Quadrature Explained
Quadrature may refer to:
In signal processing:
- Quadrature phase, oscillations that are said to be in quadrature if they are separated in phase by 90° (/2, or /4)
- Quadrature component of a composite signal
- Quadrature filter, the analytic signal of a real-valued filter
- 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-shift keying (QPSK), a phase-shift keying of using four quadrate points on the constellation diagram, equispaced around a circle
In mathematics:
- Quadrature (geometry), 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"
- Quadrature (differential equations), expressing a differential equation solution in terms of integrals.
- Formerly, a synonym for "integral"
- Addition in quadrature, combining the magnitude of uncorrelated signals by taking the square root of the sum of their squares
In physics:
- Optical phase space quadratures, operators which represent the real and imaginary parts of the complex amplitude
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°
In Hedge-funds:
- Quadrature (hedge-fund), the quant hedge-fund created in 2010, in London, England.
Quadrature may also refer to:
- Quadrature encoder, a device that detects mechanical position changes and direction of movement
- Illusionistic ceiling painting, sometimes called quadrature after the Italian term, quadratura
- La Quadrature du Net (Squaring of the Net in French), a French advocacy group that promotes digital rights and freedoms of citizens
- "Quadrature", a song by Squarepusher from the album Just a Souvenir
