W. Etter et Gs. Moschytz, NOISE-REDUCTION BY NOISE-ADAPTIVE SPECTRAL MAGNITUDE EXPANSION, Journal of the Audio Engineering Society, 42(5), 1994, pp. 341-349
Noise-adaptive spectral magnitude expansion bridges the gap between co
mpandors used to overcome the limited dynamic range of a transmission
channel and noise suppression techniques such as spectral subtraction
or spectral short-time Wiener filtering. The underlying idea of noise-
adaptive spectral magnitude expansion is to adapt the crossover point
of the spectral magnitude expansion in each frequency channel based on
the noise level. When no restrictions are imposed on the expansion ch
aracteristic, many types of spectral short-time filtering, such as spe
ctral subtraction and spectral short-time Wiener filtering, can be con
sidered as special cases of noise-adaptive spectral magnitude expansio
n.