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RubyͰԻΛ࡞Δ දࢀಓ.rb ta1kt0me

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ࣗݾ঺հ • ΤϯδχΞ@גࣜձࣾgrooves • Twitter • @talkto_me • Github • @ta1kt0me

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ԻΛ࡞Δ

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ϥΠϒϥϦ • ruby-coreaudio • Core Audioͱ͍͏iOSɺOSX༻ͷԻָϥΠ ϒϥϦͷϥούʔ • https://github.com/nagachika/ruby- coreaudio

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αϯϓϧ ˌruby-coreaudio/examples/outbuffer_sine.rb require "coreaudio" dev = CoreAudio.default_output_device buf = dev.output_buffer(1024) phase = Math::PI * 2.0 * 440.0 / dev.nominal_rate th = Thread.start do i = 0 wav = NArray.sint(1024) loop do 1024.times {|j| wav[j] = (0.4 * Math.sin(phase*(i+j)) * 0x7FFF).round } i += 1024 buf << wav end end buf.start sleep 2 buf.stop puts "#{buf.dropped_frame} frame dropped." th.kill.join

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΍ͬͯΔ͜ͱ • ഑ྻʹ਺ࣈΛ٧ΊΔ • ग़ྗσόΠεʹ౉͢

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Θ͔Βͳ͍ • 440.0 ❓ • Math::PI * 2 ❓ • 0x7FFF ❓ • 0.4 ❓ • Math.sin ❓

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(θωθ;?

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ͱΓ͋͑ͣ • प೾਺ • Իͷߴ͕ܾ͞·Δ • ج४͸440Hz ϥ • Ϗοτਂ౓ • Իͷେ͖͕ܾ͞·Δ • αϯϓϦϯάϨʔτͱ࠶ੜ࣌ؒ • ੜ੒͢Δ਺஋ͷ਺͕ܾ·Δ • αΠϯ೾ • ౳଎ԁӡಈͰදݱ

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αΠϯ೾ • ౳଎ԁӡಈ STANDARD_PITCH = 440.0 BIT_DEPTH = 0x05A0 PLAY_TIME = 2 tone = 3 waves = [] dev = CoreAudio.default_output_device phase = STANDARD_PITCH * 2 ** (tone/12.0) / dev.nominal_rate (0...PLAY_TIME * dev.nominal_rate).inject(0.0) do |position, i| waves << Math.sin(position * 2 * Math::PI) * BIT_DEPTH phase * i - (phase * i).floor end

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ෳ਺ͷԻ࠶ੜ͍ͨ͠ • ෳ਺ͷchannel͔ΒͷԻΛಉ࣌ʹ࠶ੜ͢Δ • ෳ਺ͷԻΛಉ࣌ʹ࠶ੜ͢Δ • ԻΛ߹੒ͯ͠ҰͭͷchannelͰ࠶ੜ͢Δ

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Իͷ߹੒ • ෳ਺ͷप೾਺ͷαΠϯ೾Λ߹੒͢Δ͢Δͱɺ ෳ਺ͷԻ͕ͳ͍ͬͯΔΑ͏ʹฉ͑͜Δ • 523Hzʢυʣ + 659Hzʢϛʣ + 784Hzʢιʣ • प೾਺͸େମ

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ଞͷ೾ܗ

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ϊίΪϦ೾ • ΪβΪβͳ೾ STANDARD_PITCH = 440.0 BIT_DEPTH = 0x05A0 PLAY_TIME = 2 tone = 3 waves = [] dev = CoreAudio.default_output_device phase = STANDARD_PITCH * 2 ** (tone/12.0) / dev.nominal_rate (0...PLAY_TIME * dev.nominal_rate).inject(0.0) do |position, i| waves << ((position * 2.0) - 1.0) * BIT_DEPTH phase * i - (phase * i).floor end

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ࡾ֯೾ STANDARD_PITCH = 440.0 BIT_DEPTH = 0x05A0 PLAY_TIME = 2 tone = 3 waves = [] dev = CoreAudio.default_output_device phase = STANDARD_PITCH * 2 ** (tone/12.0) / dev.nominal_rate (0...PLAY_TIME * dev.nominal_rate).inject(0.0) do |position, i| waves << BIT_DEPTH - (((position * 2.0) - 1.0) * BIT_DEPTH * 2.0).abs phase * i - (phase * i).floor end

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ۣܗ೾ • ࠷େ͔࠷খ͔ STANDARD_PITCH = 440.0 BIT_DEPTH = 0x05A0 PLAY_TIME = 2 tone = 3 waves = [] dev = CoreAudio.default_output_device phase = STANDARD_PITCH * 2 ** (tone/12.0) / dev.nominal_rate (0...PLAY_TIME * dev.nominal_rate).inject(0.0) do |position, i| waves << ((position >= 0.5) ? BIT_DEPTH : -BIT_DEPTH) phase * i - (phase * i).floor end

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ϊΠζ • βʔοͯԻ • ϗϫΠτϊΠζʹ෼ྨ͞ΕΔʁ • ࣜ rand(-Ϗοτਂ౓..Ϗοτਂ౓)

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·ͱΊ • RubyͰԻ͕࡞ΕΔ • ΋ͬͱָʹ࡞ΕΔϥΠϒϥϦ͍Ζ͍Ζ͋Γͦ͏ • Իͷߏ଄͕ΠϝʔδͰ͖ͨ • Ի࡞Δ࣌ɺ೾ܗݟͳ͕ΒͩͱḿΔ • ϑʔϦΤ΄ʹΌΒΒ͕೉ղ • ΧϥʔυϊΠζ΁ͷಓͷΓ͸௕͍

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͋Γ͕ͱ͏͍͟͝·ͨ͠