In astrophysics and planetary science, spectral slope, also called spectral gradient, is a measure of dependence of the reflectance on the wavelength.
In digital signal processing, it is a measure of how quickly the spectrum of an audio sound tails off towards the high frequencies, calculated using a linear regression.[1]
- ^ G. Peeters, A large set of audio features for sound description, tech. rep., IRCAM, 2004.