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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Phase (waves) ： ウィキペディア英語版 Phase (waves) Phase in sinusoidal functions or in waves has two different, but closely related, meanings. One is the initial angle of a sinusoidal function at its origin and is sometimes called phase offset or phase difference. Another usage is the fraction of the wave cycle that has elapsed relative to the origin. ==Formula== The phase of an oscillation or wave refers to a sinusoidal function such as the following: :$\backslash begin$ x(t) &= A\cdot \cos( 2 \pi f t + \varphi ) \\ y(t) &= A\cdot \sin( 2 \pi f t + \varphi ) = A\cdot \cos\left( 2 \pi f t + \varphi - \tfrac\right) \end where $\backslash scriptstyle\; A\backslash ,$, $\backslash scriptstyle\; f\backslash ,$, and $\backslash scriptstyle\; \backslash varphi\backslash ,$ are constant parameters called the ''amplitude'', ''frequency'', and ''phase'' of the sinusoid. These functions are periodic with period $\backslash scriptstyle\; T\; =\; \backslash frac\backslash ,$, and they are identical except for a displacement of $\backslash scriptstyle\; \backslash frac\backslash ,$ along the $\backslash scriptstyle\; t\backslash ,$ axis. The term phase can refer to several different things: * It can refer to a specified reference, such as $\backslash scriptstyle\; \backslash cos(\; 2\; \backslash pi\; f\; t)\backslash ,$, in which case we would say the phase of $\backslash scriptstyle\; x(t)\backslash ,$ is $\backslash scriptstyle\; \backslash varphi\backslash ,$, and the phase of $\backslash scriptstyle\; y(t)\backslash ,$ is $\backslash scriptstyle\; \backslash varphi\backslash ,-\backslash ,\; \backslash frac\backslash ,$. * It can refer to $\backslash scriptstyle\; \backslash varphi\backslash ,$, in which case we would say $\backslash scriptstyle\; x(t)\backslash ,$ and $\backslash scriptstyle\; y(t)\backslash ,$ have the same phase but are relative to their own specific references. * In the context of communication waveforms, the time-variant angle $\backslash scriptstyle\; 2\; \backslash pi\; f\; t\; \backslash ,+\backslash ,\; \backslash varphi$, or its principal value, is referred to as instantaneous phase, often just phase. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Phase (waves)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.