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Amplitude: The amplitude of a periodic variable is a measure of its change in a single period . There are various definitions of amplitude (see below), which are all functions of the magnitude of the differences between the variable's extreme values.
Amplitude modulation: Amplitude modulation is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio carrier wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to that of the message signal, such as an audio signal.
Amplitude-shift keying: Amplitude-shift keying is a form of amplitude modulation that represents digital data as variations in the amplitude of a carrier wave. In an ASK system, the binary symbol 1 is represented by transmitting a fixed-amplitude carrier wave and fixed frequency for a bit duration of T seconds.
Amplitude (video game): Amplitude is a music video game developed by Harmonix for the PlayStation 2. It is the sequel to Frequency.
Amplitude versus offset: In geophysics and reflection seismology, amplitude versus offset or amplitude variation with offset is the general term for referring to the dependency of the seismic attribute, amplitude, with the distance between the source and receiver (the offset). AVO analysis is a technique that geophysicists can execute on seismic data to determine a rock's fluid content, porosity, density or seismic velocity, shear wave information, fluid indicators (hydrocarbon indications).The phenomenon is based on the relationship between the reflection coefficient and the angle of incidence and has been understood since the early 20th century when Karl Zoeppritz wrote down the Zoeppritz equations.