Use Wikipedia with dynamical search help in all languages ...

Look up in Wiktionary, the free dictionary.quadrature |

**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"
- Addition in quadrature, combining the magnitude of uncorrelated signals by taking the square root of the sum of their squares

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°

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

This page is funded by cryptomining