H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 3/40 (2006.01) H04M 1/76 (2006.01)
Patent
CA 2281772
The invention relates to a method and to a device for automatically matching the levels of the signals exchanged in a telephone network, between a first apparatus and a second apparatus. The method according to the invention comprises the following steps: - the signal (OUT2) which comes from the transmission line (6) and is received by the first apparatus (2) is digitized, - on the basis of the digital data representing the signals (IN1, OUT2) exchanged with the transmission line (6), an estimate is made of the transfer function (K) equal to the ratio of the signal (OUT2) received by the first apparatus to the signal (IN1) transmitted by the first apparatus, - each of the exchanged signals (IN1, OUT2) is respectively multiplied by a suitable gain (G1, G2) determined on the basis of the estimated value of the said transfer function (K). Particular application to telephones, video- phones, faxes or computers which are connected to a communication network.
L'invention concerne un procédé et un dispositif d'adaptation automatique des niveaux des signaux échangés dans un réseau téléphonique, entre un premier appareil et un second appareil. Le procédé selon l'invention comprend les étapes suivantes: on réalise une numérisation du signal (OUT2) provenant de la ligne de transmission (6) et reçu par le premier appareil (2); à partir des données numériques traduisant les signaux échangés (IN1, OUT2) avec la ligne de transmission (6), on réalise une estimation de la fonction de transfert (K) égale au rapport du signal reçu (OUT2) par le premier appareil sur le signal émis (IN1) par le premier appareil; on multiplie respectivement chacun des signaux échangés (IN1, OUT2) par un gain approprié (G1, G2) déterminé à partir de la valeur estimée de ladite fonction de transfert (K). Application particulière aux téléphones, vidéophones, fax ou ordinateurs reliés à un réseau de communication.
Fetherstonhaugh & Co.
Thomson Multimedia
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