Discriminating between stationary and non-stationary signals

Details Discriminating between stationary and non-stationary signals Discriminating between stationary and non-stationary signals

H - Electricity

04

B

H04B 17/00 (2006.01) G10L 21/02 (2006.01) H04Q 7/34 (2006.01)

Patent

CA 2139628

A discriminator discriminates between stationary and non-stationary signals. The energy E(T1) of the input signal is calculated in a number of windows Ti. These energy values are stored in a buffer, and from these stored values a test variable VT is calculated. This test variable comprises the ratio between the maximum energy value and the minimum energy value in the buffer. Finally, the test variable is tested against a stationary limit .gamma.. If the test variable exceeds this limit the input signal is considered non-stationary. This discrimination is especially useful for discriminating between stationary and non-stationary background sounds in a mobile radio communication system.

Un discriminateur (24) effectue une discrimination entre des signaux stationnaires et non stationnaires. L'énergie E(Ti) du signal d'entrée est calculée dans un certain nombre de fenêtres Ti. Ces valeurs d'énergie sont stockées dans une mémoire tampon (52) et une variable de test VT est calculée (54) à partir de ces valeurs stockées. Cette variable de test comprend le rapport entre la valeur d'énergie maximale et la valeur d'énergie minimale dans la mémoire tampon. Enfin, la variable de test est testée par rapport à une limite stationnaire gamma . Si cette variable de test dépasse cette limite, le signal d'entrée est considéré comme non stationnaire. Cette discrimination est particulièrement utile pour effectuer une discrimination entre les bruits de fond stationnaires et non stationnaires dans les systèmes mobiles de radio communication.

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