オーディオ波形を表示するために知っておくべきこと

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:VLJ:BTPTIJNB!ZBTP@TBO ΦʔσΟΦ೾ܗΛදࣔ͢ΔͨΊʹ ஌͓ͬͯ͘΂͖͜ͱ J04%$

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࿩͢಺༰ w ΦʔσΟΦͷσʔλܗࣜ w طଘͷΞϓϦͷ೾ܗදࣔ w ೾ܗ༻σʔλ΁ͷม׵ w ύϑΥʔϚϯεͷߟྀ w .FUBMΛ࢖ͬͨ೾ܗඳը

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w ΦʔσΟΦͷ೾ܗ͸ʮϦχΞ1$.ʯͷΦʔσΟΦσʔλΛ΋ͱʹදࣔ͞Εͯ ͍Δ w .1΍""$ͳͲͷѹॖϑΝΠϧ΋ɺϝϞϦ্Ͱѻ͏࣌ʹ͸ʮϦχΞ1$.ʯͷ σʔλʹม׵͞ΕΔ ΦʔσΟΦ೾ܗͱݩσʔλ

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ϦχΞ1$. -JOFBS1VMTF$PEF.PEVMBUJPOʢϦχΞύϧεූ߸มௐʣ ৴߸ͷৼ෯ΛఆظతͳִؒͰαϯϓϦϯάͨ͠σʔλܗࣜ

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w αϯϓϦϯάप೾਺ w ඪຊ஋ͷܕ w νϟϯωϧ਺ͱฒͼॱ ϦχΞ1$. ϑΥʔϚοτ

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Ξφϩά৴߸ ࣌ؒ ৼ෯ ʴ

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Ξφϩά৴߸ ඵ

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αϯϓϦϯά αϯϓϦϯάप೾਺)[ ඵʹ͖ͭՕॴͰαϯϓϦϯά

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σδλϧσʔλ ؒͷ৘ใ͸ൈ͚མͪΔ

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ඪຊ஋ ඪຊ஋ʢαϯϓϧʣ

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ඪຊ஋ ʢ࠷େ஋ʣ ʢ࠷খ஋ʣ fl PBUͷ৔߹

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ඪຊ஋ fl PBUͷ৔߹ σδλϧ্Ͱ͸Λ௒͑ͯ΋େৎ෉ Ξφϩάʹม׵͢Δͱ͖͸ΫϦοϓ͢Δ

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ඪຊ஋ *OUͷ৔߹

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νϟϯωϧ DIεςϨΦ DIαϥ΢ϯυ ʢ࣮ࡍ͸DIʣ DIϞϊϥϧ

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ෳ਺νϟϯωϧͷσʔλͷฒͼ DIͷ৔߹ w /PO*OUFSMFBWFEʢผʑͷόοϑΝʹ෼͔ΕΔʣ w *OUFSMFBWFEʢҰͭͷόοϑΝʣ

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ෳ਺νϟϯωϧͷσʔλͷฒͼ - - - - - - - - ഑ྻ- 3 3 3 3 3 3 3 3 ഑ྻ3 /PO*OUFSMFBWFEʢผʑͷόοϑΝʣ DIͷ৔߹

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ෳ਺νϟϯωϧͷσʔλͷฒͼ - 3 - 3 - 3 - 3 ഑ྻ *OUFSMFBWFEʢͻͱͭͷόοϑΝʣ DIͷ৔߹

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೾ܗදࣔͷྫ %"8ͷ৔߹

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఺Ͱදࣔ ઢͰදࣔ ృΓͭͿ͠ ˞$VCBTFͷྫ

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্Լ͕ࠞࡏ Ξ΢τϥΠϯ ˞$VCBTFͷྫ

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೾ܗදࣔͷྫ ϘΠεϝϞͷ৔߹

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࠷େݶʹ֦େ ࠷େݶʹॖখ ॖখ ˞ϘΠεϝϞͷྫ

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࠷େݶʹ֦େ ॖখ ը໘ͷ෯ʹରͯ͠ ॎઢͷ਺͕Ұॹ ˞ϘΠεϝϞͷྫ

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w ೾ܗʹ伱͕ؒ։͍͍ͯΔ w σʔλ΍6*͕গͳͯ͘ࡁΉ w 3FUJOBͷӨڹΛड͚ͳ͍ w ৼ෯ͷ্Լͷ෯͕ಉ͡ʢ্ԼͰผʑͷσʔλΛ࣋ͨͳͯ͘ྑ͍ʣ

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%"8ͷ৔߹ w ࡉ͔͘ฤूͰ͖ΔͷͰζʔϜͷ෯͕޿͍ w ζʔϜ཰ʹΑͬͯ೾ܗͷඳըͷ࢓ํΛ෼͚͍ͯΔ ϘΠεϝϞͷ৔߹ w େࡶ೺ͳฤू͔͠Ͱ͖ͳ͍ͷͰζʔϜͷ෯͕ڱ͍ w ೾ܗͷඳըͷ࢓ํ͸ͭ

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೾ܗ༻σʔλ΁ͷม׵

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·ͱΊ͍ͨ۠ؒ ͜ͷൣғΛϐΫηϧ෯ͰදࣔͰ͖Ε͹ྑ͍ͱ͢Δ

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࠷େ஋ͱ࠷খ஋Λऔಘ ʢ࠷େ஋ʣ ʢ࠷খ஋ʣ

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ؒҾ͍ͯ͸͍͚ͳ͍ ৼ෯ͳͷͰ෇ۙ͹͔ΓΛ௫Ή͜ͱ͕͋Δ

