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7 statements · 14% with external sources · numbers in brackets are citations
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4 identifiers linking envelope across the web's reference databases
7 statements · 14% with external sources · numbers in brackets are citations
4 identifiers linking envelope across the web's reference databases
From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0
In physics and engineering, the envelope of an oscillating signal is a smooth curve outlining its extremes. The envelope thus generalizes the concept of a constant amplitude into an instantaneous amplitude. The figure illustrates a modulated sine wave varying between an upper envelope and a lower envelope. The envelope function may be a function of time, space, angle, or indeed of any variable.