{"id":"spectrogram","no":386,"name":"Spectrogram","ja":"スペクトログラム","era":"1940s–","family":"図解表現","kind":"技法","collection":"Dictionary expansion 21","addedAt":"2026-08-18","source":{"title":"Cornell Lab — Macaulay Library","url":"https://www.macaulaylibrary.org/"},"reference":{"status":"verified","pageUrl":"https://www.macaulaylibrary.org/","credit":"Cornell Lab — Macaulay Library","gallery":[{"imageUrl":"https://commons.wikimedia.org/wiki/Special:FilePath/Hippolais%20polyglotta%20song%20spectrogram.png?width=640","pageUrl":"https://commons.wikimedia.org/wiki/File:Hippolais%20polyglotta%20song%20spectrogram.png","credit":"鳥のさえずりのスペクトログラム — Wikimedia Commons / Public domain"}]},"essence":"音を時間×周波数×強度の面に写す可視化。鳥の声の研究からDTMの画面まで、「音の形」を見る標準となり、そこに絵を隠すアーティストまで現れた。","cues":["時間×周波数の面","強度の濃淡","声紋のパターン","隠し絵の遊び"],"intents":["技術","静けさ","遊び"],"works":["録音に混じった雑音や倍音を、耳ではなく目で特定するとき","音がどう変化するかを、時間に沿った一枚の図で説明するとき"],"recipe":{"type":"周波数軸は対数で取り、目盛と単位を必ず図の内側に置く","layout":"横に時間、縦に周波数を固定し、強度の凡例を脇に添える","material":"明度が単調に上がる配色を選び、虹色の階調は使わない"},"avoid":"窓幅を決めずに描くと時間と周波数の分解能が偏り、実在しない縞や滲みを音の特徴と読み違える","colors":["#e7e7e7","#8f8f8f","#3b3b3b"],"motif":"notation","pair":["cymatics","photomicrography"],"study":["ベル研の声紋研究","鳥類学のソノグラム","エイフェックス・ツインの隠し絵"],"en":{"essence":"A visualization that maps sound onto a plane of time, frequency and intensity. From birdsong research to the DAW screen it became the standard way to see the shape of a sound, and artists have since taken to hiding pictures inside it.","cues":["The time-frequency plane","Intensity as shading","Voiceprint patterns","Hidden-image play"],"works":["Locating noise or overtones in a recording by eye instead of ear","Explaining how a sound changes as a single figure along time"],"recipe":{"type":"A log frequency axis, scale and units printed inside the figure","layout":"Time across and frequency up, an intensity key alongside","material":"A colormap rising monotonically in lightness, never rainbow"},"avoid":"Drawing without choosing a window length skews the tradeoff between time and frequency resolution, and artifacts get read as real features.","study":["Bell Labs voiceprint research","ornithology's sonograms","Aphex Twin's hidden faces"]},"links":{"page":"https://indexstyle.org/styles/spectrogram","json":"https://indexstyle.org/api/styles/spectrogram","designSpec":"https://indexstyle.org/styles/spectrogram/design.md","imagePrompt":"https://indexstyle.org/styles/spectrogram/prompt.txt"},"usage":{"license":"CC-BY-4.0","licenseName":"Creative Commons Attribution 4.0 International","licenseUrl":"https://creativecommons.org/licenses/by/4.0/","attribution":"IndexStyle — https://indexstyle.org","attributionUrl":"https://indexstyle.org","scope":"Original IndexStyle text and structured data. Reference images, quoted works, and third-party material are excluded and retain their own rights."}}