The amplitude of a periodic variable is a measure of its change over a single period (such as time or spatial period). There are various definitions of amplitude (see below), which are all functions of the magnitude of the difference between the variable's extreme values.

In older texts the phase is sometimes confusingly called the amplitude.

Read more about Amplitude:  Formal Representation, Waveform and Envelope

Other articles related to "amplitude, amplitudes":

Sinusoidal Model - Good Starting Values For Amplitude
... A complex demodulation amplitude plot can be used to find a good starting value for the amplitude ... In addition, this plot can indicate whether or not the amplitude is constant over the entire range of the data or if it varies ... zero slope, then it is reasonable to assume a constant amplitude in the non-linear model ...
Amplitude And Phase-shift Keying
... Amplitude and Phase-shift keying or Asymmetric Phase-shift keying, (APSK), is a digital modulation scheme that conveys data by changing, or modulating, both the amplitude and ... In other words, it combines both Amplitude-shift keying (ASK) and Phase-shift keying (PSK) to increase the symbol-set ... It can be considered as a superclass of Quadrature amplitude modulation (QAM) ...
Amplitude - Waveform and Envelope
... The amplitude may be constant (in which case the wave is a continuous wave) or may vary with time and/or position ... The form of the variation of amplitude is called the envelope of the wave ... between peak-to-peak, peak, mean, and RMS amplitudes are fixed and known, as they are for any continuous periodic wave ...
Low-threshold Spikes - Research - Amplitude of The Ca2+ Spike
... The amplitude of LTS has been shown to directly correlate with the size of the transient Ca2+ current that underlies the LTS in certain neuronal cells ... The amplitude of the Ca2+ spike is therefore predominantly dependent on the level of preceding membrane hyperpolarization and the depolarizing input ... that follow them, LTS vary little in amplitude or shape at different holding potentials ...
Stokes' Law (sound Attenuation) - Interpretation
... Consider a plane sinusoidal pressure wave that has amplitude at some point ... After traveling a distance from that point, its amplitude will be The parameter is dimensionaly the reciprocal of length ... That is, if, the wave's amplitude decreases by a factor of for each meter traveled ...

Famous quotes containing the word amplitude:

    Imagination, which in truth
    Is but another name for absolute power
    And clearest insight, amplitude of mind,
    And reason, in her most exalted mood.
    William Wordsworth (1770–1850)