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2Â¥: Originally posted by sspa9999 at 2020-03-10 02:19:32
ËÆºõÊÇÒ»¸ö¶«Î÷£ºIn?physics, the?slowly varying envelope approximation?(SVEA, sometimes also called?slowly varying amplitude approximation?or?SVAA) is the assumption that the?envelope?of a forward-tra ...

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ËÆºõÊÇÒ»¸ö¶«Î÷£ºIn?physics, the?slowly varying envelope approximation[1]?(SVEA, sometimes also called?slowly varying amplitude approximation?or?SVAA) is the assumption that the?envelope?of a forward-travelling?wave?pulse varies slowly in time and space compared to a?period?or?wavelength. This requires the?spectrum?of the signal to be?narrow-banded¡ªhence it also referred to as the?narrow-band approximation.

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