࡞Γํ
   
   • ↑ΛScalaͰ࣮૷ͨ͠࿩
   
   • ૉ๿ͳ࣮૷Λఏࣔͯ͠ɺ

   Իָͷߏ଄ɾϧʔϧͷ͓΋͠Ζ͞Λ஌ͬͯ΄͍͠
   

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3. ࠓ೔࿩͞ͳ͍͜ͱ
   • ϙϐϡϥʔԻָɾδϟζͳͲΑΓۙ୅తͳԻָͷख๏
   
   • ટ๏ (Ϟʔυ)ɺແௐ
   
   • ͦͷଞ͍Ζ͍Ζ͋Δख๏ɾϧʔϧ
   
   • ָث๏ (orchestration)
   
   • ͳʹ͔΋ͷ͔͍͍ͬ͘͢͜͝όʔϯͱ΍͍ͬͯΔײ
   

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4. Ϟνϕʔγϣϯ
   • WebɾจࣈྻͬΆ͍ϓϩάϥϛϯά͔Β཭ΕͯΈ͍ͨ
   
   • ͳΜͱͳ͘ػցֶशͱ਌࿨ੑߴͦ͏
   
   • Scalaॻ͖͍ͨ
   
   • ࢥߟΛίʔυʹམͱ͠ࠐΉ࿅श
   

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5. ࣗಈ࡞ۂͷৄ͍͠ࣄྫ
   • ͍Ζ͍Ζ࿦จͱ͔͋Δ
   
   • ౦ژ᥁ज़େֶͷਓͱ͔͕࿦จΛ͍Ζ͍Ζॻ͍͍ͯΔ
   
   • ύοέʔδιϑτ΢ΣΞ΋ച͍ͬͯΔ
   

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6. github.com/aereal/music-study
   

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7. ࡞ۂ?
   • ΋ͷ͘͢͝೉͍͠ͷͰ͸?
   
   • ͍͢͝ਓ͕ײੑΛۦ࢖ͯ͠ર͖ͱڞʹΤΠοͱ΍Δ?
   
   • ࣗಈ࡞ۂͬͯͳΜ͔΋ͷ͍͢͝ϊΠζ·ΈΕͳͷͰ͸?
   

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8. ݹయతͳԻָͷߏ੒ཁૉ
   • ટ཯ (melody)
   
   • ࿨੠ (harmony)
   
   • ཯ಈ (rhythm)
   

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9. ݹయతͳԻָͷߏ੒ཁૉ
   • ͋Δ࣌఺Ͱ໐͍ͬͯΔԻָ = (melody, harmony, rhythm)
   
   • Θ͔͖ͬͯͨ
   

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10. ࿨੠
    • ࿨੠͸໐Βͯ͠Α͍Իͷू߹ΛఆΊΔϧʔϧ
    
    • → ટ཯΋ӨڹΛड͚Δ
    
    • ίΞυϝΠϯͬΆ͍!
    

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11. ࿨੠
    • ໐Βͯ͠Α͍ԻͷϨΠΞ΢τΛܾΊΔϧʔϧ
    
    • ਫฏ: ͋ΔԻͷ࣍ʹ໐ͬͯΑ͍Ի͸?
    
    • ௐ (key), Ի֊ (scale)
    
    • ਨ௚: ͋ΔԻͱಉ࣌ʹ໐ͬͯΑ͍Ի͸?
    
    • = ࿨Ի (chord)
    

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12. ௐ (key) ͱԻ֊ (scale)
    • Ի֊: ԻΛԻߴॱʹฒ΂ͨྻ
    
    • ྫ: υϨϛϑΝιϥγυ
    
    • ௐ: த৺Իͱؔ࿈෇͚
    

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13. ௕Ի֊ (major scale)
    2 2 2 2 2
    1 1
    

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14. ୹Ի֊ (minor scale)
    2 2 2 2
    2
    1 1
    

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15. ͭ·Γ?
    • Ի֊͸ɺج४ͱͳΔԻͱɺԻͷ਺ͱɺ਺ͷൺ͔ΒͳΔ
    
    • →ج४ͱͳΔԻΛ༩͑Ε͹ੜ੒Ͱ͖Δ
    

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16. ࿨Ի
    • ҟͳΔߴ͞ͷԻ͕ಉ࣌ʹ໐͍ͬͯΔঢ়ଶ
    
    • 3ͭͷԻ͔ΒͳΔࡾ࿨Ի (triad) ͕جຊ
    

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17. ௕ࡾ࿨Ի (major triad)
    4
    7
    

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18. ୹ࡾ࿨Ի (minor triad)
    3
    7
    

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19. ͭ·Γ?
    • ࿨Իͷੑ࣭ = ࿨ԻΛߏ੒͢ΔԻͷൺ
    
    • ࠜԻ (root; Ұ൪ԼͷԻ) ͱͷൺͰنఔ͞ΕΔ
    
    • → ࠜԻͱ࿨Իͷੑ࣭Λ༩͑Δͱੜ੒Ͱ͖Δ
    

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20. ػೳ࿨੠
    • ͬ͘͟Γݴ͏ͱɺݱࡏͷঢ়ଶ͔Β࣍ʹͲͷ࿨Իʹਐߦͯ͠
    Α͍͔ఆΊͨϧʔϧू
    
    • ࿨ԻͦΕͧΕʹػೳ͕͋Δͱߟ͑ͯɺ

    ͦͷػೳʹΑͬͯ෼ذ͢Δ
    
    • ྫ: ͜ͷ࿨Ի͸ۓு͢ΔͷͰΑΓϦϥοΫεͰ͖Δ࿨Ի
    ΁
    
    • ίʔυΛݟ·͢
    

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21. σϞ
    

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22. ൓ল
    • ࠷ॳ͔Βಈ͘ͱ͜Ζ͔Β࡞ΔͱΑ͔ͬͨ……
    
    • ෺ཧతͳͱ͜Ζ (प೾਺) ͔Β࡞͍ͬͯͬͨͷΑ͘ͳ͔ͬ
    ͨ
    
    • ਺஋ͷਫ਼౓……
    

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23. ࠓޙͷల๬
    • Web Audioͱ݁߹ͯ͠Ի໐Β͍ͨ͠
    
    • ટ཯ͷੜ੒ → ͠ΐ΅ͯ͘΋͍͍ͳΒ͙͢ʹͰ͖ͦ͏
    

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