Bridge-tap equalizer method and apparatus

Details Bridge-tap equalizer method and apparatus Bridge-tap equalizer method and apparatus

H - Electricity

04

B

H04B 3/04 (2006.01) H03G 5/02 (2006.01) H04B 3/08 (2006.01) H04M 7/00 (2006.01)

Patent

CA 2140359

An equalizer (100) is suitable for removing the delay distortion from a switched digital signal received from a telephone channel where the delay distortion is caused by a bridge-tap connected to the telephone channel. The equalizer includes a feedback delay circuit (200) which is arranged to delay the output signal (150) by an amount of time based on the square of the predominant frequency of the output signal. The resulting delayed feedback signal (130) is then combined with the input signal, thereby compensating for the delay distortion. The equalizer also includes an amplifier (103) which may be adjusted to compensate to the attenuation distortion caused by the bridge tap.

Un égaliseur (100) convient pour éliminer une distorsion de retard d'un signal numérique commuté reçu à partir d'une voie téléphonique, lorsque cette distorsion est produite par un point de raccordement connecté à la voie téléphonique. L'égaliseur comprend un circuit (200) de retard à retour, conçu pour retarder le signal de sortie (150) d'une durée basée sur le carré de la fréquence prédominante du signal de sortie. Le signal de retour (130) retardé ainsi obtenu est alors combiné au signal d'entrée, ce qui permet de compenser la distorsion de retard. L'égaliseur comprend également un amplificateur (103) qui peut être ajusté afin de compenser la distorsion d'affaiblissement causée par le point de raccordement.

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