Amplitudet

Amplitudet is a neologism that appears in some contemporary discussions of oscillatory phenomena and signal processing. It is not a standard term in established reference works, and its precise meaning varies between sources.

In several interpretations, amplitudet denotes a measure related to the amplitude of an oscillatory component. One approach treats it as the instantaneous rate of change of the signal’s envelope, for a modulated form such as s(t) = A(t) cos(ω0 t + φ(t)). Under this view, amplitudet corresponds to the time derivative of the envelope magnitude, d|A(t)|/dt. A second usage defines amplitudet as the instantaneous amplitude itself, the envelope magnitude |A(t)|. A third view describes amplitudet as a composite scalar intended to reflect both amplitude and its temporal variation, without prescribing a single standard formula.

Origin and usage: The term appears mainly in informal writings, blogs, forums, and some fictional works, rather than in standard technical references. It is used to discuss how amplitude evolves in time, especially in nonstationary or noisy contexts.

Relation to established concepts: Amplitudet relates to instantaneous amplitude, envelope detection, the analytic signal, and modulation metrics. Because there is no universal definition, readers should consult the explicit definition given in each source to understand what is meant by amplitudet in that context.

See also: amplitude, envelope, analytic signal, Hilbert transform.