ShazamKitの魔法を解き明かす: 音楽認識技術「オーディオフィンガープリント」の探検！

by Shogo Yoshida

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4IB[BN,JUͷຐ๏Λղ͖໌͔͢ Իָೝٕࣝज़ ʮΦʔσΟΦϑΟϯΨʔϓϦϯτʯͷ ୳ݕʂ

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88%$Ͱ 4IB[BN,JU͕ొ৔ 88%$Ͱ΋ Ξοϓσʔτ͕ൃද

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͜ͷൃදͰ͸ 4IB[BNͷΞϧΰϦζϜΛ ঺հ͠·͢

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4IB[BNʹ͍ͭͯ ݌૽ͷதͰ΋ ָۂΛೝࣝ ʔʔʔ ʔʔʔ ʔʔʔ

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ԻݯΛֶशͤ͞Δ͚ͩͰ͸ʁ

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೾ܗͷϚονϯά͸ϊΠζʹऑ͍ ʴ ʹ શવҧ͏೾ܗ ૽Ի ݩԻݯ Ϛον ͠ͳ͍ ָۂ

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Ͱ͸Ͳ͏͢Δ͔ʁ

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4IB[BNͷΞϧΰϦζϜͷ֓ཁ ೾ܗͷͦͷ··ѻ͏ͷͰ͸ͳ͘ɺप೾਺º࣌ؒͷؔ܎Λ࢖͏ ָۂ υͱϛ͕ඵͷ࣌ؒࠩͰଘࡏ ιͱϥ͕ඵͷ࣌ؒࠩͰଘࡏ ộ प೾਺Λ औΓग़͢ υͱϛ͕ඵͷ࣌ؒࠩͰଘࡏ Ϩͱγ͕ඵͷ࣌ؒࠩͰଘࡏ ộ ʴ ʹ

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प೾਺º࣌ؒΛද͢εϖΫτϩάϥϜʹ͍ͭͯ ௿͍ˡप೾਺ˠߴ͍ ࠷ॳˡ࣌ؒˠ࠷ޙ ڧ͍ ˢ Իͷڧ͞ ˣ ऑ͍ 26&&/ͷ ϘϔϛΞϯϥϓισΟ ΛεϖΫτϩάϥϜʹ

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େ͖͍Ի ࡉ͔͍ϊΠζҎ֎ Λநग़ ࣌ؒ प೾਺

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େ͖͍Ի ࡉ͔͍ϊΠζҎ֎ Λநग़ ࣌ؒ प೾਺ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖

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೚ҙͷ఺Λબ୒ ࣌ؒ प೾਺ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖

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ಛ௃ྔΛ࡞੒ ࣌ؒ प೾਺ ✖ ✖ ࣌ؒɿඵ प೾਺ɿυ ࣌ؒɿඵ प೾਺ɿϛ ඵඵඵ υͱϛ͕ඵͷ࣌ؒࠩͰଘࡏ͢Δ G G ϶U υ ϛ ඵ

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Իݯ͔Βಛ௃ྔΛͨ͘͞Μநग़͢Δ ΦʔσΟΦϑΟϯΨʔϓϦϯτ G G ϶U G G ϶U G G ϶U ộ ۂ" ΦʔσΟΦϑΟϯΨʔϓϦϯτ Իָͷࢦ໲

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Իݯ͔ΒΦʔσΟΦϑΟϯΨʔϓϦϯτΛ࡞੒͠σʔλϕʔεΛߏங G G ϶U G G ϶U ộ ộ G G ϶U G G ϶U ộ ۂ# ۂ" ΦʔσΟΦϑΟϯΨʔϓϦϯτ ΦʔσΟΦϑΟϯΨʔϓϦϯτ σʔλϕʔε

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࿥ԻԻݯ͔ΒΦʔσΟΦϑΟϯΨʔϓϦϯτΛ࡞੒͠%#ͱϚονϯά ࿥ԻԻݯ G G ϶U G G ϶U ộ Ϛονϯά ਖ਼ղָۂ σʔλϕʔε ΦʔσΟΦϑΟϯΨʔϓϦϯτ

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0OFNPSFUIJOH

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ࢦ໲ೝূͷ࢓૊Έ Ҿ༻ϦΧςοΫʛೇϦΧͷ௨৴ٕज़ϥϘ IUUQTTJNQDKQSJLBUFDIBCPVUpOHFSQSJOUBVUIFOUJDBUJPO ଟগͷϊΠζ΋ ૬ରతʹ ແࢹ͞ΕΔ

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ಛ௃ྔಉ࢜ͷ࣌ؒؔ܎Λ༻͍Δ ࣌ؒ प೾਺ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ G G ϶U G G ϶U G G ϶U G G ϶U

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ಛ௃ྔಉ࢜ͷ࣌ؒؔ܎Λ༻͍Δ ࣌ؒ प೾਺ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ✖ ૬ରؔ܎Λ༻͍Δͱ ϊΠζʹڧ͍ ΞϧΰϦζϜʹͳΔ

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·ͱΊ wԻָͷࢦ໲Ͱ͋ΔΦʔσΟΦϑΟϯΨʔϓϦϯτ w೾ܗΛप೾਺º࣌ؒͷ࣍ݩσʔλʹม׵ wͭͷप೾਺ͷ࣌ؒؔ܎Λಛ௃ྔͱͯ͠ɺͦͷू߹ΛΦʔσΟΦϑΟ ϯΨʔϓϦϯτͱͯ͠ར༻ wಛ௃ྔಉ࢜ͷ૬ରతͳ࣌ؒؔ܎Λ༻͍ͯɺϊΠζʹڧ͍ݕग़Λ࣮ݱ Իָೝٕࣝज़ͷ໘ന͞Λ ײ͍͚ͯͨͩͨ͡Βخ͍͠Ͱ͢

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