Echo canceller employing dual-h architecture having split...

Details Echo canceller employing dual-h architecture having split... Echo canceller employing dual-h architecture having split...

H - Electricity

04

B

H04B 3/23 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2307678

An echo canceller circuit (25) is set forth. The echo canceller circuit (25) includes a digital filter (30) having adaptive tap coefficients to simulate an echo response occurring during a call. The adaptive tap coefficients are updated during the call using a Mean Squares process. A tap energy detector is also employed. The tap energy detector identifies and divides groups of taps having high energy from groups of taps having low energy. The high energy tap groups are larger in number than the low energy tap groups. The high energy tap groups are adapted separately from the low energy tap groups using the Least Squares process. Still further, the high energy tap groups may be adapted using an adaptive gain constant a while the low adaptive energy tap groups are adapted using an adaptive gain constant a', wherein a > a'.

L'invention concerne un circuit annuleur d'écho (25) qui inclut un filtre numérique (30) ayant des coefficients de prises adaptatives pour simuler une réponse en écho survenant pendant un appel. Lesdits coefficients de prises adaptatives sont mises à jour pendant l'appel par un procédé à moyenne quadratique. On met également en oeuvre un détecteur d'énergie multi-prises qui identifie et sépare des groupes de prises haute énergie de groupes de prises basse énergie. Les groupes de prises haute énergie sont plus nombreux que les groupes de prises basse énergie et sont adaptés séparément de ces derniers au moyen dudit procédé à moyenne quadratique. En outre, les groupes de prises haute énergie peuvent être adaptés au moyen d'une constante de gain adaptif a et les groupes de prises adaptatives basse énergie peuvent être adaptés au moyen d'une constante de gain adaptatif a', a étant supérieur à a'.

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