Pcm modem adaptation system utilizing a silence period

Details Pcm modem adaptation system utilizing a silence period Pcm modem adaptation system utilizing a silence period

H - Electricity

04

B

H04B 1/38 (2006.01) H04B 14/04 (2006.01) H04L 5/14 (2006.01) H04L 25/49 (2006.01)

Patent

CA 2398484

In a full duplex PCM modem system (figure 2), a method and apparatus is provided for robust measuring of the communications channel (67) in which the digital modem (26) transmitter is silenced (54) during generation of training signal by analog modem (12), with silencing of the digital modem's transmitter eliminating problems associated with echo during channel measurement at the digital modem. The above method thus eliminates echo during channel estimation and removes any dependencies on the performance of the echo canceller normally used.

L'invention porte sur un système de modems MIC fonctionnant en duplex pur et sur un procédé et un appareil mesurant de manière sure le canal de communication (67) alors que l'émetteur du modem numérique (26) est rendu silencieux (54) pendant la production du signal d'égalisation par le modem analogique (12), ce silence éliminant les problèmes liés à l'écho pendant la mesure du canal par le modem numérique. Ledit procédé élimine les échos lors de l'estimation des canaux, et toute dépendance des performances de l'annuleur d'échos normalement utilisé.

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