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IEVref:702-04-54ID:
Language:enStatus: Standard
Term: amplitude, <of a signal>
Synonym1: envelope, <of a signal>
[Preferred]
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Definition: modulus A(t) of the analytic signal corresponding to the real signal f(t), written in the form:

f (t) + j g (t) = A (t) ejφ(t)

NOTE – When a modulated signal is represented by E(t)cos[2πft + θ(τ)] in which f is substantially larger than the highest frequency of any significant spectral component of the modulating signal, the envelope is approximately represented by the curve y = E(t).


Publication date:1992-03
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Internal notes:2019-08-08: Editorial corrections: replacement of () in specific use; deletion leading article; correction of the imaginary unit in the exponent from "i" to "j"; presentation "f", "g", "A", "\phi" and "E" in italics; addition of a cross-reference to "analytic signal [IEV 702-04-52]"; correction of spelling of "enveloppe". Validated with Erik Jacobson. JGO
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