Fast training echo canceller

H - Electricity – 04 – B

Patent

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340/72

H04B 3/20 (2006.01) H04B 3/23 (2006.01)

Patent

CA 2013797

An echo cancellation modem having a fast training echo canceller in which the echo cancellation coefficients are computed by taking correlations between a complex, periodic training signal sequence and a real component of the corresponding echo signal. The modem includes a receiver circuit for detecting a signal on a channel possibly including an echo; an echo canceller for estimating the real component of the echo signal; training circuitry for applying the complex training sequence to the channel and for taking correlations between the training sequence and the real component of the corresponding echo signal. The modem also includes a computational element for computing the period of the periodic sequence, generating the complex periodic train sequence in real time and for computing a phase roll frequency based upon the computed echo cancellation coefficients.

Modem à annulation d'écho ayant un annulateur d'écho à conditionnement rapide, dans lequel le calcul des coefficients d'annulation d'écho s'appuie sur des corrélations entre une séquence de signaux de conditionnement périodique complexe et une composante réelle du signal d'écho correspondant. Le modem comprend un circuit récepteur pour détecter un signal sur un canal où un écho peut être présent; un annulateur d'écho pour estimer la composante réelle du signal d'écho; des circuits de conditionnement pour appliquer au canal la séquence de conditionnement complexe et pour établir les corrélations entre la séquence de conditionnement et la composante réelle du signal d'écho correspondant. En outre, le modem comprend un élément de calcul pour calculer la période de la séquence périodique, produire en temps réel la séquence de conditionnement périodique complexe et calculer une fréquence de roulement de phase basée sur les coefficients d'annulation d'écho calculés.

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