A spectral envelope is a curve in the frequency-amplitude plane, derived from a Fourier magnitude spectrum. It describes one point in time (one window, to be precise).
||This article relies largely or entirely upon a single source. (December 2010)
In remote sensing using a spectrometer, the spectral envelope of a feature is the boundary of its spectral properties, as defined by the range of brightness levels in each of the spectral bands of interest.
- Swartz, Diemo (1998). "Spectral Envelopes". .