Patent ID: 6195384
Filing Date: 2001-02-27
Classification: H04B,H04L

Abstract:
A digital modem adapted to communicate with an analog modem via a digital network that inserts a selectable loss in the amplitude levels of .mu.-law encoded signals transmitted from the digital modem, with the digital modem having a .mu.-law encoder and decoder for signals transmitted and received by the digital modem, respectively, and with the digital modem comprising:means for receiving from the analog modem a control signal for detecting the amount of digital loss inserted by the digital network in signals transmitted from the digital modem to the analog modem; andan inversion mapper that maps a first .mu.-law encoded signal into a second .mu.-law encoded signal prior to its transmission to the analog modem to scale the amplitude level of the first .mu.-law encoded signal by an inversion factor corresponding to the detected amount of the loss inserted by the digital network.