Discriminating between stationary and non-stationary signals

摘要

Signal frames containing background sounds in a mobile radio communication system are tested for stationarity. Consecutive measures DELTA En representing spectral changes in said signals from frame to frame are formed. From these measures a second measure of the rate of spectral change are formed. Finally, it is determined whether this second measure exceeds a predetermined stationarity limit gamma . If this is the case the signals are considered stationary.