H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
H04Q 7/20 (2006.01) G10L 11/02 (2006.01) G10L 19/00 (2006.01) H04L 27/00 (2006.01) G10L 9/14 (1995.01)
Patent
CA 2151398
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 (50, 52, 54, 56, 58). From these measures a second measure (M) of the rate of spectral change are formed (60, 62). Finally it is determined whether this second measure (M) exceeds a predetermined stationarity limit .gamma.. If this is the case the signals are considered stationary.
Dans un système mobile de radiocommunications, des blocs de signaux contenant des bruits de fond sont l'objet de tests de détection quant à leur nature stationnaire. On procède à des mesures consécutives .DELTA.E¿n? représentatives des modifications de spectre des signaux d'un bloc à l'autre (50, 52, 54, 56, 58), dont on tire une deuxième mesure (M) du taux de modification de spectre (60, 62). On détermine ensuite si cette deuxième mesure (M) dépasse une limite prédéterminée .gamma. d'état stationnaire, et si tel est le cas, on considère les signaux comme stationnaires.
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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