WordNet

(computer science) the area of the screen in graphical user interfaces against which icons and windows appear (同)desktop, screen background
a persons social heritage: previous experience or training; "he is a lawyer with a sports background"
understate the importance or quality of; "he played down his royal ancestry" (同)play down, downplay
information that is essential to understanding a situation or problem; "the embassy filled him in on the background of the incident" (同)background knowledge
extraneous signals that can be confused with the phenomenon to be observed or measured; "they got a bad connection and could hardly hear one another over the background signals" (同)background signal
the part of a scene (or picture) that lies behind objects in the foreground; "he posed her against a background of rolling hills" (同)ground
relatively unimportant or inconspicuous accompanying situation; "when the rain came he could hear the sound of thunder in the background"

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中山雅人,英慎平,中迫昇 [他],篠原寿広,上保徹志
電子情報通信学会論文誌. A, 基礎・境界 J94-A(8), 676-679, 2011-08-01
我々はこれまで,可聴音域に拡張した送信波と反射波の位相干渉に基づく近距離推定法について検討してきた.本研究では,対象物のある環境とない環境での同期収録信号をスペクトル減算することで,バックグラウンド要素を除去する音響測距法を検討する.
NAID 110008687319