Quadrature

See: Quadrature Amplitude Modulation, Quadrature Phase, Quadrature Filter, Quadrature Phase-Shift Keying, Quadrature (Mathematics), Numerical Quadrature Integration, Gaussian Quadrature, Antiderivative, Optical Phase Space Quadrature.

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References

2017

• (Wikipedia, 2017) ⇒ https://en.wikipedia.org/wiki/quadrature Retrieved:2017-9-16.
  • 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
    • Illusionistic ceiling painting, sometimes called quadrature after the Italian term, quadratura

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