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Quadrature may refer to: In signal processing: *Quadrature amplitude modulation (QAM), a modulation method of using both an (in-phase) carrier wave and a 'quadrature' carrier wave that is 90° out of phase with the main, or in-phase, carrier *Quadrature phase, oscillations that are said to be ''in quadrature'' if they are separated in phase by 90° (π/2, or λ/4) *Quadrature filter, the analytic signal of a real-valued filter *Quadrature phase-shift keying (QPSK), a phase-shift keying of using four quadrate points on the constellation diagram, equispaced around a circle In mathematics: * Quadrature (mathematics), drawing a square with the same area as a given plane figure (''squaring'') or computing that area * Numerical integration is often called 'numerical quadrature' or simply 'quadrature' * Gaussian quadrature, a special case of numerical integration * Formerly, a synonym for "integral" * * Integral * * Antiderivative In physics: * In Optical phase space, quadratures are operators which represent the real and imaginary parts of the complex amplitude; see also in-phase and quadrature components In astronomy: * Quadrature (astronomy), the position of a body (moon or planet) such that its elongation is 90° or 270°; i.e. the body-earth-sun angle is 90° Quadrature may also refer to: *In motion control, ''quadrature encoder'' is a rotary encoder or linear encoder giving both the relative position and the direction of motion of a shaft 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「Quadrature」の詳細全文を読む スポンサード リンク
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