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ઈର஋ͷ࠷େ஋Λऔಘ ʢઈର஋ͷ࠷େ஋ʣ ʢ࠷খ஋ʣ

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ύϑΥʔϚϯεΛߟྀ͢Δ

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"DDFMFSBUF'SBNFXPSLΛ࢖͏ w fl PBU΍EPVCMFͷ഑ྻʹର͢ΔॲཧΛ଎͘Ͱ͖Δʢ͔΋ʣ w ഑ྻͷத͔Β࠷খ஋ɾ࠷େ஋Λ୳͢὎W%41@NJOWW%41@NBYW

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όοΫάϥ΢ϯυͰॲཧ͢Δ ϝΠϯ εϨου #( εϨου 6*ʹ൓ө ը૾࡞੒ σʔλಡࠐ 6*ߋ৽

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όοΫάϥ΢ϯυͰॲཧ͢Δ ϝΠϯ εϨου #( εϨου 6*ʹ൓ө ը૾࡞੒ σʔλಡࠐ 6*ߋ৽ "VEJPऔࠐ ζʔϜ Ωϟογϡ

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࠷খݶͷ6*Λදࣔ͢Δ ϘΠεϝϞతͳ৔߹ ը໘ ࠶ར༻

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.FUBMΛ࢖͏

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.FUBMΛ࢖͏΂͖ͱ͖͸ʁ w 6*,JUͰ͸ύϑΥʔϚϯε͕ग़ͳ͍ʢը૾ͷඳըʹ͕͔͔࣌ؒΔʣ w ઈ͑ؒͳ͘εϜʔζͳΞχϝʔγϣϯΛ͍ͨ͠ w සൟʹ೾ܗͷߋ৽Λ͢Δ

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.FUBMͰ೾ܗΛඳը w ը૾Λඳը͢ΔͷͰ͸ͳ͘ɺϙϦΰϯͰඳը͢Δ w ృΓͭͿ͠͸ࡾ֯ܗΛ૊Έ߹ΘͤΔ w ௖఺࠲ඪͷ഑ྻΛ$16ଆͰ࡞ΓɺృΓͭͿ͠͸(16ʹ೚ͤΔ w ࣄલʹը૾Λ࡞Δඞཁ͕ͳ͘ͳΔ

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σʔλྔ͕গͳ͘͢Ή ը૾ ௖఺഑ྻ ॎͷσʔλྔ͕ গͳ͘ͳΔ

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࣍ݩը૾ͷඳը͕ճͰ͢Ή ೾ܗը૾࡞੒ ը໘දࣔ ೾ܗ༻σʔλ ࡞੒ ը໘දࣔ ೾ܗ༻σʔλ ࡞੒ ͍Βͳ͘ͳΔ

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֊ஈঢ়ʹృΓͭͿ͠

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֊ஈঢ়ʹృΓͭͿ͠ ௖఺Λฒ΂Δ

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֊ஈঢ়ʹృΓͭͿ͠ ࡾ֯ܗΛ૊Έ߹ΘͤͯృΓͭͿ͢

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ઢܗิؒతʹృΓͭͿ͠ ҰݟΞφϩάͷ೾ܗʹۙ͘ݟ͑Δ͕ σδλϧσʔλͷࢹ֮Խͱͯ͠͸ӕ Ͱ΋௖఺͸গͳ͘ࡁΉ

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ྠֲઢ ઢͷଠ͞͸ௐ੔Ͱ͖ͳ͍

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ྠֲઢ ࡾ֯ܗΛ૊Έ߹ΘͤΔ

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όοΫάϥ΢ϯυͰॲཧ͢Δ ϝΠϯ εϨου ඳը ඳը ඳը ඵ ඵ

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όοΫάϥ΢ϯυͰॲཧ͢Δ ϝΠϯ εϨου #( εϨου ඳը ௖఺഑ྻ࡞੒ .5-#V ff FSʹ ൓ө σʔλಡࠐ ඳը ඳը

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όοΫάϥ΢ϯυͰॲཧ͢Δ ϝΠϯ εϨου #( εϨου ඳը ௖఺഑ྻ࡞੒ σʔλಡࠐ ඳը ˞͜͜΋#(ʹͰ͖Δ͔΋ʁ .5-#V ff FSʹ ൓ө ඳը .5-#V ff FSʹ ൓ө

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೾ܗΛදࣔ͢Δͱ͜Ζ ଞͷ6* ը໘ ͚ͩ͜͜.FUBM7JFXʹͯ͠ .FUBMͷෛՙΛܰ͘͢Δ .FUBM7JFXΛ࠷௿ݶͷྖҬʹ͢Δ

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ͦͷଞͷ.FUBMͷར఺ w ζʔϜͯ͠΋ඳը࣌ͷղ૾౓͸Լ͕Βͳ͍ w ෳ਺ͷ೾ܗϒϩοΫΛ૊Έ߹Θͤͯ΋ܨ͗໨͕͖Ε͍ w ϑϨʔϜϨʔτΛམͱ͢͜ͱ͕Ͱ͖Δ

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·ͱΊ

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࿩ͨ͠಺༰ w ΦʔσΟΦͷσʔλܗࣜʹ͍ͭͯʢϦχΞ1$.ʣ w طଘͷΞϓϦͷ೾ܗදࣔʢ$VCBTFɾϘΠεϝϞͷྫʣ w ೾ܗ༻σʔλ΁ͷม׵ʢ࠷େ஋ɾ࠷খ஋Λ࢖͏ʣ w ύϑΥʔϚϯεͷߟྀʢ"DDFMFSBUF'8ɾ#(ʹ೚ͤΔɺ࠷௿ݶͷ6*ʣ w .FUBMΛ࢖ͬͨ೾ܗඳըʢ௖఺഑ྻͰܰ͘͢Δʣ