Digital virtual earth active cancellation system

G - Physics – 10 – K

Patent

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Details

G10K 11/178 (2006.01) G06F 17/10 (2006.01) H03H 21/00 (2006.01) H04B 15/00 (2006.01)

Patent

CA 2076007

A digital virtual earth active cancellation system (14) which receives a phenomena input signal (r) representing residual phenomena to be cancelled and has an adaptive filter (44) which generates a cancellation signal (y). A system impulse response (c) is convolved with the cancellation signal (y) and is subtracted from the input signal (r) to produce an estimate of noise (x). The adaptive filter (44) produces the cancellation signal (y) by filtering the estimated noise (x) with a filter weight (a) that is adapted by the system impulse response (c). By convolving the estimate of noise (x) with the system impulse (c) to adapt the filter (44), the values sent to an adapter (50) for the adaptive filter (44) are kept within 90° phase of the residual signal (r). This substantially eliminates the problems associated with destructive feedback due to phase shifts without the need for external reference signals.

Système numérique virtuel d'annulation active de terre (14). Le système reçoit un signal d'entrée (r) représentant des phénomènes résiduels à annuler, et est doté d'un filtre adaptatif (44) qui produit un signal d'annulation (y). Une réponse impulsionnelle du système (c) est convolutionnée avec le signal d'annulation (y) et soustraite du signal d'entrée (r) afin de produire une estimation de bruit (x). Le filtre adaptatif (44) produit le signal d'annulation (y) en filtrant le bruit estimé (x) avec un poids de filtre (a) adapté par la réponse impulsionnelle (c) du système. En convolutionnant l'estimation du bruit (x) avec l'impulsion du système (c) afin d'adapter le filtre (44), on peut conserver les valeurs envoyées à un adapteur (50) pour le filtre adaptatif (44) avec un déphasage d'au plus 90 degrés du signal résiduel (r). Cela élimine en bonne partie les problèmes associés à la rétroaction destructive due à des déphasages sans nécessiter le recours à des signaux de référence externes.

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