The measure of something's size, especially in terms of width or breadth; largeness, magnitude.

plural of amplitude

Relating to amplitude

(radio) A method of sending information by modifying (modulating) the intensity (amplitude) of a carrier wave.

(physics) The analysis of the energy level structure of a quantum system through its response to driving-field amplitude rather than frequency

plural of amplitude modulation

(quantum mechanics) A complex number which is the coefficient of a component of a quantum state and whose product with its own complex conjugate gives the probability that the state will collapse to that component (when measured). (Note: the quantum state being thought of as a linear combination of its components.)

plural of probability amplitude

plural of quadrature amplitude modulation

(radio) A modulation scheme that conveys data by applying amplitude modulation to two carrier waves at once. These two waves, usually sinusoids, are out of phase with each other by 90° and are thus called quadrature carriers. Commonly abbreviated QAM.